------------------------------------------------------ Specifications of Various Bakelite/Phenolic Materials: ------------------------------------------------------ -------------------- ------------------------ ------------------------------- GRADE Characteristics Description -------------------- ------------------------ ------------------------------- XX A hard paper reinforced Good mechanical properties, Paper base Nema XX, laminate with a phenolic high dielectric strength and LP 509, MIL P3115, resin binder. resistance in moisture. Type BPE Good machinability. XXX A paper reinforced lam- Same mechanically as XX but Paper base Nema XXX, inate with a phenolic much better electrically due LP 509, MIL P 3115, resin binder. Low loss to high resin content. Grade Type BPE electrical grade for XXX desirable for use at radio high voltage. frequencies. C A fabric reinforced lam- Tough and strong grade. Has Cotton reinforced, inate produced from cot- high impact strength, machines LP 509, MIL P 15035, ton fabric weighing over readily, and is excellent for a Type FBM 4 oz per square yard. wide variety of mechanical applications. CE Similar to grade C in Greater resistance to moisture LP 509, MIL P 15035, weight of fabric. Tough than grade C. Controlled Type FBG resilient grade for un- electrical properties. Easy usual electrical appls. to machine. Used in electrical applications requiring mech- anical strength. L A fine weave cotton fab- Has good mechanical properties. LP 509, MIL P 15035, ric reinforced with a Machines easily and clean. Type FBI phenolic binder. Fabric Used for fine pitch gears, etc. weight 40 oz per sq yd. LE Similar to grade L. For Has greater moisture resistance LP 509, Mil P 15035, fabricated parts with and improved dimensional stab- Type FBE smooth edges requiring ility. Used in rotor vanes, mechanical strength. wear strips, bearing retainers. N-1 A staple fiber nylon fab- Electrical properties of grade LP 509, Mil P 15047, ic impregnated with a XXX and toughness of grade C. Type NPG phenolic resin. Has improved insulation resist- ance. Used in HV insulators. G-9 (G-5) A continuous filament Excellent electrical strength LP 509, Mil P 15037, woven-glass fabric rein- property under wet conditions. Type GMG forced grade with melam- Excellent arc resistance. ine resin. For appls. requiring flame resist- ance and high mechanical strength. G-7 Continuous filament glass Very good dielectric loss LP 509, MIL P 997, cloth reinforcements with factor and insulation resist- Type GSG a silicone resin binder. ance under humid conditions over a wide temperature range. Excellent heat and arc resist- ance. G-10 & FR-4 Continuous filament woven Noted for excellent electrical LP 509, MIL P 18177, glass fabric grades, im- values, low moisture absorp- Type GEE pregnated with epoxy ion, and low dissipation resin. factor. G-11 Excellent electrical and Similar to G-10 with greater LP 509, MIL P 18177, machining properties with property retention at high Type GEB best dimensional stability temperatures. high insulation resistance and dielectric strength. Has high heat resistance. ---------------------------8><-------------------------------------- 73/Bob/NA4G