ISO-11127-2-1993.pdf
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1、INTERNATIONAL STANDARD IS0 11 l27-2 First edition 1993-l 2-l 5 Preparation of steel substrates before application of paints and related products - Test methods for non-metallic blast-cleaning abrasives - Part 2: Determination of particle size distribution Prr?paration des subjectiles dacier avant ap
2、plication de peintures et de produits assimil R20/3 and R20 sizes) mm mm mm mm 0,036 0,112 0,355 1,12 0,040 0,125 0,400 1.25 0,045 0,140 0,450 I,40 0,050 0,160 0,500 I,60 0,056 0,180 0,560 1,80 0,063 0,200 0,630 2,00 0,071 0,224 0,710 2.24 0,080 0,250 0,800 2.50 0,090 0,280 0,900 2,80 0,100 0,315 1
3、,oo 3,15 3.2 Rotating sieve machine, for agitating the sieves with the sample at a frequency of rotation of approximately 300 min- and provided with a timer for time periods of up to 30 min in 1 min intervals. NOTE 2 Other sieve machines may be used provided the same results are obtained. 3.3 Balanc
4、e, capable of weighing to an accuracy of 0,1 9. 4 Sampling Take a representative sample of the product to be tested, as described in IS0 11127-l. 5 Procedure Carry out the determination in duplicate. 5.1 Weigh out, to the nearest 0,l g, a test portion of approximately 300 g of the sample (m,). 5.2 U
5、se all the test sieves listed against the grade under test as given in the grade and screening speci- fication table in the appropriate part of IS0 11126 (see annex A) or, in the case of materials not covered by IS0 11126, as otherwise agreed between the inter- ested parties. 5.3 Arrange the test si
6、eves (3.1) with the largest- aperture sieve on the top and progress to the smallest aperture at the bottom, with a pan to catch any abrasive that falls through the finest sieve. 5.4 Place the test portion in the top sieve. 5.5 Place a cover over the top sieve. 5.8 Place the stack of sieves with the
7、test portion in the rotating sieve machine (3.2) and operate the sieve machine for 15 min. 5.7 Carefully remove the top sieve from the stack and transfer any retained abrasive on to the balance pan. Brush the sieve clean of any trapped abrasive and add this to the balance pan. Weigh to the nearest 0
8、,l g and record this result (m,). Repeat for all the sieves in the stack, including the retaining pan. 6 Expression of results For each test sieve used, and for the residue in the pan, calculate the percentage of material retained R, expressed as a percentage by mass, using the equation R=+ 100 wher
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- ISO 11127 1993
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