TM 1-1500-204-23-6 Table 5-1.  Identification of Plastic Materials - CONT Commercial Current designation specification Form Grade and Intended use Plastic Sheet, MIL-P-15037 Sheets Glass-Cloth, Melamine-Resin, Laminated, General Purpose (Type GMG) Thermosetting, Plastic Thermosetting Sheet Glass-Cloth, Material Primarily for Electrical Melamine-Resin Insulating Purposes Plastic-Material MIL-P-15047 Sheets For Use In Electronic Applications Laminated, Requiring Moisture Resistance, But Thermosetting, Not Heat, Flame, and Arc Resis- Sheets, Nylon- tance.  Severe Decrease in Flexural Fabric-Base, Strength Occurs at Temperatures Phenolic-Resin Above 76°C (167°F). Plastic-Material L-P-387 Sheets Type GCP-F-Flexible, Stampable Laminated, Type GCP-Heat-Resistant Thermosetting Type NDP-For Engraving (For Designation Type HSP-Heat-Resistant, for Plates) Surface Marking Plastic Sheet, MIL-P-8257 Sheets Finish A-Glazing Applications in Thermosetting, Noncombat, Nonpressurized Air- Transparent craft, and as a Surface Sheet for Transparent Laminated Assemblies Where Crazing Resistance is Important and Limited Formability Can Be Tolerated Finish B-Primary for Use in Ribs or Reinforcing Strips for Parts Fabricated on Finish A Material. Plastic, Self- MIL-P-8045 Sheets Class A-For Use With Self- Sealing Tank Sealing Fuel Tanks Backing Material, Class B-For Use With Self- Temperature and Sealing Oil Tanks. Water-Resistant Type I -Intermittently Supported. Type Il -Continuously Supported Type Ill - lntermittently Supported and Fastened to the Supporting Stringers Plastic-Material L-P-511 Sheets The Laminated Plastic Sheet is Laminated, Intended for Forming into Com- Thermosetting pounds Shapes for Mechanical Sheets, Cotton- Applications on Aircraft Not Fabric-Base, Intended for Electrical Insulation Post-Forming Applications. 5-3