Qualities & Properties of Muscovite Mica
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FED SPEC HHI 536
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ASTM D-351
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COMMERCIAL CLASS
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USES
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SCALE OF COMPARATIVE VALUE
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QUALITY: SUPERFINE
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NMC
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V-1
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Clear
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Geiger-Muller counter windows, Klystron Tubes, Microwave windows, X-Ray Analysis Instrument, Ultra-thin Mica Windows, Medical, Nuclear, Airborne.
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100
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NMS
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V-2
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Clear & Slightly Stained
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Large transmitter capacitors, bolometers, metalized resistance cards, special high quality TV applications, air regulating diaphragms
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100
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QUALITY: CAPACITOR QUALITY
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NMF
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V-3
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Fair Stained
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Low power loss and high “Q” – for radio & general electronic
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100
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| NMG | V-4 | Good Stained | “Q” slightly lower – for average radio & electronic works Mica Observation Window for Gauge Glass and Oil Burner | 100 |
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QUALITY: RADIO TUBE QUALITY
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| NMSA | V-5 | Stained A | Small capacitors and high quality radio tube spacers | 100 |
| NMSB | V-6 | Stained B | Absolutely clear fuse windows for special applications | 100 |
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QUALITY: CLEAR ELECTRIC
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| NMH | V-7 | Heavy Stained | Fuse windows, heating elements, neon electrodes, thermostat insulators, low quality tube spacers & for low voltage applications | 100 |
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QUALITY: SPOTTED ELECTRIC, STAINED ELECTRIC
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| NMBS | V-10 | Black Stained | Resistors, motors & appliances (more surface leakage & stains conduct at high voltage) | 100 |
| NMBD | V-8 | Black Dotted | 110 / 220 volt insulation, transformer layer insulation, appliances | 100 |
| NMBS | V-9 | Black Spotted | Non-conductive dots & spots (small surface leakage in mica) | 100 |
FEDERAL & ASTM Specifications
Federal and ASTM specifications may be used any time, as we are able to furnish certificate of compliance on the products fabricated.
Following are some of the applicable specifications:
| ASTM-D-351-97 : | VISUAL QUALITY MICA |
| ASTM-D-748 : | MICA FOR FIXED CAPACITORS |
| HH-I-536 : | VISUAL QUALITY MICA |
| HH-I-538 : | ELECTRICAL PASTED MICA |