San Diego Plastics -- Mykroy/Mycalex

2220 McKinley Avenue
National City CA 91950
800/925-4855 619/477-4855 FAX 619/477-4874

TYPICAL DATA ONLY

GENERAL PROPERTIES UNITS MACHINING GRADES
SHEET/ROD MOLDING GRADES

400 500 500-H 1100 410 555 1301 371 561

Specific Gravity 2.5 2.7 2.93 2.8 3.8 3.7 3.9 4.8 3.2

Density lbs./in.³ .09 .10 .106 .10 .14 .13 .14 .17 .11

Thermal Conductivity

.00100
0.24
.00120
0.29
.00161
0.39
.00140
0.34
.00120
0.29
.00130
0.31
.00125
0.30
.00136
0.31
.002
0.48

Moisture Absorption Nil Nil Nil Nil Nil Nil Nil Nil Nil

Coefficient of Thermal Expansion
(x 10^-6)
in/in/°C
in/in/°F
10.5
5.8
11.2
6.0
12.3
6.8
9.4
5.2
11.2
6.0
11.0
6.0
10.3
5.5
11.5
6.3
13.0
7.2

Specific Heat cal/gm/°C 0.12 0.12 .121 0.11 0.24 0.24 0.23 0.25 .40

Max. Continuous Operating Temp. °F
°C
750
400
750
400
800
425
1100
595
750
400
750
400
1300
700
700
370
1400
760

Flammability Does not burn

Mica Filler Natural Synthetic Synthetic Synthetic Natural Synthetic Synthetic Natural Synthetic

Radiation Resistance
(3 x 10 ¹⁰ Rads-Cobalt)
Good Better Very Good Excellent Good Better Excellent Good Good

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ELECTRICAL PROPERTIES

PROPERTIES UNITS MACHINING GRADES
SHEET/ROD MOLDING GRADES

400 500 500-H 1100 410 555 1301 371 561

Dielectric Strength V/mil 400 400 395 380 375 375 375 350 350

Arc Resistance Seconds 300 300 375 325 325 325 350 300 475

Permittivity IMHz 6.7 6.9 — 6.8 9.3/8.4 8.8/8.2 9.5/8.8 N/A 4.8

Dissipation Factor IMHz 0.0018 0.0013 .0020 0.0017 0.0012 0.0013 0.0015 0.006 0.0014

Loss Index IMHz 0.012 0.009 .016 0.012 0.0115 0.0110 0.0150 N/A .010

Surface Resistivity Dry ohm-cm (70°F) 10 ¹⁶ 10 ¹⁶ 10 ¹⁶ 10 ¹⁶ 10 ¹⁵ 10 ¹⁵ 10 ¹⁵ 10 ¹⁵ 10 ¹³

Volume Resistivity Ohm-cm (70°F) 10 ¹² 10 ¹³ — 10 ¹⁴ 10 ¹⁴ 10 ¹⁴ 10 ¹⁴ 10 ¹⁴ 10 ¹¹

Surface Resistivity Wet ohm-cm (70°F) 10 ⁶ 10 ¹⁰ 10 ¹¹ 10 ¹¹ 10 ⁹ 10 ⁹ 10 ¹⁰ 10 ⁹ 10 ⁸

Dielectric Constant IMHz 6.7 6.9 7.9 6.8 8.6 8.8 9.0 12.5 4.5

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MECHANICAL PROPERTIES

PROPERTIES UNITS MACHINING GRADES
SHEET/ROD MOLDING GRADES

400 500 500-H 1100 410 555 1301 371 561

Tensile Strength psi 6000 6000 7000 5000 6500 6000 6000 6500 7500

Flexural Strength psi 13,000 12,500 15,000 11,000 10,000 9,000 9,000 10,000 16,000

Compressive Strength psi 45,000 40,000 43,000 32,000 33,000 34,000 30,000 35,000 50,000

Modulus of Elasticity (in tension) psi 11.0 x
10 ⁶ 12.0 x
10 ⁶ 12.3 x
10 ⁶ 10.6 x
10 ⁶ 7.0 x
10 ⁶ 7.2 x
10 ⁶ 9.0 x
10 ⁶ N/A 11.3 x
10 ⁶

Hardness - Rockwell H R_H 90 90 90 90 90 90 90 90 93

Hardness - Brinell H 56 56 56 56 56 56 56 56 60

Impact Strength -IZOD (notched) Ft-lbs/in. 1.8 1.7 1.9 1.3 0.7 0.7 0.6 0.65 1.2

GLASS-MICA COMPOSITES SUMMARY SPECIFICATION-ASTM D 1039

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