1、 FORD LABORATORY TEST METHOD BO 004-01 Date Action Revisions 2001 03 20 Editorial no technical change A. Cockman 1992 07 13 Printed copies are uncontrolled Page 1 of 2 Copyright 2001, Ford Global Technologies, Inc. PARTICLE SIZE TEST FOR RESINS Application This procedure is used to determine by siev
2、e analysis the uniformity of particle size of powdered resins which are used in Foundry practice in the shell molding process. Apparatus Required Sieves U.S. Standard, Sieves Nos. 100, 200 and 325. Balance Analytical type. Conditioning and Test Conditions All test values indicated herein are based o
3、n material conditioned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. Procedure 1. Weigh 20 +/- 0.05 g of the powdered resin and transfer quantitatively to a No. 100 si
4、eve. 2. Brush the powder over the screen, then alternately rotate and tap while holding the screen in a slightly inclined position so that the test sample will be evenly distributed over the sieve. Continue until no more material passes through the screen. 3. Transfer the portion remaining on the No
5、 100 sieve to the balance pan and weigh. FORD LABORATORY TEST METHOD BO 004-01 Page 2 of 2 Copyright 2001, Ford Global Technologies, Inc. 4. Repeat the operations with the portion passing a No. 100 sieve to determine how much remains on a No. 200 sieve. Repeat on a No. 325 sieve. Calculate the perc
6、entage passing each sieve as follows: % passing a No._ sieve = 100 minus (weight of resin retained x 100) ( weight of sample ) Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities.
