BS PL 4:2005

This standard BS PL 4:2005 Properties of unsaturated polyester resins for low pressure laminating of high strength fibre reinforced composites. Specification is classified in these ICS categories:

• 59.100.01 Materials for the reinforcement of composites in general
• 83.120 Reinforced plastics

This British Standard specifies requirements for unsaturated polyester-type synthetic resins (modified or unmodified), with a suitable curing agent for use in the impregnation of high strength glass fibre capable of moulding at low pressure during the curing process.

NOTE Modified resins may contain constituents such as thixotropic agents, fire retardants, pigments and fillers.