This standard specifies the method for measuring the refractive index of resin finishing agents. This standard applies to the determination of the refractive index of resin finishing agents.
GB/T 6691-2007 history
2007GB/T 6691-2007 Resin finishing agent.Determination of refractive index
1986GB/T 6691-1986 Resin finishing agent--Testing methods for refractive index