|
| PRODUCT TRADE NAME |
ABRON - BR 720
|
| PRODUCT TYPE |
POLYIMIDE RESIN (Bis-malimide based)
|
Typical Physical Properties of ABRON BR 720
| RESIN Uncured Resin |
Appearance
Melting point(0C)
DSC Exotherm peak
temperature,(0C)
Bulk polymerization energy, J/g |
Yellow
~ 80 - 900C
2600C
> 1800C
|
| CURED RESIN |
Colour
Mechanical Properties
Tensile strength, psi
Tensile modulus, psi
Flexural strength, psi
Flexural modulus, psi
Flexural strain to failure, % Fractural energy, in.-ib/in.2
Glass transition temperature, 0C |
Brown
6-12 x 103
6-7 x 105
11-21 x 103
5-7 x 105
1.3-2.3
0.14-0.19
230-290
|
PROPERTIES OF ABRON BR-720 LAMINATES
| Testing Standard |
BS 3953 PI - 1 |
| Reinforcement |
Glass Fabric |
| Resin |
Polyimide |
| Colour |
Dark Brown |
Mechanical Properties
| Felxural Strength (ISO 178), |
1 2000C
|
500 MPa 360 MPa |
| Modulus of Elasticity (ISO178) |
1
|
25,000 MPa |
| Compressive Strength (ISO 604) |
1
|
650 MPa |
| Izod Impact Test (ISO 180/2A) |
1
|
55 kj/n2 |
| Shearing Strength (EN 60893-2) |
1
|
70 MPa |
| Tensile Strength (ISO 527) |
1
|
300 MPa |
Electrical Properties
| Electric Strength (IEC 243-1) |
2
|
20 kv/mm |
| Permittivity (IEC 250) |
3
|
4.0 at 50Hz. |
| Dissipation Factor (IEC 250) |
3
|
0.01 at 50 Hz. |
Insulation systems (IEC 167)
|
4
|
1000 M ? |
| Comparitive Tracking Index (IEC 112) |
1
|
250 CTI |
PHYSICAL AND THERMAL PROPERTIES
|
Thermal Indurance Index, 20,000 hrs. (IEC 216)
|
-
|
180 - 2400C |
Flammability (IEC 707)
|
1
|
FV 0 |
Density (IEC 1183-A)
|
1
|
1.95 gm/cm3 |
Water absorption (IEC 62-1)
|
4
|
15 mg. |
Conditioning:
- 24h/230C/ 50% RH.
- 24h/230C/50% RH + 1h in oil at 900C.
- 96h/1050C + 1h/230C/20% RH.
- 24h/500C + 24h in water at 230C.
- 96h/1050C + 1h in oil at 900C.
GENERAL METHOD OF PREPARATION OF LAMINATES
- Prepare a 45 - 50 % solution of ABRON BR720 in dry NMP/ DMF/ DMAc.
- Use this solution to impregnate glass-fiber fabrics and then dry at 1600C for 10 minutes to obtain a B-stage prepreg.
- Stack required number of the B-stage prepregs between aluminium foils / mylar sheets.
- Place the stack between heated press plates at a temperature of 1200C.
- Immediately apply a pressure of 210 psi to 800 psi depending upon the thickness.
- Increase the temperature progressively to 1800C in 30 minutes for stack not thicker than 3/8 in.
- Cure the laminate at 1800C for 1 -2 hrs.
- Remove the laminate from the hot press at 1000C and post cure it for 16 - 24 hours at 2500C.
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