This British Standard describes the methods for testing unsaturated polyester type synthetic resin and laminate specimens manufactured from the resin, to show conformance to the requirements of BS PL 4.
BS PL 5:2005 history
0000 BS PL 5:2005(2011)
2005BS PL 5:2005 Unsaturated polyester resins for low pressure laminating of high strength fibre reinforced composites - Test methods