]2.4
HYDRATED LIME
ASTM C 206, Type S.
2.5
AGGREGATES
2.5.1
Sand for Gypsum Base Coats
ASTM C 35.
a.
Sand Gradation: Percentage Retained by weight (plus or minus 2
percent) on each sieve.
Sieve Size
Max.
Min.
No.
4
[4760
microns]
0
0
No.
8
[2380
microns]
5
0
No. 16
[1190
microns]
30
5
No. 30
[ 590
microns]
65
30
No. 50
[ 300
microns]
95
65
No. 100
[ 150
microns]
100
90
2.5.2
Sand for Gypsum Sand Float Finish
**************************************************************************
NOTE: Aggregates for finish-coat plaster should be
less than No. 16 sieve size. Larger sizes may be
added for finish appearance purposes. Select sieve
number that will provide the desired texture. Float
texture is governed by maximum sieve sizes of sand.
Sieve sizes of 20 to 30 provide a fine float finish
and 16 to 20 provide a coarse finish.
**************************************************************************
ASTM C 842.
a.
Sand Gradation: Percentage Retained by weight (plus or minus 2
percent) on each sieve.
Sieve Size
Max.
Min.
No. 20
[850
microns]
0
...
No. 30
[590
microns]
0.5
...
No. 100
[150
microns]
100
40
No. 200
[ 75
microns]
100
70
2.5.3
Lightweight Aggregates, Perlite or Vermiculite for Gypsum Base Coat
ASTM C 35.
2.5.4
Silica Sand or Perlite Fines
For use in lime-putty gypsum-gaged finish, aggregated white coat, shall
have the following gradation: 10 percent maximum retained on a No. 30
sieve (590 microns), 4 percent minimum and 70 percent maximum retained on a
No. 100 sieve (150 microns), and 70 percent minimum and 100 percent maximum
retained on No. 200 (75 microns) sieve.
SECTION 09210
Page 8
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