Glass Cloth, NOMEX® y DMD, Epoxi resin impregnated (Pre-Preg)
Pre-preg glass cloth, impregnated with epoxy novalac resin, permits molding materials which are compliant with a great variety of international standards such as G – 10 and G – 11 ASTM D-709. It is used to produce base plates of printed circuits, wedges and shims for generators, insulating tubes and all kinds of tooling parts which require good F-type mechanical and electrical resistance.
They are impregnated to pre-preg all kinds of cloth, varying their type and weight according to the final product. (fine 180 f/m2 cloth up to roving cloth of 660 g/m2 )
We have recently added vynil-ester resins mainly for anticorrosion applications. The product comes in separate rolls with polyethylene film, of approximately 1-metre width and varying lengths according to product weight (between 25 and 50 meters)
S.M.C. (SHEET MOULDING COMPOUND)
Description
Pre-preg moulding material which is made up of fiberglass and polyester resin together with special filler, moisturizing additives, suface-active colors and catalyzers for its formation under pressure and temperature.
Physical Properties
|
Unit load of traction rupture |
ASTM D638 |
900 KG/CM² |
|
Unit load of compression rupture |
ASTM D695 |
1000 KG/CM² |
|
Unit load of buckling rupture |
ASTM D790 |
700-800 KG/CM² |
|
Impact strength |
ASTM D256 |
20 KG/CM² |
|
Resistivity |
DIN 53482 |
1 X 10 (15) |
|
Dielectric constant (50 Hz) |
DIN 53483 |
5.6 |
|
Dissipation factor (800 Hz) |
DIN 53483 |
0.005 – 0.4 |
|
Dielectric strength |
ASTM D149 |
10 – 12 KV/MM |
|
Resistance to surface currents |
DIN 53480 |
T 5 |
|
Arching resistance |
ASTM D495 |
90 S |
|
Heat Dimensional Stability (Martens) |
DIN 53458 |
130º C |
|
Combustion resistance |
DIN 53459 |
4th Grade |
|
Water absorption at 20ºC |
ASTM 570 |
0.7 % |
Units
1200mm wide rolls, 25 to 30m long.