Plastics, reinforced

Lead and Lead-Lined Steel Pipe Lead and lead-hned steel lipe have been essentially eliminated as piping materials owing to lealth hazards in fabrication and installation and to environmental objections. Lead has been replaced by suitable plastic, reinforced plastic, plastic-lined steel, or high-alloy materials. 

The carbon bed can be supported by glass wool, wire cloth, etc. Columns and fixtures can be constructed from glass, plastic, reinforced fiberglass, or metal. Borosilicate glass is commonly used. It is essential that all columns used in the pilot system have at least the same internal diameter. 

Reinforced plastics (RPs) hold a special place in the design and manufacturing industry because they are unique materials (Figs. 6-11 and 6-12). During the 1940s, RPs (or low-pressure laminates, as they were then commonly known) was easy to identify. The basic definition then, as now, is simply that of a plastic reinforced with either a fibrous or nonfibrous material. TSs such as polyester (Table 6-19) and E-glass fiber dominated and still dominates the field. Also used are epoxies. 

Both shape and design details are heavily process related. The ability to mold ribs, for example, may depend on material flow during a process or on the flowability of a plastic reinforced with glass. The ability to produce hollow shapes depends on the ability to use removable cores, including air, fusible or soluble solids, and even sand. Hollow shapes can also be produced using cores that remain in the product, such as foam inserts in RTM or metal inserts in IM. 

Glass fibres are the most commonly used reinforcements, accounting for 95% of the consumption of fibres for plastic reinforcement. 

ISO 10122 1995 Reinforcement materials -Tubular braided sleeves - Basis for a specification ISO 10371 1993 Reinforcement materials - Braided tapes - Basis for a specification ISO 12215-1 2000 Small craft - Hull construction and scantlings - Part 1 Materials Thermosetting resins, glass-fibre reinforcement, reference laminate ISO 15100 2000 Plastics - Reinforcement fibres - Chopped strands - Determination of bulk density... 

Other textile fibres - polyester, rayon, polyamide - have low moduli (see Table 6.12), which limits their plastic reinforcing power. They are used particularly for the reinforcement of soft thermoplastics such as plasticized PVC. 

Modification of mechanical properties Impact modifier Plasticizer Reinforcing filler Catalyst Vulcanizer Blowing agent Curing agent ... 

Braids -in reinforced plastics [REINFORCED PLASTICS] (Vol21)... 

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