Qualities of Mica

 

ASTM
D-351
CLASS
FED
SPEC
HHI-536
TYPES
COMMERCIAL
CLASS
USES
INDICATOR
SCALE OF
COMPARATIVE
VALUE

Superfine

V-1

NMCi

Clear

 Microwave windows, large transmitter capacitors, special high quality TV applications, air regulating diaphragms, Geiger-Muller counter windows, metalized resistance cards, bolometers.

100

V-2

NMSs

Clear & Slightly Stained

65

Capacitor Quality

V-3

NMFs

Fair Stained

 Capacitors for radio trasmitters and general electronic purposes. Mica has low power loss and high "Q".
Capacitors for radio receivers. "Q" is slightly lower. excellent for all average applications in radio and electronic work.

45

V-4

NMGs

Good Stained

32

Radio Tube Quality

V-5

NMSA

Stained A

 High quality radio tube spacers. Lowest quality used for small capacitors.

14

V-6

NMSB

Stained B

12

Clear Electric

V-7

NMHs

Heavy Stained

 Thermostat insulators, lower quality tube spacers, fuse windows, neon electrodes, heating elements. Highest quality needed for low voltage applications.

10

Spotted Electric

V-8

NMBD

Black Dotted

 Appliances, 110/220 volt insulatio, trasformer layer insulatio.
Dots and spots are non-conductie; however mica has small amount of surface leakage.

5

V-9

NMBSp

Black Spotted

4

Stained Electric

V-10

NMBSt

Black Stained

 Motors, appliances and resistors. Stains are conducting at high oltage and more suface leakage.

3

ASTM and Federal Specifications

ASTM and Federal Specificationa may be used at any time as we are ale to furnish certificate of compliance on any products fabricated. Following are some of the applicable specificatons.

ASTM-D-351--Visual Quality - Mica
ASTM-D-748--Mica for Fixed Capacitors
HH-I-536--Visual Quality - Mica
HH-I-538--Electrical Pasted Mica

Spruce Pine Mica Company
P.O. Box 219 · Spruce Pine, N. C.  28777
Phone (828) 765-4241

info@spruce-pine-mica.com

 

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