MIL-DTL-5516D
TABLE II. Maximum production permissible variations in physical properties from
contractors' first article values.
Property
Class A
±0.021
Specific gravity, points
Hardness, shore A durometer at
±3 2
24° ± 3°C. (75° ± 5°F), points
Tensile strength, percent
±15
Elongation, percent
±20
Modulus, pounds, percent
Not required
Permanent set, percent
±20
Corrosion and adhesion
Slight corrosion on steel
Volume change
Swell determined from first article
test value ±2 (see example 3) but
must stay within limits specified in
Table I.
1
If basic specific gravity is 1.30, then limits can be 1.28 to 1.32.
2
Shore hardness on production samples shall be not less than 85 for class A material with
this tolerance applied.
3
Example: If first article swell of V-ring is +1 percent, then limits can be 0 to 3 percent; if
+5 percent, then limits can be 3 to 7 percent; or if +8 percent, then limits cxan be 6 to 10
percent.
3.8 Identification of product. The following general marking shall be used, unless otherwise
specified by the procuring activity.
3.8.1 V-ring packings shall have the manufacturer's trademark and the applicable size dash
number molded into the surface of the inner Vee close to the apex of the angle. If any other
marking is used, it shall be specially approved by the procuring activity. If raised figures are used,
the height shall not exceed 0.010 inch (.254mm).
Table III. - Test samples required for First Article tests
Physical Property Test
AN6225 V-ring
Tests
-20
-25
Unaged samples (table I):
Specific gravity
Tensile strength and elongation
Tensile stress (modulus)
Permanent set
Corrosion and adhesion
5
Air-aged (table I):
Tensile strength and elongation
Permanent set
Oil-aged (table I):
Tensile strength and elongation
Permanent set
Volumetric change
6
6
Subtotal (physical)
11
6
5
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