MIL-PRF-87895A(USAF)
2.4
Order of precedence.
In the event of a conflict between the text of this document and the references cited herein, the
text of this document takes precedence. Nothing in this document, however, supersedes
applicable laws and regulations unless a specific exemption has been obtained.
3.
REQUIREMENTS
3.1
First article.
When specified (see 6.2), a sample shall be subjected to first article inspection in accordance
with 4.2.
3.2
Materials.
The material shall be composed of two parts: a base, Part A, and a plasticizer, Part B. Part A
shall consist of a pure amorphous polypropylene hot melt thermoplastic, conforming to the
requirements specified in table I, and Part B shall consist of an Isobutylene-butene copolymer
(commonly known as polybutenes) conforming to the requirements specified in table II.
TABLE I. Part A, base characteristics.
CHARACTERISTIC
REQUIREMENT
INSPECTION
Specific gravity at 73°F
.86±.04
4.5.1
Viscosity at 375°F
3500±500 centipoises
4.5.2
295±5°F
Softening point
4.5.3
500°F min
Flash point
4.5.5
500°F min
Fire point
4.5.5
Volatile content
.5% max
4.5.6
Ash content
.5% max
4.5.7
Acidity
.1% max
4.5.8
-40°F min
Glass transition temperature
4.5.13
TABLE II. Part B, plasticizer characteristics.
CHARACTERISTIC
REQUIREMENT
INSPECTION
.91 ±.04
Specific gravity
4.5.1
Viscosity at 210°F
3200 ±200 centipoises
4.5.2
450°F min
Flash point
4.5.5
500°F min
Fire point
4.5.5
Acidity
0.1% max
4.5.8
-65°F min
Glass transition temperature
4.5.13
3
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