JB/T 10043-2012Method for abrasive grain recovery from surface coated abrasives (English PDF)

1 Scope

This standard specifies the reagents, equipment and instruments used when separating the abrasive grain from coated abrasives, and the preparation of the sample and the test procedure.

It applies to coated abrasives bonded with animal glue, with semi-resin, with full resin and with water-resistant bonds.

It does not apply to abrasive paper made with glass grit as the abrasive.

2 Reagents

2.1 Water: distilled water or deionized water.

2.2 Hot water: distilled or deionized water above 50 °C.

2.3 Hydrochloric acid: relative density 1,19, chemically pure.

2.4 Sodium hydroxide: chemically pure.

2.5 Ethanol: chemically pure.

2.6 Sodium hydroxide solution (50 %): dissolve 50 g of sodium hydroxide in water and dilute to 100 mL.

2.7 Sodium hydroxide solution (10 %): dissolve 10 g of sodium hydroxide in water and dilute to 100 mL.

2.8 Sodium hydroxide-ethanol mixture: mix the 10 % sodium hydroxide solution with an equal volume of ethanol. This mixture shall be prepared when it is to be used.

3 Equipment and instruments

3.1 Electric drying oven.

3.2 Box-type resistance furnace.

3.3 Balance: graduation 0,1 g.

4 Preparation of the sample

4.1 A sample of coated abrasive of grit P220 or coarser shall be large enough to yield 100 g of abrasive; a sample of P240 or finer shall be large enough to yield 2,5 g of abrasive.

4.2 On a smooth sheet of paper, cut the sample of coated abrasive into pieces of about 25 mm × 25 mm and place them, together with any abrasive that has fallen off, in the sample bag ready for use.

5 Test procedure