This standard applies to the determination of the melting point of powdery, granular and flake partially crystalline polymers. This standard does not apply to the melting point determination of crystalline polymers with additives that interfere with birefringence.
GB/T 4608-1984 history
2008GB/T 16582-2008 Plastics.Determination of melting behaviour (melting temperature of melting range)of semi-crystalline polymers by capillary tube and polarizing-microscope methods
1984GB/T 4608-1984 Test for melting point of semicrystalline polymers--Optical method
GB/T 4608-1984 Test for melting point of semicrystalline polymers--Optical method was changed to GB/T 16582-2008 Plastics.Determination of melting behaviour (melting temperature of melting range)of semi-crystalline polymers by capillary tube and polarizing-microscope methods.