MIL-DTL-25988C
3.3 Materials
The cured compound of fluorosilicone elastomer rubber shall be entirely suitable for the
intended purpose and shall be of the same composition and quality as the materials used for the
first article sample.
3.4 Dimensions and tolerances
3.4.1 Sheets and strips
Unless otherwise specified (see 6.2) sheets and strips shall be supplied in the lengths and
on thickness shall be as shown in TABLE I. The dimensions and tolerances of shapes cut from
sheet and strip shall be as specified on the detail drawings.
TABLE I. Thickness tolerances of sheet and strip.
Nominal thickness (inch)
Mm
Tolerances (inch)
Mm
0.031 and less
0.787
±0.010
±0.254
Over 0.031 to 0.063 inclusive
0.787 to 1.60
±0.012
±0.305
Over 0.063 to 0.125 inclusive
1.60 to 3.18
±0.016
±0.406
Over 0.125 to 0.188 inclusive
3.18 to 4.78
±0.020
±0.508
Over 0.188 to 0.375 inclusive
4.78 to 9.53
±0.031
±0.787
Over 0.375 to 0.563 inclusive
9.53 to 14.3
±0.047
±1.19
Over 0.563 to 0.750 inclusive
14.3 to 19.1
±0.063
±1.60
Over 0.750 to 1.000 inclusive
19.1 to 25.4
±0.093
±2.36
Over 1.000
25.4
±10%
±10%
3.4.1.1 Sheets
The width of sheet material shall be 36 ±1 inch (91.4 ± 2.54 cm) and the length shall be 120
inches (3.05 m) ± 1 percent.
3.4.1.2 Strips
The width of strip shall be 4 inches (102 mm) ± 5 percent and the length shall be 75 feet ± 1 foot
(22.86 m ± 0.305 m).
3.4.2 Molded parts (excluding O-rings) and extruded shapes (including tubing)
Unless otherwise specified (see 6.2), dimensions and tolerances of molded parts (excluding
O-rings) and extruded shapes (including tubing) shall be as specified on the drawing.
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