The following symbols are commonly used on individual Recognitions to represent generic material types. These symbols are based on terminology developed by the International Organization for Standardization publications covering “plastics-symbols” (ISO 1043) and “rubbers and lattices” (ISO 1629).

Generic material Symbol
Acrylonitrile butadiene styrene ABS
Acrylonitrile styrene acrylate ASA
Alkyd molding compound AMC
Cellulose acetate CA
Cellulose acetate butyrate CAB
Cellulose acetate propionate CAP
Chloroprene rubber CR
Diallyl phthalate DAP
Dough molding compound MC
Epoxy EP
Ethylene/propylene/diene EPDM
Ethylene/propylene E/P
Ethylene/vinyl acetate E/VAC
Ethylene/tetrafluoroethylene E/TFE
Liquid crystal polymer LCP
Melamine-formaldehyde MF
Melamine/phenolic M/P
Methyl methacrylate butadiene styrene MMBS
Natural rubber NR
Neoprene (chloroprene butadiene) rubber CBR
Nitrile rubber NBR
Perfluoro alkoxyl alkene PFA
Phenol-formaldehyde (phenolic) PF
Polyamide (nylon) PA
Polyamide imide PAI
Polyarylate PAR
Polybutadiene rubber PBR
Polybutylene terephthalate PBT
Polycarbonate PC
Polycarbonate/acrylic PC/A
Polychlorotrifluoroethylene PCTFE
Polyetheretherketone PEEK
Polyether imide PEI
Polyethersulfone PES
Polyethylene PE
Polyethylene terephthalate PET
Polymethyl pentene PMP
Polyoxymethylene (acetal) POM
Polyphenylene ether PPE
Polyvinyl acetate PVAC
Perfluoroethylene propylene FEP
Polyimide PI
Polymethyl methacrylate PMMA
Polyphenylene oxide PPHOX
Polyphenylene sulfide PPS
Polypropylene PP
Polystyrene PS
Polysulfone PSU
Polytetrafluoroethylene PTFE
Polyurethane PUR
Polyvinyl chloride PVC
Polyvinylidene fluoride PVDF
Polyvinyl fluoride PVF
Polyester PER
Sheet molding compound SMC
Silicone rubber SI
Silicone molding compound SIR
Styrene acrylonitrile AS
Styrene/butadiene S/B
Styrene (butadiene) rubber SBR
Styrene maleic anhydride SMA
Styrene/methylmethacrylate S/MMA
Thermo elastomeric TEE
Urea-formaldehyde UF
Unsaturated polyester UP

Foamed Materials

Materials that have been foamed with the introduction of chemical blowing agents or inert gas may have significantly different properties than non-foamed or solid material forms; ratings that are established for solid (non-foamed) material do not automatically apply to the foamed version of the same material.

Materials Used for Structural Parts

Where the retention of physical properties for a material has been investigated for structural parts in specific applications (e.g. room air conditioners) this is noted in the individual Recognitions and meets a minimum level beyond which consideration depends on the actual design and use of the part.

Materials for Use in Special Environments

Investigation of materials for specific end-use product applications where requirements exist for the retention of properties after exposure to certain critical operating and/or environmental conditions may be indicated in the individual Recognitions.

Composite Materials

These materials consist of a sandwich-type construction – a metal and a plastic – and have been tested for flammability to determine compliance with UL 94 only. Materials may also contain an adhesive that serves to bond the individual components into a composite structure.