Glass Epoxy Laminates

GRADE : NEMA – FR-4
SHEET SIZE : 2135 mm X 1220 mm / 1220 mm X 1066 mm
THICKNESS RANGE : 0.2 mm – 40 mm
DESCRIPTION : This grade exhibits extremely high mechanical strengths (flexural, impact and bonding) at room temperature. Good Dielectric loss and electric strength properties under both dry and humid conditions.

 

Sr. No PROPERTIES ASTM TEST METHOD UNITS CONDITION SPECIFICATION TEST RESULTS
1 Specific Gravity ---- ---- A ---- 1.90
2 Water Absorption (max) D229 % D-24/23 0.8 mm – 0.5%
1.2 mm – 0.4%
1.6 mm – 0.25%
2.4 mm – 0.2%
3.0-5.0mm – 0.15%
0.8 mm – 0.4%
1.2 mm 0.3%
1.6 mm 0.18%
2.4 mm 0.15%
3.0-5.0 mm – 0.12%
MECHANICAL PROPERTIES
1 Tensile Strength L.W.
(12mm thick) C.W.
D229 PSI A 40,000
35,000
42,000
36,000
2 Impact Strength
A. lzod L.W.
()32 – 25mm thick) C.W.
D229 PF CP204 A 7.00
5.50
7.8
5.75
3 Flexural Strength L.W.
(0.8 – 2.4mm thick) C.W.
D229 PSI A 55,000
45,000
62,000
53,000
4 Bonding Strength (12mm thick) D229 Lbs A
D/48/50
2,000
1,600
2,200
1,800
ELECTRICAL PROPERTIES
1 Minimum Breakdown Voltage
Edge Wise (0.8 – 25mm)
229 KV A
D-48/50
45
40
50
45
2 Electric Strength (perpedicular to lamination) – (1.5mm thick) D229 ---- In oil at
90 C
15 20
3 Maximum Permittivity / 1MHZ (1.5mm thick) D229 ---- A
D24/23
5.20
5.40
5.12
5.25
4 Insulation Resistance after (Immersion in water for 24 hours) D229 M Ω C – 96/35/90 200,000 300,000
5 Maximum Dissipation ---- ---- A 0.025 0.02
6 Factor/MHZ (1.5mm thick) ---- ---- D-24/23 0.035 0.03
THERMAL PROPERTIES
1 Temperature Index VDE 0304/2 C ---- 130 130
2 Insulating class IEC Publ.85 C ---- B B
3 Flammability UL94 Class A V0 V0
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