Shandong Jiurunfa Chemical Technology Co., Ltd.

Zinc oxide

First, Basic Information 1. Chemical Formula and English Name: Chemical formula is ZnO; English name is Zinc oxide. 2. Synonyms: Zinc oxide powder, zinc white, zinc white powder, zinc blende, subblende, zinc white silver, zinc monoxide, smithsonite, etc. 3. CAS Number: 1314-13-2. Second, Physical Properties 1. Appearance: At room temperature, it appears as white hexagonal crystalline crystals or powder, odorless, with a fine texture. 2. Melting Point and Boiling Point: Melting point is 1975°C, boiling point reaches 2360°C. 3. Density: Relative density (water = 1) is 5.606. 4. Solubility: Sparingly soluble in water and ethanol; soluble in acids, sodium hydroxide solution, and ammonium chloride solution. Classified as an amphoteric oxide. 5. Refractive Index: 2.008 - 2.029. Third, Chemical Properties 1. Stability: Chemically stable, but absorbs carbon dioxide and water in air to form zinc carbonate. It turns yellow when heated but reverts to white upon cooling. 2. Acid-Base Properties: Amphoteric; reacts with acids to form salts and water (e.g., reacts with hydrochloric acid to produce zinc chloride and water) and with strong bases to form zincates and water (e.g., reacts with sodium hydroxide to produce sodium zincate and water). Fourth, Primary Applications 1. Rubber Industry: An essential additive in rubber manufacturing, serving as a reinforcing agent and activator to enhance rubber's abrasion resistance, tear resistance, and tensile strength. Also functions as a whitening agent for white rubber compounds. 2. Coatings Industry: Used as a pigment in paints, offering excellent hiding power and weather resistance. Improves coatings' corrosion resistance and anti-chalking properties. 3. Pharmaceutical Industry: Commonly used in ointments, zinc paste, and adhesive plasters for its astringent, antiseptic, and skin-protective properties. Also serves as a pharmaceutical excipient, functioning as a filler and antimicrobial agent. 4. Electronics Industry: Applied in semiconductor products such as liquid crystal displays, thin-film transistors, and light-emitting diodes. Microparticulate zinc oxide, as a nanomaterial, also plays a role in related electronic fields. 5. Cosmetics Industry: A key ingredient in sunscreen products, it absorbs and scatters ultraviolet rays to provide sun protection while causing minimal skin irritation. 6. Other Applications: Used for desulfurization in synthetic ammonia, petroleum, and natural gas chemical feedstocks; as a zinc supplement in feed processing; and as a matrix for analytical reagents, reference standards, fluorescent agents, and photosensitive materials. Fifth, Safety 1. Health Hazards: Inhalation of zinc oxide fumes may cause zinc foundry fever, presenting symptoms such as metallic taste in the mouth, thirst, dry throat, loss of appetite, chest tightness, dry cough, headache, dizziness, limb soreness, high fever, and chills. Large-scale ingestion may lead to gastrointestinal discomfort including nausea, vomiting, abdominal pain, and diarrhea. 2. Protective Measures: Operators should wear self-filtering dust masks, chemical safety goggles, impervious work clothing, and rubber gloves. Maintain good ventilation in work areas to minimize dust generation. Handle materials gently during transport to prevent damage to packaging and containers. Shandong Jiurunfa Chemical Technology Co., Ltd. is an energy and chemical enterprise engaged in the research, development, production, sales and service of industrial gases, special gases, mixed gases and chemical products. If you need Zinc oxide, please contact us.     Zinc oxide cas Zinc oxide ointment

Dimethyl ether

First, Basic Information about dimethyl ether1. CAS Number: 115-10-6.2. Appearance and Odor: At standard temperature and pressure, it is a colorless gas with a faint ether-like odor.Second, Physical Properties1. State and Boiling Point: Gaseous at room temperature with a low boiling point of approximately -24.9°C. This allows it to liquefy under slight pressure, facilitating storage and transportation.2. Solubility: Exhibits excellent miscibility, dissolving in most polar and nonpolar organic solvents such as water, ethanol, diethyl ether, acetone, and chloroform.3. Density: Relative density (water = 1) is 0.67; relative vapor density (air = 1) is 1.62.Third, Chemical Properties1. Stability: Generally chemically stable under normal conditions, but non-corrosive to metals.2. Flammability: Highly flammable. Forms explosive mixtures with air within a concentration range of 3.4%–27% (by volume). Ignites or explodes readily upon contact with open flames or intense heat. Burns with a slightly luminous flame, producing carbon dioxide and water upon complete combustion.3. Oxidation Reactions: Under certain conditions, it can be oxidized. For example, with a catalyst, it can be oxidized by air to produce formaldehyde and other products.Fourth, Primary Applications1. Energy SectorLiquefied Petroleum Gas (LPG) Substitute: Dimethyl ether has combustion properties similar to LPG but burns more completely and cleanly, making it suitable as a residential fuel. It can be used alone or blended with LPG, natural gas, and other fuels.Automotive Fuel: With a high cetane number, dimethyl ether serves as an alternative diesel fuel. Its use in vehicles reduces engine nitrogen oxide and particulate emissions, contributing to improved air quality.2. Chemical IndustryAerosol Propellant: Due to its excellent solubility and low toxicity, it can replace traditional aerosol propellants like Freon in products such as hair spray, air fresheners, and insecticides.Solvent: It serves as a solvent in industries like coatings, inks, and adhesives, dissolving certain hard-to-dissolve organic compounds.Chemical Raw Material: It serves as a key feedstock for producing various chemical products, such as synthesizing low-carbon olefins, formaldehyde, and methyl acetate.Fifth, Safety Precautions1. Storage and Transportation: Store in a cool, well-ventilated, dedicated flammable gas warehouse, away from ignition sources and heat. Warehouse temperature should not exceed 30°C. Keep separate from oxidizers, acids, halogens, and other incompatible substances; never store together. When transporting in cylinders, ensure cylinder caps are securely fastened. Cylinders should generally be laid horizontally with all openings facing the same direction; do not stack crosswise. Height must not exceed the vehicle's guardrails, and cylinders should be secured with wedges to prevent rolling.2. Usage and Operation: Operators must undergo specialized training and strictly adhere to operating procedures. It is recommended that operators wear self-filtering respirators (half masks), chemical safety goggles, anti-static work clothing, and chemical-resistant gloves. Keep away from ignition sources and heat. Smoking is strictly prohibited in the workplace. Use explosion-proof ventilation systems and equipment. Prevent gas leakage into the workplace air. Avoid contact with oxidizers, acids, and halogens. During transport, cylinders and containers must be grounded and bonded to prevent static electricity. Handle with care during loading and unloading to prevent damage to cylinders and accessories. Dimethyl sulfideDiethylene glycol dimethyl ether

Hydroxypropyl methyl cellulose

In numerous fields of industrial production and daily life, there exists a seemingly ordinary yet critically important polymer compound—Hydroxypropyl methyl cellulose (HPMC). Derived from chemically modified natural cellulose, it has quietly permeated multiple industries including building materials, food, pharmaceuticals, and daily chemicals, thanks to its outstanding properties such as thickening, water retention, bonding, and film-forming capabilities.In the building materials industry, hydroxypropyl methylcellulose serves as the “core modifier” for various mortars and coatings. Take tile adhesive, commonly used in home renovations, as an example. Adding HPMC significantly enhances the mortar's water retention properties, preventing issues like weak tile bonding, hollow spots, or detachment caused by rapid moisture loss. Particularly in high-temperature or dry environments, the film formed by HPMC locks in moisture, providing ample time for the cement hydration reaction and ensuring construction quality. Simultaneously, it improves mortar flowability and workability, enabling smoother application by workers and reducing material waste. In interior and exterior wall coatings, HPMC's thickening effect ensures uniform texture, prevents pigment settling, delivers richer color saturation after application, enhances scrub resistance, and extends wall surface longevity.In the food industry, Hydroxypropyl methyl cellulose safeguards food quality as a “safe additive.” Approved nationally as a food thickener, stabilizer, and emulsifier, it is commonly used in products like yogurt, ice cream, and fruit juice beverages. During yogurt production, HPMC increases product viscosity for a smoother texture while preventing whey separation and extending shelf life. In ice cream production, it inhibits ice crystal growth, resulting in a finer texture that melts in the mouth. Furthermore, HPMC possesses excellent film-forming properties, creating a transparent coating on baked goods that effectively locks in moisture. This keeps bread and cakes soft and fluffy without altering their inherent flavor.In the pharmaceutical field, Hydroxypropyl methyl cellulose is an indispensable “excipient” in drug formulations. In tablet production, it serves as both a binder—adhering drug powders to form tablets with optimal hardness and uniform disintegration—and a coating material. The coating creates a protective layer that masks unpleasant drug odors while enabling sustained or controlled release. This allows drugs to dissolve slowly within the body, prolonging efficacy and reducing dosage frequency. In liquid formulations such as eye drops and ointments, HPMC regulates product viscosity, prolonging drug residence time on the ocular or skin surface to enhance absorption while reducing mucosal irritation. This improves both safety and comfort during administration.The personal care industry also relies on the benefits of Hydroxypropyl Methylcellulose. In toothpaste, it enhances viscosity, ensuring the paste holds its shape when dispensed without collapsing, while producing a finer lather during brushing. In skincare products like creams and lotions, HPMC serves as a thickening stabilizer, ensuring uniform texture and easy absorption upon application while locking in moisture to enhance hydration.With ongoing technological advancements, the application scope of Hydroxypropyl methyl cellulose continues to expand. From the preparation of new energy materials to the development of eco-friendly coatings, it demonstrates significant potential. However, different industries have varying requirements for HPMC's purity, viscosity, substitution degree, and other specifications, making the selection of high-quality products that meet industry standards crucial. In the future, with optimized production processes and innovations, Hydroxypropyl methyl cellulose will play a vital role in more fields with greater efficiency and environmental sustainability, injecting new momentum into industrial development and enhancing the quality of life. hydroxypropyl methylcellulose dangershydroxypropyl methylcellulose in supplementshydroxypropyl methylcellulose side effectsis hydroxypropyl methylcellulose safe to eathydroxypropyl methylcellulose in foodhydroxypropyl methylcellulose is it safehydroxypropyl cellulosehydroxypropyl methylcellulose ophthalmichydroxypropyl methylcellulose useshydroxypropyl methylcellulose solubility

Floor Paint: Safeguarding Every Step Ho

When we step into an indoor space, the floor is the first surface we encounter. A high-quality floor is not only an extension of visual aesthetics but also a vital safeguard for daily comfort and safety. Floor paint, as a modern flooring solution that combines practicality with beauty, is quietly transforming perceptions of floor decoration with its exceptional performance, infusing new vitality into both residential and commercial spaces. In home living scenarios, floor paint's wear resistance makes it a true household essential. Families with children often face floor scratches from dragging toys or moving furniture, while pet households must contend with claw marks. Premium floor paint utilizes high-hardness resin components. Professional testing confirms its surface wear resistance far exceeds traditional wood flooring. Daily friction leaves no visible marks, ensuring floors remain like new even after years of use. Simultaneously, its waterproof and moisture-resistant properties solve the challenges of damp floors during southern rainy seasons and cracking floors during northern dry seasons. It can be used without worry in humid areas like kitchens and bathrooms. Cleaning is effortless—simply wipe with a damp cloth to remove grease and water stains, eliminating the hassle of traditional floor maintenance. For users pursuing personalized decor styles, floor paint's color and texture options are like a “versatile artist.” Whether it's sleek light gray, warm and soothing milk tea tones, artistic vintage wood grain patterns, or industrial-chic concrete textures, floor paint delivers precise results. Professional installation teams can customize color schemes to match your space's aesthetic, even creating dimensional textures through multi-layer application. This transforms your floor from a plain backdrop into a focal point that elevates the room's ambiance. For instance, pairing matte light gray floor paint with natural wood furniture instantly brings a crisp, airy Nordic vibe to your living room. In a child's room, custom floor paint featuring cartoon patterns creates a playful, imaginative space for growth.​ Environmental friendliness is a core demand in modern home renovation, and floor paint excels in this area. Reputable brands strictly adhere to national environmental standards, utilizing formaldehyde-free, low-VOC formulations. After application, the space can be occupied after just a few days of ventilation, posing no health risks to sensitive groups like the elderly or children. Some premium products incorporate antimicrobial agents that effectively inhibit the growth of common bacteria like E. coli and Staphylococcus aureus, establishing an invisible barrier for household health. In commercial spaces, floor paint's advantages are even more pronounced. High-traffic areas like shopping malls and supermarkets require floors with exceptional load-bearing and wear-resistant properties—floor paint not only meets these demands but also enhances brand image through unified color schemes. In fitness centers and dance studios, anti-slip floor paint effectively reduces the risk of accidental falls, ensuring user safety. Offices adopting minimalist floor paint styles create a professional atmosphere while simplifying daily cleaning and maintenance. From homes to commercial spaces, blending functionality with aesthetics, floor paint emerges as the ideal choice for modern flooring solutions. It safeguards every step with safety and comfort while using color and texture to define unique aesthetic contours for any space. Choose premium floor paint to elevate your floors beyond ordinary, infusing both living and working environments with renewed brilliance.       best paint for flooring best painted flooring ideas beautiful painted floors ideas interior floor paint for wood best paint for kitchen floor most durable floor paint decorative floor painting ideas best paint for floor floor paint home depot painted floors photos

Water-based polyurethane resin

In an era where environmental awareness is increasingly ingrained and green manufacturing has become the core direction for industrial upgrading, a new material that combines high performance with eco-friendly attributes—water-based polyurethane resin—is rapidly disrupting the traditional materials market landscape. It is driving revolutionary changes across numerous industries.The greatest advantage of water-based polyurethane resin lies in its outstanding environmental performance. Using water as the dispersion medium and containing no or minimal volatile organic compounds, it eliminates harmful gas emissions at the source. This not only effectively improves production environments and safeguards operator health but also aligns with increasingly stringent national environmental regulations. Against the backdrop of advancing “dual carbon” goals, adopting water-based polyurethane resin has become a critical choice for enterprises seeking green production and fulfilling social responsibilities, accelerating the industry's transition toward low-carbon and sustainable development.Beyond its outstanding environmental performance, water-based polyurethane resin boasts excellent comprehensive physicochemical properties, opening broad application prospects across multiple sectors. In coatings, formulations based on this resin exhibit superior adhesion, flexibility, and weather resistance, making them ideal for surface treatments in furniture, automotive, and construction applications. Whether applied as a matte finish on wooden furniture or as a base coat on automobiles, these coatings enhance product aesthetics with their refined texture and stable performance while eliminating the pungent odor and environmental pollution associated with traditional solvent-based coatings.In the adhesive field, water-based polyurethane adhesives also deliver outstanding performance. They offer high bonding strength, fast curing speed, and excellent water and temperature resistance, making them suitable for bonding various materials such as wood, leather, and fabrics. In the footwear industry, replacing traditional solvent-based adhesives with water-based polyurethane adhesives not only addresses environmental concerns during production but also enhances the bonding strength and comfort of shoes. This allows consumers to enjoy high-quality products while contributing to environmental protection.Furthermore, water-based polyurethane resin plays a vital role in synthetic leather and elastomer applications. In synthetic leather production, materials formulated with this resin exhibit soft texture, excellent breathability, and high realism—rivaling genuine leather while offering a more eco-friendly manufacturing process. This meets growing consumer demand for high-quality, environmentally sustainable synthetic leather products.With continuous technological advancements, the performance of water-based polyurethane resin continues to improve, and its application areas keep expanding. It serves not only as a vital force driving the green transformation of traditional industries but also as a key component propelling innovation and development in the new materials sector. In the future, water-based polyurethane resin is poised to shine in more fields by leveraging its unique advantages, contributing significantly to building a green and sustainable industrial ecosystem. water based epoxy resin manufacturerswater based polyurethane dispersionswaterborne polyurethane dispersionsno voc water based polyurethanewhat is water based polyurethanewater based polyurethane coatingswater based acrylic polyurethaneis polyurethane water soluble

Styrene acrylic emulsion

When we admire vibrantly colored buildings, touch smooth, even walls, or enjoy clean, tidy home environments, few realize that a key material is quietly at work behind the scenes—styrene acrylic emulsion. This seemingly ordinary white emulsion is an indispensable “multi-functional assistant” in the modern construction industry.1. What is styrene acrylic emulsion?Simply put, styrene acrylic emulsion is a water-based, environmentally friendly material formed by copolymerizing monomers such as styrene and acrylic acid in water. It ingeniously combines the hardness and water resistance of styrene with the flexibility and adhesion of acrylic acid to create a composite material with outstanding performance.2. Why is it so popular?(1) Eco-friendly and safe, worry-free for healthUsing water as the dispersing medium, it contains no organic solvents and emits virtually no irritating odors. No harmful substances are released during production or application. This ensures both construction workers and future residents enjoy a healthier, safer environment.(2) Superior performance and long-lasting durabilityStrong adhesion: Securely bonds to diverse substrates—cement walls, lime bases, or existing coatingsSuperior water resistance: The dried film effectively repels moisture, preventing mold growth and peelingStrong alkali resistance: Withstands alkaline erosion from cement substrates for long-term stabilityStain-resistant and easy to clean: Its dense, smooth surface resists dust and grime buildup, simplifying maintenance(3) Easy application, saving time and effortThe water-based formulation allows for easy dilution and mixing, delivering excellent results whether applied by brush, roller, or spray. Its fast drying speed shortens construction cycles and boosts work efficiency.3. Ubiquitous Application Scenarios(1) Architectural Coatings SectorThis represents the most significant application area for styrene acrylic emulsion. As the primary film-forming agent, it is widely used in:Exterior Wall Coatings: Provides excellent color retention and weather resistance, keeping building exteriors looking new for longerInterior Wall Coatings: Creating healthy, comfortable living environments with easy wipeability and maintenanceWaterproof Coatings: Effectively blocking moisture penetration to protect building structures(2) Construction AdhesivesUsed as tile adhesives, surface primers, etc., offering high bonding strength and excellent workability to ensure reliable finishing quality.(3) Industrial CoatingsUsed in metal corrosion protection, wood preservation, and other fields, offering economical protective solutions.Our styrene acrylic emulsion is produced using advanced processes and stringent quality control, featuring: excellent stability, good compatibility with various additives, and tailored product solutions for different application needs. Choosing styrene acrylic emulsion means selecting not only a premium building material but also embracing a commitment to quality, environmental responsibility, and health. Let us collaborate to create better living and working environments with this green, innovative material. Together, we can ensure every building stands the test of time and radiates enduring brilliance. styrene acrylic emulsion processstyrene acrylic emulsion usesdifference between styrene and acrylicwhat is styrene acrylic paintstyrene acrylic binderstyrene acrylic usesstyrene acrylic vs purewhat is styrene acrylic

Water-based acrylic emulsion: The Invisible Guardian Behind Green Coatings

Behind modern architecture and industrial manufacturing lies a material that is inconspicuous yet ubiquitous—water-based acrylic emulsion. From the wall paint in your home to the textiles you wear, from the covers of the books you read to the interior of the car you drive, this eco-friendly polymer material is redefining the future of the coatings and adhesives industry with its exceptional performance and green credentials.Water-based acrylic emulsion represents the core direction of the coatings industry's transition toward sustainable development. Compared to traditional solvent-based products, it uses water as the dispersion medium, fundamentally solving the issue of volatile organic compound emissions. This eco-friendly characteristic not only makes the production and usage processes safer and healthier but also significantly reduces environmental impact, fully aligning with increasingly stringent global environmental regulations and green consumption trends.1. Superior Film-Forming Properties and AdhesionAcrylic polymer particles form a continuous, dense, and elastic film after water evaporation, demonstrating excellent adhesion to various substrates (such as cement surfaces, wood, metal, plastic, etc.), providing long-lasting and reliable protection.2. Superior Weather Resistance and DurabilityThe coating film produced from water-based acrylic emulsion possesses outstanding UV resistance, resists yellowing and chalking, and offers excellent water and alkali resistance. It maintains vibrant color and stable performance over extended periods, significantly extending the service life of substrates.3. Excellent Processing AdaptabilityThe product features outstanding flow, wetting, and compatibility properties. Its viscosity can be adjusted as needed to accommodate various application techniques. It also exhibits good compatibility with multiple additives, facilitating formulation optimization.4. Safe and Eco-Friendly Usage ExperienceUsing water as the dispersion medium, it is odorless, non-flammable, and non-explosive, significantly improving the construction environment. It is particularly suitable for indoor applications and use around sensitive individuals.5. Innovative Materials for Everyday LifeInterior/Exterior Coatings: Serves as the primary film-forming agent in matte, semi-gloss, and glossy latex paints, delivering superior coverage and durability.Waterproof Coatings: Used in elastic waterproof coatings to resist substrate cracking and leakage.Metal Anti-Corrosion Coatings: Functions as primers or topcoats to shield metal structures from corrosion.Wood Coatings: Applied to furniture, flooring, and other wood products for eco-friendly, safe finishes.Construction Adhesives: Used in tile adhesives, surface primers, and similar applicationsPackaging Adhesives: Serves as a paper bonding agent, environmentally friendly and non-toxicSealants & Caulking: Formulated into elastic sealants for construction joint treatmentTextile Coatings: Provides functional finishes like waterproofing and wrinkle resistance for fabricsPaper Coating: Enhances paper surface properties and improves printabilityWater-based acrylic emulsion, as an outstanding representative of environmentally friendly polymer materials, is gaining increasingly widespread application worldwide. It strikes a perfect balance between performance requirements and environmental considerations, serving as both the core driving force behind the current transformation of the coatings industry and a crucial direction for future developments in materials science. water based vs solvent adhesivedifference between solvent based and acrylicacrylic vs solvent based adhesivewater based acrylic resin typeswhat is solvent based adhesivesolvent based acrylic adhesivewater based acrylic resin meaningwater based acrylic emulsion paint

Methanol

In the vast landscape of the chemical industry, there exists a fundamental compound that is simple yet ubiquitous. It serves as both the lifeblood of modern industry and a bridge to green energy—this is methanol. From traditional manufacturing to cutting-edge technology, spanning energy sectors to daily life, this simplest of alcohols propels innovation and development across countless industries through its exceptional versatility and sustainability.At standard temperature and pressure, methanol exists as a colorless, transparent, volatile liquid with a distinctive alcohol odor. Its molecular structure is simple yet remarkably functional: completely miscible with water, highly polar, possessing high calorific value, and featuring an optimal carbon-to-hydrogen ratio. These properties establish it as an ideal base chemical, efficient fuel, and hydrogen carrier, laying a solid foundation for diverse applications.1. The Cornerstone of the Chemical IndustryAs a fundamental chemical feedstock, methanol is hailed as the “platform molecule of the chemical industry,” serving as the starting point for hundreds of chemical products:Formaldehyde Production: Approximately 30% of global methanol is used to produce formaldehyde, which is further processed into urea-formaldehyde resins, phenolic resins, and other compounds widely applied in the panel, plastics, and coatings industries.Olefin Production: Via MTO/MTP technology, methanol can be converted into ethylene and propylene, establishing non-petroleum pathways for olefin synthesis.Other Derivatives: Used to produce acetic acid, methyl tert-butyl ether (MTBE), dimethyl ether, biodiesel, and numerous other critical chemicals.2. Clean Fuel in the Energy SectorMethanol demonstrates immense potential in the energy domain:Vehicle Fuel: Can serve as a gasoline blending component or direct replacement fuel, offering clean combustion and significant emission reductionsMarine Fuel: Functions as a low-carbon marine fuel, supporting shipping industry emissions reduction and meeting IMO environmental requirementsFuel Cells: Direct methanol fuel cells provide efficient energy solutions for portable electronics and electric vehicles   3. The Ideal Carrier for the Hydrogen EconomyAs the global hydrogen economy develops, methanol has emerged as one of the most promising hydrogen carriers due to its convenient storage and transportation, high hydrogen content, and low reforming temperature. It provides a crucial pathway for the large-scale commercial application of hydrogen energy.4. Other Innovative Application AreasWastewater Treatment: Serves as a carbon source in denitrification processes, efficiently promoting nitrogen removal.Solvent Applications: Functions as a vital industrial solvent for industries including resins, inks, and adhesives.Biodiesel Production: Participates in transesterification reactions to convert animal and vegetable fats into biodiesel.Modern methanol production primarily utilizes natural gas or coal as feedstocks through catalytic synthesis processes. We employ advanced production techniques and stringent quality control systems to manufacture high-purity methanol products meeting international standards.    Through lifecycle management and circular economy models, we are committed to reducing energy consumption and emissions during production, driving the industry's green transformation.Methanol serves not only as a fundamental pillar of modern chemical industries but also as a vital bridge to a sustainable energy future. Its extensive application domains and continuously evolving technological pathways secure its irreplaceable position in global energy transition and chemical supply chains. methanol formulawhat is methanol used for todaywhy is methanol dangerousis methanol toxic to humansmethyl alcoholhow dangerous is methanolmethanol common namewhat is methanol found in