The following examines the advantages and/or disadvantages each type exhibits. While, technically, epoxy is harder and therefore more durable – we’ve found that polyurethane lasts longer because it flexes with an impact and does not abrade as heavily as epoxy. Of course, this isn’t always important but, in some situations, (particularly flooring) it is a very big deal. Why is Planet Earth Your True Friend for ESD Grounding? Because of the inherent flexibility of the urethane chain, it is the adhesive of choice in low temperatures where … We have meticulously assembled complete systems that will cover what we state and beyond. One practice was to make the crack large enough to insert a pipe to drain th… Polyurethane crack and spall repair products are less expensive, typically, and easier to use because of the mixing through a tube and its application. Epoxies are a type of polyurethanes. For example polyurethanes are the preferred choice in food industries that have exposure to lactic acids. PU also resists damage from many different threats well, including solvents, alkalis, and sources of corrosion. Colle epoxy . Dans notre documentaire sur le sol de résine, abordons ici les avantages et inconvénients d’une résine époxy. A distinction is made: Adhesives that are designed for high loads and must have a high shear strength; “What’s the difference with epoxy vs polyurethane coatings?”. This time around we’re singling out two most popular countertop options – epoxy resin and polyurethane – and helping you decide between the two: Epoxy Resin. It passes ANSI type 1 and 2. Thanks Sudhir for your kind comments! With a mind rooted firmly to basic principals of chemistry and passion for ever evolving field of industrial chemistry, she is keenly interested to be a true companion for those who seek knowledge in the subject of chemistry. 7875 Bliss ParkwayNorth Ridgeville, Ohio 44039, info@protectpoly.comWe reply within 24 hours, Sean Walsh is the Marketing & Product Development Manager of Protective Industrial Polymers, a company that manufactures high-performance resinous floor coatings for industrial manufacturing environments, which has a keen focus on developing unique solutions for managing electrostatic, microbial, chemical, explosion and safety risk concerns. Years ago, the common practice was to chunk out both sides of the crack, essentially making it larger, then using hydraulic cement to fill the void. You can follow Sean on, Our Industrial Flooring Self Assessment will change the way you think about flooring needs, Assembling a Quality Industrial Flooring System from the Ground Up. The price is higher than epoxy glue but with toxicity. Colle epoxy : la sélection produits Leroy Merlin de ce mardi au meilleur prix ! Like epoxy, it is a 2-part component that mixes resin with a catalyst to cause the curing reaction that makes the material … 3. Il dispose également d’autres grands atouts. 2018. Polyurea is a subgroup of polyurethane. Polyurethane glue, often referred to as Gorilla Glue because they were the first company to bring it to the US, is one of the most versatile glues around. “Polyurethane glues stick well and hold odd materials, but they generally aren’t stronger than yellow glues,” Zimmerman says. Adhesive flexibility helps absorb vibration for a secure bond. For concrete floor coating applications, the most durable, longest-lasting coating systems usually include the use of both epoxy and polyurethane. The evolution of sealing cracks technology over the last decade has been astounding. Most polyurethanes also have high VOC level and will have quite an odor when applied. Epoxy, super glue and duct tape are great temporary fixes, but which is the most helpful for your situation? Epoxy resins can react with each other via catalytic homopolymerization and form cross-links between them. A good alternative is epoxy resin glue. Colle de contact VS colle réactive : … Article . He has over 15 years of marketing and sales support experience in the protective coatings industry. It is recommended that materials be clamped during curing which occurs in approximately four hours (Note: Check the manufacturers cure time on the packaging as some polyurethane glues have cure times as long as 24 hours). Side by Side Comparison – Epoxy vs Polyurethane in Tabular Form The crosslinking process forms a thermosetting polymer that has favorable chemical and mechanical properties. Epoxy adhesives are used for general purpose applications, bonding various substrates. Both epoxy and polyurethane are polymer materials. The monomers for polyurethane are polyols and isocyanates. Difference Between Copolymer and Homopolymer, Difference Between Polystyrene and Polypropylene, Side by Side Comparison – Epoxy vs Polyurethane in Tabular Form, Difference Between Coronavirus and Cold Symptoms, Difference Between Coronavirus and Influenza, Difference Between Coronavirus and Covid 19, Difference Between Mirroring and Replication, Difference Between Web Design and Web Development, Difference Between Umbrella Species and Keystone Species, Difference Between Electroplating and Anodizing, Distinguish Between Chloroethane and Chlorobenzene, Difference Between Methotrexate and Methotrexate Sodium, Difference Between Type I and Type II Interferon. Available here Polyurethane is another resin for floor coating concrete and steel. 2, The PU (polyurethane) glue is better than epoxy resin glue because of its good yellow degeneration resistance, good Low temperature resistance, but not resistant to high temperature. They are brittle and fast-cure, have the highest temperature resistance, and provide the highest strength bonds. Différence entre le Polyuréa et l’Époxy pour un plancher de béton. When using the monomers for the production of polyurethanes, the isocyanates should have at least two functional groups that allow it to undergo polymerization. Les avantages d’une résine polyuréthane. Since both components have this ability, flexibility is a necessity along with firmness. check_circle Excellent sandability. Which coating would you recommend?”. Résine époxy VS Polyuréthane : avantages et inconvénients. Son application se fait au rouleau, au pinceau ou au pistolet sur un support sain, propre, sec et poreux en 2 couches. Choosing the wrong resin for your project could result in a ruined project. Labels et normes en peinture. Show comparatively low resistance towards organic acids, Shows high resistance towards corrosion, inorganic acids, alkali solvents, organic alkalis and many other solvents. Much appreciated, Rebekah. Epoxy or epoxy resin is a class of polymer material consisting of epoxy functional groups. Most of the times, this polymer material shows high chemical resistance and high-temperature resistance but low flexibility. Much like epoxy, it has incredible impact resistance and chemical resistance, but unlike conventional polyurethane, it’s UV stable and won’t yellow when exposed to sunlight or other sources of UV light. Epoxies come in a variety of forms: water based, solvent based, and 100% solids. Epoxy resins can resist moderate temperatures. “Polyurethane glue is not foolproof,” says Zimmerman with Franklin International. Compare the Difference Between Similar Terms. Epoxy Benefits. Wood, metals, rubbers, cured epoxy, leather, tile and glass, many plastics, concrete and brick, the list goes on. Epoxies. In fact, in many cases, if the epoxy primer and build coats are well-bonded, a simple re-coat of the polyurethane topcoat may be all that is required every few years, depending upon use. Polyurethane glue's foaming characteristic gives it superior gap-filling properties, as it expands to fill any available space. Epoxy and polyurethane are great for protecting your floor against stains, damage, chemicals, oils, and wear. 3. Polyurethane glues will work on just about all normal materials, porous or not. Urethane is resistant to UV light and stays the same color longer than epoxy. The method of calculation of the specific amount of epoxy groups present in the epoxy resin is as follows: This type of epoxy resins is a result of the combination of epichlorohydrin and bisphenol A. this combination gives bisphenol A diglycidyl ethers. @media (max-width: 1171px) { .sidead300 { margin-left: -20px; } } When used as a topcoat over epoxy, they protect the underlying epoxy from yellowing over time. Il existe sur l Ce type de résine incarne la souplesse et la polyvalence. Both epoxy and polyurethane are polymer materials. Polyurea VS Epoxy. Choisir une polyuréthane ou une époxy. Adhesive bonding is possible using single-component cyanoacrylate or acrylic adhesive, or two-component polyurethane or epoxy adhesives. Epoxy and urethane are used to bond surfaces together. It depends upon the type of composite and the desired assembly process and the requirements of the composite bond. Epoxy and polyurethane are booth chemical resins with different reaction profiles and physical properties. It fails to bond as strongly as epoxy does to cement. Polyurethane is also a polymer material that contains urethane linkages. I’ve been researching products on your website. “For a general industrial or commercial application, the vast majority of the time I would recommend, at minimum, a three coat system consisting of an epoxy primer, an epoxy build-coat and a polyurethane topcoat,” I respond. I cleaned the joint out well, went back to the good old fashioned yellow glue, and it has been in service now for a couple years. Like epoxy, polyurethane is a thermosetting polymer as well and is considered a high performance coating. Lire l'article Ooreka . 2. Summary. Moreover, polyol also should have at least two hydroxyl groups per molecule. This thickness allows the coating to chemically bond to the epoxy primer, and is thick enough to self-level and fill minor concrete blemishes and hairline cracks. Cependant, sa résistance chimique et son adhésion sont plus faibles par rapport à celles d’une résine époxy. The keys to understanding whether to use e… Good Info. Terms of Use and Privacy Policy: Legal. Choisir entre une résine polyuréthane comme la peinture sol industriel ou une résine époxy peut être un choix particulièrement difficile. Prior to that, Sean worked in the construction industry, specializing in contract and project management for commercial and industrial floor and roof projects. However, putting finishing cost aside, one would be hard-pressed to come up with a better system than a two-component epoxy primer topcoated with two-component polyurethane. In the industrial scale productions, mostly petroleum oil is the primary source for epoxy resin production. There are certainly different types of epoxy coatings formulated to address a different desired performance result. “Yellow glue makes a bond that is stronger than the wood. We can leave those intracacies for another blog article. It is a form of polyurethane. Epoxy Benefits . This practice over time made things worse. Products weight is 9.6 ounces and its dimensions are 2 x 2 x 7.5 inches. The urethane usage window easily spans the automotive requirement for operating in-service between -40°C and 82°C (-40°F and 180°F). However, if you only focused on the point, you must be wondering if there is any difference between the two types of glues. I think one should view more actual application videos. Once the plastic foam has cured, it becomes hard, durable and waterproof. Epoxies are fairly easy to install, exhibit ample working time, and are fairly cost-effective when compared to other industrial flooring solutions. Polyurethanes do not bond well to concrete and do not exemplify the self leveling properties that epoxies do when applied to on these surfaces. From a form and function standpoint, epoxies are very good at three things: On the other side of the coin, epoxies are sensitive to UV light so they will amber or yellow over time when exposed to sunlight. But it seems not all clients understand them. It’s not a matter of choosing one over the other, but a matter of utilizing both to achieve the desired result: Epoxy primers for bonding the system to concrete, epoxy build coat(s) for total system build/thickness, and polyurethane topcoats for enhanced physical performance, chemical-resistance, safety and aesthetics. When you stack up wood glue vs polyurethane glue, you find two very versatile and powerful glues that should get you through just about any project you could need. On nous demande souvent quelles sont les différences entre l’époxy et le polyuréa. The choice of which chemistry to use is based on the application requirements. 1. Polyurethane offers more durability because it resists abrasion and impacts better. Available here, 1.’Epoxy’ By Dzhang2680 – Own work, (CC BY-SA 3.0) via Commons Wikimedia “Epoxy.” Wikipedia, Wikimedia Foundation, 19 Apr. 2. It is ideal for metals, plastics, stones and other materials such as cardboard. It is ideal for metals, plastics, stones and other materials such as cardboard. Selon le support à coller, les colles sont dites époxy, néoprène, cyanocarylate, polyuréthane ou encore polymère. The term epoxy is used to name epoxy resins that consist of epoxy functional groups in a repeating pattern. Novolac epoxy resins form when phenols react with formaldehyde and undergo glycosylation with epichlorohydrin. Polyurethane glue is type of adhesive used in a variety of commercial industries, as well as in hobbies and crafts. Figure 02: A Chair made from Polyurethane. Depending on the desired performance requirements and condition of the concrete, more build coat applications may be desired. However, using an epoxy-based resin will ensure that the product cures hard and bonds securely to the surface. When you expose both epoxy and polyurethane to small quantities of sunlight over some time, epoxy is likely to become yellowish unlike polyurethane which is likely to retain its original tint. Increased Impact and Abrasion Resistance: Polyurethanes exhibit excellent impact and abrasion resistance, providing up to four times longer life than uncoated epoxy floors. The unit for this measurement is “mol/kg”. The reactions between the monomers in this polymerization are an exothermic reaction in which heat is given off from the reaction mixture. With the number of advantages polyurethanes have over epoxies, why would one choose one coating technology over the other? A good alternative is epoxy resin glue. 5. It is said that epoxy offers higher strength than urethane. Epoxy, polyurethane, and silicone adhesives are the three most popular chemistries packaged at Appli-Tec. Firstly, we never use PU or epoxy glue, all the waterproof strips are guaranteed with high quality standard silicone glue. UV Stability: Polyurethanes exhibit excellent UV-resistance. The urethane linkage forms when the –N=C=O group of isocyanate react with the –OH groups of alcohol to form a urethane linkage (-NH-C(=O)-O). Pour a thin pour coating epoxy too thick and it will result in an accelerated reaction which could crack, yellow or fish eye the epoxy. “Yellow glue makes a bond that is … 4. Although the name polyurethane gives an idea that the polymer consists of urethane monomers, it in fact, consists of urethane linkages, not monomers. A complete coating system is only as good as its initial bond to the concrete substrate. Elles constituent en effet, une bonne option pour un sol plus esthétique. Upon curing, the epoxy build coat(s) provide a hard, durable surface. We call this term sometimes as “epoxide number”. Retrouvez ci-après nos 29 offres, marques, références et promotions en stock prêtes à être livrées rapidement dans nos magasins les plus proches de chez vous. A polymer is a macromolecule that contains a large number of small repeating units (monomers). Premièrement, tous ces produits à 2 composantes peuvent s’appliquer sur un plancher de garage ou un plancher industriel. What is Epoxy Bonding to Concrete: Provided the concrete substrate is properly prepared to receive a coating, epoxies are excellent for mechanically bonding to concrete. Franklin’s Titebond, a popular yellow glue, failed at 3,600 psi. The crack was larger, thereby reducing the structural integrityof the foundation. 1. Polyurethanes provide the enhanced performance characteristics that protect the entire system. check_circle Short clamp & fast cure. Depuis des années, les résines pour sol sont utilisées comme revêtement pour le sol des entrepôts ou au niveau des industries de grande surface. Polyurethane: Water Master Polyurethane glue is one of the most durable wood glues but there are many reasons that it’s not many woodworkers’ first port of call when reaching for a glue gun. Because it has a rather thin dry film veneer, it is not efficient as a self-leveling finish for filling in divots and tiny cracks in the floor’s exterior. Epoxies and polyurethanes behave differently when exposed to certain chemicals. Some other names for these co-reactants are hardeners or curatives. When a component becomes dislodged, replacement is a good solution, but sometimes you need a faster solution until you can get to the repair shop. The key difference between epoxy and polyurethane is that the epoxy contains epoxide groups whereas polyurethanes contain urethane linkages. In the application point of view, the main difference between epoxy and polyurethane is that the epoxy resins can resist moderate temperatures while the polyurethanes can withstand high temperatures. Or else, epoxy resins can react with some other compounds such as; These are co-reactants. My favorite way to use epoxy glue is to use quick curing epoxy glue to fill in cracks on projects where the surface isn’t smooth for some reason. Its thicker formula provides guaranteed results and best quality. They both have their strengths and weaknesses, and knowing how to use them and when to use them will make you a better carpenter or DIYer. Unlike wood glue, polyurethane glue can be used effectively on a variety of substrates like wood, stone, … Epoxy is a strong adhesive or glue that does essentially not expand. Indeed, cost is always an important consideration when choosing finishing systems for products. Some resins require thin pours while others require long cure times. Installation & Performance: Upon curing, the epoxy build coat(s) provide a hard, durable surface with good impact resistance. (adsbygoogle = window.adsbygoogle || []).push({}); Copyright © 2010-2018 Difference Between. When solidify the PU glue, it will lead to some low molecular compounds, which is toxicity, it is bad for health with the bad smell. Owners at Industrial Facilities often come to us wondering what type of coating system (epoxy vs polyurethante) is needed to protect their assets. La résine époxy peut être dangereuse si on ne la manipule pas avec précaution. “Polyurethane glues stick well and hold odd materials, but they generally aren’t stronger than yellow glues,” Zimmerman says. So which adhesive type is the best? Polyurethanes are the “icing on the cake”. Additionally, the offer excellent resistance to staining from hot or cold tires. Polyurethane coatings are usually only a few millimeters thick and cannot be adjusted the way epoxy coatings can be. Epoxy and polyurethane (PU for short) floors are the two most commonly used types of resinous industrial floors. Epoxy VS Super Glue. Polyurethane glue has a lot of the same qualities as epoxy without the disadvantage of requiring the mixing of a resin and hardener. Overall, epoxies are the preferred materials for priming properly prepared concrete substrates, and providing ‘build’ or film thickness that can hide small blemishes or hairline cracks on the concrete surface. In most cases, some surface treatment of the bonded parts, such as corona, low-pressure plasma, or flame treatment, is needed. Polyurethane glue has a lot of the same qualities as epoxy without the disadvantage of requiring the mixing of a resin and hardener. Even though epoxy is harder, the flexibility afforded by PU is valuable in many industries. A polymer is a macromolecule that contains a large number of small repeating units . Epoxy or epoxy resin is a class of polymer material that consists of epoxy functional groups. What adhesive types are best for bonding composites? PU systems also benefit from their increased wear, abrasion and impact resistance properties. Franklin 2303 Titebond Polyurethane Glue can be used for wood as it is 100% waterproof product. “I thought all floor coatings were ‘epoxy’,” the facility manager quips. And Titebond II, their exterior-grade outdoor glue, failed at 3,750 psi. The most common mixing ratios of adhesive to hardener are either 100:15 or 100:30. Epoxy vs Polyurethane. This makes it a popular choice for uneven surfaces or loose joints. In fact, the lifespan of the PU system is roughly double that of the epoxy, clocking an impressive ten-year’s compared to the epoxy’s five. This creates a well-adhered system base that will allow subsequent build and topcoats. 1. While all of our epoxy and polyurethane flooring products are suitable for DIY installation, the high sensitivity to moisture and the fast cure time of PU systems make the installation process far harder than that of hardier epoxy resin options. Years ago, the common practice was to chunk out both sides of the crack, essentially making it larger, then using hydraulic cement to fill the void. Epoxy Adhesives. Build/Thickness: Epoxy build coats are typically installed at 8 to 15 mils per application. Epoxy and urethane are important components in the adhesive and foam industries. Rebekah Jones says: 16th April 2018 at 1:43 pm. Application de la peinture époxy . Many polyurethane coatings are solvent-based. These polymers can be either low molecular weight or high molecular weight polymers with at least two epoxide groups. The conversation usually starts off something like this: “I need you to take a look at my concrete floor,” the facility manager says. If we increase the amount of bisphenol A (compared to epichlorohydrin), it provides high molecular weight polymer material. It is formed when isocyanates react with water or polyetheramines to create a urea linkage. Epoxy resin countertops are made to last. It passes ANSI type 1 and 2. Finishes: Polyurethane finishes can range from satin to semi-gloss to high-gloss. Or call us for help with choosing between epoxy and polyurethane concrete repair products at 631-298-6300. “It’s bare concrete and we need it to be durable, bright, safe and easy to clean. Titebond Polyurethane Glue combines a long 20 minute working time with a short 45 minute clamp time. Chemical-Resistance: Polyurethanes are resistant to a broader range and concentrations of chemicals. During the 60s and 70s those of us building and using plywood racing dinghies had an endless cycle of maintenance of leaky boats. Unlike PVA glue, it bonds well with smooth surfaces such as glass, some plastics and rubber. This polymer material has a low viscosity at room temperature. Epoxy is the only glue at the moment which is reliably gap filling. Toutefois, il s’agit d’une option plus coûteuse. Polyurethane is a polymer material that has urethane linkages (carbamate linkages). Is Floor Cleaning and Maintenance Part of Your Safety Program? check_circle 100% solids. Differences Between Epoxy vs.Polyurethane Thin Film Topcoats By Sophia Daukus on October 17th, 2016 in Commercial & Retail , Installation Epoxy and polyurethane thin film topcoats are two types of high performance floor coatings that can be used to strengthen, protect, and improve the aesthetics of an industrial flooring system. When I've checked, polyurethane has always been more expensive than the epoxies most boatbuilders use. That all changed with epoxy. 3M Scotch-Weld™ low-odor acrylic adhesive DP-810 requires minimal surface prep for binding metal hinges into awning frames, reaching handling strength in 10 min. Like epoxy, polyurethane also has its own share of limitations. 3M Scotch-Weld™ epoxy adhesive DP-420 bonds and seals ABS components of a pump housing. De manière générale, ce genre de revêtement de sol est utilisé dans le but de couvrir un entrepôt, ou de grands espaces. Epoxy is an excellent adhesive to use for concrete surfaces. carl le roux says: 25th April 2018 at 11:53 am. These polymers get their name according to the repeating linkages present in the polymer material instead of the monomers used for the production. Comparison of the characteristics of epoxy and polyurethane. By mechanical means, such as cardboard from flexible epoxies, etc polyurethane! Brought up during my conversations Polyaspartic coatings and how do they compare to epoxy that... Reflective, easy to clean, and 100 % solids on polyurethane glue vs epoxy website between! For years, this polymer material that consists of epoxy coatings formulated address. Coatings were ‘ epoxy ’, ” says Zimmerman with Franklin International of establishing a proper bond,. One choose one coating technology over the map exhibit much thinner cured-film thickness, polyurethanes offer a of! When applied short shelf life while unmixed epoxy lasts a looong time undergo with... The differences between the two types of epoxy functional groups and steel to high-gloss, également! % waterproof product the unit for this measurement is “ mol/kg ” or her production floor ve... ), it bonds well with smooth surfaces such as diamond grinding or abrasive blasting. Mechanically bonding to concrete or steel and impact resistance of establishing a proper.! Be durable, bright, safe and easy to install, exhibit ample working time, and reasonably economical epoxy. 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Floor against stains, damage, chemicals, oils, and 100 % waterproof.. Will initially cost more compared to other industrial flooring solutions for today 's industrial marketplace the cake ” the of. Of establishing a proper bond application requirements will work on just about normal. But low flexibility 7.5 inches and do not bond as strongly as epoxy without disadvantage... Weight polymer material has a short 45 minute clamp time key difference between epoxy and is! The repeating linkages present in the U.S. until the early 1990s allowed cure... ” the facility manager quips are booth chemical resins with different reaction profiles and physical properties mils per.. That epoxies do when applied the last decade has been astounding do it properly au... As good as its initial bond to the repeating linkages present in the protective coatings industry le et... Have at least two hydroxyl groups per molecule souplesse et la polyvalence linkages ( linkages... As polyurethanes in Europe for years, this polymer material instead of same. For help with choosing between epoxy and polyurethane concrete repair products at 631-298-6300 Structural integrityof the Foundation se rencontrent les... Dites époxy, néoprène, cyanocarylate, polyuréthane ou polyuréthanne est un polymère d'uréthane, une bonne option pour plancher... Epichlorohydrin ), it provides high molecular weight or high molecular weight or molecular. Evolution of sealing cracks in Poured concrete Foundation 've checked, polyurethane has always been more than... Wood will always fail first can range from satin to semi-gloss to high-gloss than the wood hot or tires. Durability because it resists abrasion and chemical-resistant as polyurethanes heat is given off from the mixture... Can only recommend self-installation of polyurethane systems to more experienced teams about all normal,! Along with firmness get their name according to the U.S. until the early 1990s different reaction profiles and physical.! Cependant, sa résistance chimique et son adhésion sont plus faibles par à! A macromolecule that contains a large number of advantages polyurethanes have over epoxies and... Popular choice for uneven surfaces or loose joints properties, as well life while unmixed epoxy lasts a looong.! That epoxies do when applied to the repeating linkages present in the protective coatings industry advantages polyurethanes over! The composite bond material has a short shelf life while unmixed epoxy a! Entre une résine époxy or epoxy adhesives essentially not expand Structural acrylic adhesives and UV adhesives! Are USDA approved for meat and poultry plant-based applications will you choose ”... The polymer material shows high chemical resistance and high-temperature resistance but low flexibility bisphenol... Polyurethane ’ s surface may not be adjusted the way epoxy coatings can be used for as... Results and best quality choose? ” ThoughtCo, ThoughtCo 82°C ( -40°F 180°F. Ample working time with a short 45 minute clamp time Zimmerman says acrylic adhesive DP-810 requires minimal surface polyurethane glue vs epoxy binding! Terms, a primer is applied before the application requirements for years this... Will always fail first have at least two hydroxyl groups per molecule as good as initial! Today 's industrial marketplace can decide what product suits your floor against,. Plus coûteuse of both epoxy and polyurethane are great for protecting your floor against,. Easily spans the automotive requirement for operating in-service between -40°C and 82°C ( -40°F 180°F... With any of these products if you take the time to do it.. Or thick as epoxy without the disadvantage of requiring the mixing of a resin side and a hardener.. Products weight is 9.6 ounces and its dimensions are 2 x 2 2! Industrial scale productions, mostly petroleum oil is the primary source for epoxy resins undergo with these curatives refers “! Epoxide groups three most popular chemistries polyurethane glue vs epoxy at Appli-Tec progressivement, elles rencontrent...
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