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BMS 8-139 is a Boeing specification covering glass fabric reimpregnated high-temperature-resistance epoxy resins (prepregs).
It is closely linked to BMS9-3, which covers the fabric reinforcement linked with its products.
This specification covers high temperature prepregs, unlike BMS 8-79, which covers low temperature prepregs.
Class refers to properties required of the prepreg and cured laminate, and determines application locations.
When no Class is specified, Class 1 shall be used.
a. Class 1 (obsolete designation is Class I) material is not intended to be used inside the pressure shell of the airplane. It is not required to meet flammability properties. Class 1 reinforcement fabric meets the requirements of BMS9-3.
b. Class 2 (obsolete designation is Class II) material is intended for possible use inside the pressure shell of the airplane. It is required to meet flammability properties. Class 2 reinforcement fabric meets the requirements of BMS9-3.
c. Class 3 (obsolete designation is Class III) material is intended for use in areas requiring material which only meets the prepreg physical and hydraulic fluid resistance requirements. Class 3 material is not intended for use inside the pressure shell of the airplane. Class 3 reinforcement fabric meets the requirements of AMS 3824 or MIL-Y-1140.
The style is based upon the fabric reinforcement used.
| Designation | Fabric Reinforcement | Obsolete Designation |
|---|---|---|
| Style 120 | BMS9-3, Type D, Style 120 | Type 120 |
| Style 1581 | BMS9-3, Type H-2, Style 181-150 | Type 181 and 1581 |
| Style 7781 | BMS9-3, Type H-3, Style 181-77 | Type 7781 |
| Style 1582 | BMS9-3, Type J-2, Style 182-150 | Type 182 and 1582 |
| Style 1584 | BMS9-3, Type K-2, Style 184-150 | Type 184 and 1584 |
| Style 1543 | BMS9-3, Type F-2, Style 143-150 | Type 183 and 1583 |
| Style 108 | AMS 3824 or MIL-Y-1140, Style 108 | None |
| Style 220 | BMS9-3, Type D-1, Style 220 | None |
