Table 1 NEMA 9P

 

Typical Properties: (27-08-01)

Surface Rough
Operating Temperature Up to 1200F
Specific Gravity 2.1
Flexural Strength ASTM (D790) As Received 72,000 PSI
Stiffness (Gurley) (.019" Sample) 68,000 mg. Avg.
Elongation NIL
Insulation Resistance after 24 Hrs.
91% RH/30C
4.1 x 108 Ohms/Sq.
Arc Resistance (ASTM D495-61) Greater than 250 sec.
Dielectric Strength
(ASTM D149-64 Short time in air @ R.T.
2" dia. Electrodes - As Received)
650+ VPM (Avg.)
Dielectric Constant (1 megacycle) at 25C 4.5
Composition by weight (Approx.) 92% mica & 8% binder
Moisture Absorption ASTM D570 24 hour immersion: Less than 3%
48 Hrs. at 85% RH: NIL
2 Hrs. at boiling: Less than 3%
Thermal Conductiity - Perpendicular to laminates
(20C to 100C) (Cal/Cm/Cm2/Sec/Deg. C
3 x 104
Sheet Size 18" x 44"
Surface Resistance (Ohms)
(ASTM D257, 250 volts @ 1 min)
As Received: 1.9 x 1013
After Aging 24 Hrs. @ 1000F: 2.3 x 1010
Surface Resistivity (Ohms) As Received: 2.6 x 1015
After Aging 24 Hrs. @ 1000F: 3.0 x 1012
Thermal Conductivity 2.3 x 10-4 Cal/Sec/Cm2/C
(Cenco-Fitch) 0.666 BTU/Hr/Ft2/In/F

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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