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What properties of the resin affect the quality of the abrasive paper?
At present, the resins used in the abrasive paper are: urea resin, phenolic resin and epoxy resin.
Urea resin: Cheap, low cost, but will get mold after a period of time. Poor strength and wear-resistance.
Phenolic resin: Hard, wear resistant and suitable price. Suitable for aggressive grinding and mainly used in machine sanding abrasive papers that have requirement of aggressiveness, like dry sanding and belts,etc.
Epoxy resin: Expensive, soft but not that tough and wear-resistant. Mainly used in hand sanding abrasive papers that have requirement of softness.
In actual use, there will be different formula for different work pieces and usages. 

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