How to distinguish the quality of tin cure silicone rubber?

1. The brightness is good, the purity of the silicone is high, and the blackish and impurityy product is a powder that the dealer adds a few kilograms to the cost to reduce the cost.

2. The same weight, the bigger the better. Smaller products, high density, the main reason is to add high density and low price powder

3. After purchasing for a certain period of time, the silicone has a layering, the top looks like oil, and the bottom is powder, which is lower in mold silicone.

Remarks: Those  powders maybe is gypsum powder, calcium carbonate, quartz powder, etc.

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