AIR FORCE A-A-1722-1981 GRAIN ABRASIVE (SOFT BLASTING)《研磨(软爆破)颗粒》.pdf
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1、Al- 1722Febtwary 5, 1981CW4ERCIAL ITEM DESCRIPTIONGRAIN, ABRASIVE (SOFT BLJSTING)The General Services Administration! has authorized the use Ofthis commercial item description in preference to MilitarySpecification 141L-G-5634.This carcial itam description covers soft abrasive grains to be used as a
2、brasive blasting material forthe rsmval of carbon fmm metallic surfaces.Salient characteristics:Shall be of the following types, .ss speciffed:TYW 1 - Apricot pit shell turbojet approved grain (for use on aircraft jet engines and generaluse).Type !1 - Black walnut shell (for general purpose use).Typ
3、e Ill - Rice hull.Shall have the particle size distribution as shown in table 1:TABLE 1.Types I and II, percent retained Type 111, percent reta$nedU.S. standard screen size liininams Maxiln!m Minim nsxicaln-;! -;!90.030 .40 -60 -100 -0.0 -5.0 - .-.-14.05.0 - 65.0- -1.0 -0.0-18.0-Specific gravity of
4、types 1 and 11 shall be frmn 1.20 to 1.40; specific gravity of type Ill shall befmn 1.10 to 1.55.Hater content shall not exceed 10 percent by weight.The toluene soluble content shall not exceed 1.5 percent by weight.The product shall be free (in excess of 0.01 percent by weight) fran contaminating_t
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