TM 1-1500-204-23-6
CAUTION
•
Do not store plastic materials near heating coils, radiators, hot water, or steam pipes.
Damage to equipment may otherwise result
•
Stack small sheets on larger sheets to prevent unsupported overhanging.
(1) Sheets. Store plastic sheets, with masking paper in place, in bins which are tilted approximately 1-degree
from vertical to prevent buckling. When necessary to store sheets horizontally, use extreme care to prevent any dirt or
other foreign objects from getting between the sheets. Do not stack sheets over 18 inches high.
(2) Formed section. Store formed sections so they will be amply supported and have no tendency to lose their
shape. Avoid vertical nesting. Do not store in any location where the temperature exceeds 120 °
F (49°C). Protect
formed section from scratches by applying a protective coating, Military Specification MIL-C- 6799, at least 0.009 inch
thick. A layer of cheesecloth, Federal Specification CCC-C-440, should be embedded in the coating to facilitate removal.
Table 5-1. Identification of Plastic Materials
Commercial
Current
designation
specification
Form
Grade and Intended use
Plastic Sheet,
L-P-513
Sheets
Type PBG-General Purpose Grade
Laminated,
Type PBE-Electrical Grade
Thermosetting,
Type PBE-P-Electrical Grade;
Electrical Insulating,
Punching Stock-Better Electrical
Paper-Base
Characteristics Than Obtained
Phenolic-Resin
With Phenolic-Resin, Cotton-
Base, But Sacrifice in Regard to
Impact Strength.
Plastic-Material
MIL-P-997
Sheets
Specification Covers Type GSG,
Laminated, Thermo-
Class H Plastic Insulating
setting, Electrical
Material Having Fire and Electrical -
Insulating, Sheets
Arc Resistance, Heat
Glass-Cloth, Sili-
Resistance, and Very Good Electrical -
Resin
Resistance and Dielectric
Loss Characteristics.
Plastic Sheet,
MIL-P-15035
Sheets
Type FBM-Mechanical Grade
Laminated,
Type FBG-General Purpose Grade
Thermosetting,
Type FBE-Electrical Grade
Cotton-Fabric-
Type FBI-For Fine Machining
Base, Phenolic-
Applications for Electrical
Resin
Insulating and Mechanical Purposes,
When a Greater Mechanical
Strength is Required Than Can Be
Obtained with Phenolic-Resin
Paper-Base Laminated, But With
Some Sacrifices in Electrical
Characteristics.
5-2
