Table 1 NEMA 9P

 

Typical Properties: (27-08-01)

Surface Rough
Operating Temperature Up to 1200°F
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/30°C
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 25°C 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
(20°C to 100°C) (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. @ 1000°F: 2.3 x 1010
Surface Resistivity (Ohms) As Received: 2.6 x 1015
After Aging 24 Hrs. @ 1000°F: 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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