Quick View
Please note - We regret to inform you that our phone line is currently unavailable. Our team is working to resolve the issue as quickly as possible. In the meantime, we have set up an alternative phone line +44 1675 628652. We apologize for any inconvenience this may cause and appreciate your patience. Thank you for your understanding.
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 |
