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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).
|Acrylonitrile butadiene styrene||ABS|
|Acrylonitrile styrene acrylate||ASA|
|Alkyd molding compound||AMC|
|Cellulose acetate butyrate||CAB|
|Cellulose acetate propionate||CAP|
|Dough molding compound||MC|
|Liquid crystal polymer||LCP|
|Methyl methacrylate butadiene styrene||MMBS|
|Neoprene (chloroprene butadiene) rubber||CBR|
|Perfluoro alkoxyl alkene||PFA|
|Sheet molding compound||SMC|
|Silicone molding compound||SIR|
|Styrene (butadiene) rubber||SBR|
|Styrene maleic anhydride||SMA|
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.
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.