General Specifications Hanna Type “A”
Scope
Hanna Type “A” is a premium grade of vegetable fiber gasket material, saturated with a glue-glycerine impregnation rendered insoluble by means of a tanning agent to give a strong, flexible, all-proof gasket material with properties retained during proper storage and in use.
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Certification
Hanna Type “A” is certified to meet the below listed specifications:
- HH-P-96G, Type 1 only (Federal Specification)
- MIL-G 12803A
- MIL-G-128030B & MIL-G-12803C
- ASTM D 1170 and SAE J90
- ASTM F 104 and SAE J90
- P3313B
- F326128M6
- P3313B
- F326128-E21 M6
Physical Characteristics
- Fiber – 45% to 55%
- Moisture – 6% to 10%
- Chemical Solids – 35% to 45%
Conditioning
All samples conditioned prior to testing as specified by applicable application – usually 50% RH-70 to 85% F for a period of 22 to 24 hours
Standards
Using American Society of Testing Materials Specification (ASTM F 104 prepared jointly with the Society of Automotive Engineers and similar in requirement to MIL-G-12803C.
Original Physical Properties
- Test Load – 1000 p.s.i.
- Compressibility – 25% to 40%
- Tensile Strength – 2000 p.s.i.
- Recovery – 40% minimum
Physical Properties After Impression
- Fuel B – Thickness increase – 5% maximum (not applicable to MIL-G-128o3C)
- #3 Oil – Thickness increase – 5% maximum
- Fuel B – Weight increase – 15% maximum (not applicable to MIL-G-12803C)
- #3 Oil – Weight increase – 15% maximum
- Water – Weight increase – 100% maximum
Thickness Tolerances
Thickness Plus or Minus
.006″, .010″ and .015″ .0035″
.021″, .031″, .046″ and .062″ .005″
.096″ (3.32″) .008″
.125″ (1/8″) and up .016
Flexibility
Hanna Type “A” is capable of withstanding bending around a rod with a diameter of twice the thickness of the material under test, without cracking, breaking, or excessive marring of the surfaces.
Temperature Limit
250° F
