Flame-retardant grades/applications

Flame-retarded grades are widely used for various computer connectors and circuit board components. Representative applications are edge card connectors, grid arrays and memory modules. Non-flame-retarded grades find use in automotive under-the-hood applications, typically connectors and related parts. As higher temperature soldering techniques become more common in the automotive industry, the use of high-temperature plastics such as PCT is expected to increase. It is also possible to formulate unreinforced PCT with crystallization aids and... 

In just 17 years, the entire field of flame retardancy has taken a giant leap forward and the technology to provide FR synthetic materials has made remarkable progress. Today, flame retardant grades of synthetic polymers have found applications in areas considered impossible a few years ago. One example is the use of polyurethane foam in upholstered furniture for high-risk occupancies such as hotels, prisons and hospitals. Polyurethane foam, which was once described in the press as "solid gasoline" is now formulated to withstand severe fire test exposure without propagating the fire. 

Pellets for injection-molding, extmsion, and blow-molding applications include mineral-filled, glass-filled, pigmented, and flame-retarded grades. 

Precompounded blends of ABS and PVC have also been commercially available for molding and extrusion applications as low-cost alternatives to flame-retarded grades of ABS and PPE/HIPS blends. Commercial ABS/PVC blends offer... 

ASA resin has been sold as the flame-retardant grade and finer glass-reinforced grade, which can be used in broad applications. ASAresin has seen use in substantially the same application fields as ABS resin, and particularly has been developed mainly for the outdoor product which demands the weatherability ... 

Low flammability is a necessity for most applications including those used in exchange equipment. Flame retardant grades are, therefore, normally employed and there is a move towards the use of plastics with inherently low flammability. 

Acrylonitrile-butadiene-styrene, a modified polystyrene, is the material most widely used for the injection moulding of telephone housings. It exhibits good mouldability with good surface finish and impact strength, and is available in flame retardant grades. It has been used for other applications such as connectors, but its poor solvent and temperature resistances have led to its displacement from applications demanding these properties. 

Flame retardants are added to reduce the flammability of PE. The unmodified PE grades have a 94 horizontal burn rating up to 0.8 mm thickness. Suitable flame-retardant grades with V-O rating at 3.2 mm thickness are available from compounders. Flame retardants can reduce the processability and interfere with the function of certain hindered amines as light stabilisers. Flame-retardant grades are generally not suitable for use in food contact applications. 

Applications Semi-crystalline flame retarded grades. ... 

Vamp-Technologies S.p.A Applications Flame retardant grades. Vampter PBT... 

Flame-Retardant Applications. The flame resistance of polyolefins, unsaturated polyester, mbber, and many other synthetic materials can be improved by the iaclusion of chloriaated paraffias. The soHd 70% chlorine product is the preferred choice ia most polymeric systems, but the Hquid grades are widely used ia mbbers, polyurethane, and textile treatments. 

The major uses of BPA are in the production of polycarbonate resins (63%) and epoxy resins (27%). Polycarbonates have major outlets in automotive parts, compact discs, eyeglasses, and sheet and glazing applications, and have caused bisphenol A consumption to more than double during the past decade. Epoxy resins are two-component adhesives for very strong bonding. Miscellaneous uses include flame retardants (mostly tetrabromobisphenol A) and other polymer manufacture. Polycarbonate grade bisphenol A is >99% p,p isomer. The epoxy grade is 95% p,p. The p,p and o,p isomers can be separated by a combination of distillation and crystallization. 

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