Phenol-Formaldehyde Phenolics

Suggested adhesives include urea-formaldehyde, epoxy-polyamine, neoprene, nitrile-phenolic, styrene-butadiene, phenolic-polyvinyl butyral, polysulfides, furans, polyesters, and polyurethanes. 

Suggested adhesives include modified acrylics, epoxies, polyesters, resorcinol-formaldehyde, furane, phenol-formaldehyde, polyvinyl formal-phenolic, polyvinyl butyral, nitrile rubber-phenolic, polyisobutylene rubber, polyurethane rubber, reclaimed rubber, melamine-formaldehyde, epoxy-phenolic, and cyanoacrylates. For maximum adhesion primers should be used. Nitrile-phenoUcs give excellent bonds if cured under pressure at temperatures of 149 C. Lower-strength bonds are obtained with most rubber-based adhesives. 

Adhesives recommended are epoxies, phenolic-polyvinyl butyral, epoxy-phenoUc, nitrile-phenolic, polyurethane, neoprene, butadiene-nitrile rubber, cyanoacrylates, resorcinol-polyvinyl butyral, furane, and urea-formaldehyde. 

Adhesives recommended are neoprene and urethane elastomers, epoxies, and modified epoxies, phenolic-polyvinyl butyral, nitiile-phenohc, polyester, cyanoacrylates, resorcinol-formaldehyde, phenolics, polyacrylates, modified acrylics, PVC, and urea-formaldehyde. Phenolic adhesives give good results, but require higher cure temperatures and are less water-resistant than resorcinol-based adhesives. 

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Chemical Class Phenol- Formaldehyde Phenol- Formaldehyde Phenol-Formaldehyde... 

Phenol-formaldehyde (phenolic) plastics The chemical resistance is affected by the phenol used, cresols giving the best acid resistance whilst xylenols are often used to obtain the best alkali resistance. For chemical-resistant applications the fillers used in moulding powder and reinforcing material in laminates should be inorganic, e.g. asbestos or glass. The resins are usually dark in colour. 

Urea—formaldehyde (UF) resins commonly were used in the past. However, because of the lack of moisture resistance and the potential for the resins to hydrolyze in the presence of moisture and decompose into urea and formaldehyde, they are not used as much now. Governmental regulations are under development that eliminate the use of UF resin in wood products. This would limit the exposure of the public to formaldehyde, a listed carcinogen, formed by the decomposition of UF resin. Today most wood products use phenol—formaldehyde (phenolic) resins, but urethane-based resins are becoming more common. 

Phenol-Formaldehyde. Phenolic plastics were the first commercial synthetic plastics in 1908, and were the leading commodity plastic for 40 years, until the growth of vinyl and styrenic thermoplastics (Table 15.15). Now quite mature, they remain the second largest family of thermoset plastics. 

Difficult to Ignite, extinguishes when removed from flame Bright, sooty Phenol, formaldehyde Phenolic resins... 

Cold wall heats of ablation values ranged between 7700 and 13,800 Btu/lb. The best performance was obtained with the heterocyclic polyimide and polybenzimidazole and the aromatic polyphenylene resins, all of which exceed the heat of ablation for the widely used phenol formaldehyde (phenolic) resin. The superior charring characteristics of these polymers contributed greatly to their high heats of ablation. The various plastic materials, with their inherently low thermal conductivities, greatly restricted the flow of heat from the surface region into the specimen substrate. 

Synonyms Alkyl-phenol formaldehyde resin A-stage resin Novolac resin Novolak resin One-stage resin PF Phenol-formaldehyde Phenol-... 

Phenol-formaldehyde Phenol-formaldehyde resin Phenol-furfural resin Resole Resole resin... 

There are a number of types, based on their chemical structure, but the most important and most widely used is nylon 6,6. The best adhesives for bonding nylon to nylon are solvents. Various commercial adhesives, especially those based on phenol-formaldehyde (phenolics) and epoxy resins, are sometimes used for bonding nylon to nylon, although they are usually considered inferior to the solvent type because they result in a brittle joint. Adhesives recommended include nylon-phenoUc, nitrile-phenolic, nitriles, neoprene, modified epoxy, cyanoacrylate, modified phenolic, resorcinol-formaldehyde, and polyurethane. Bonds in the range of 1.7-6.9 MPa, depending on the thickness of the adherends, have been obtained. ... 

Phenols Formaldehyde. Phenol-formaldehyde resins were the first commercial synthetic plastics. Since their invention in 1908, they have grown and matured into the second most important family of thermoset plastics, with a U.S. market volume of 4 bU-hon Ib/yr (see Table 3.6). 

Phenol-formaldehyde phenolic resins). A range of rather brittle, dark brown or black thermosetting resins. The original material was given the trade name Bakelite the first synthetic resin produced, it was used for electrical fittings and casings. Later variations, less brittle, are used for pump impellers, dip-pipes, agitators, and bottle closures. 

Synonyms P-F-R-2 resol phenol formaldehyde resin phenol formaldehyde phenol polymer with formaldehyde formaldehyde-pnenol polymer paraformaldehyde-formaldehyde-phenol polymer paraformaldehyde-phenol polymer phenol-formaldehyde polymer Novolac Resole resol based on phenol, resorcinol, and formaldehyde... 

Additives used in final products accelerator (MTBS) antidegradants (amine type), antioxidant curing agents (ZnO, Zn stearate) fillers (carbon black and mineral fillers, such as silica, clays, talc, whiting), peroxide (e.g. dicumyl) release agent (metal stearates), retarder (MgO) plasticizers (petroleum based oils), sulfur tackifying resins (phenolic, phenol-formaldehyde, phenol-acetylene, hydrocarbon resins UV stabilizer (carbon black) ... 

Both thermoplastic and thermosetting polymers are used as rigid foam materials these include (and are ranked from least to most expensive) polystyrene, phenol-formaldehyde (phenolic), polyurethane, poly(vinyl chloride), polypropylene, polyetherimide, and polymethacrylimide. 

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