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... and application of its main product, hexa-hydroxymethyl melamine, develop tri-hydroxymethyl melamine and tetra-hydroxymethyl melamine and realize industrial co-production with hexa-hydroxymethyl, and strive...
...Materials: HEMA-NVP Base curve: 8.5mm 1. Material: silicon hydrogel, hydrating polymer (methyl methacrylate, hydroxyethyl methacrylate, glycine methacrylate, etc.). 2. Center thickness: Generally speaking, t...