IS 3513 (Part 1) : 1989
Resin treated compressed wood laminates Resin treated compressed wood laminates (compregs) – For electrical purposes
1. Summary about Resin Treated Compressed Wood Laminates (Compregs) – For Electrical Purposes
These laminates are manufactured by impregnating compressed wood with resin to produce high-strength electrical insulating materials. They are used in transformers, switchgear, and electrical panels.
2. Why BIS Certificate is Mandatory for Compregs for Electrical Purposes
BIS certification is mandatory to ensure electrical insulation performance, mechanical strength, and resistance to heat and moisture. Failure can lead to electrical hazards.
3. What is BIS Certified for Resin Treated Compressed Wood Laminates – Electrical Purposes
BIS certification verifies compliance with Indian Standards covering dielectric strength, mechanical properties, moisture resistance, and dimensional stability.
Tests required for Resin Treated Compressed Wood Laminates (Compregs) – Electrical Purposes
| Title | Mandatory/Optional |
|---|---|
| Timber | Required |
| Synthetic Resin | Required |
| Solvents | Required |
| Varnishes | Required |
Dimension and Tolerances
| Title | Mandatory/Optional |
|---|---|
| Boards | Required |
| Rods | Required |
| Specific Gravity | Required |
Physical properties
| Title | Mandatory/Optional |
|---|---|
| Specific Gravity | Required |
| Moisture content and volatile matter | Required |
| Water absorption | Required |
| Sporadic working temperature | Required |
Electrical Properties
| Title | Mandatory/Optional |
|---|---|
| Insulation resistance after in water | Required |
| Volume and surface resistivity | Required |
| Flatwise electric strength in oil | Required |
| Edgewise electric strength in oil | Required |
| Power factor | Required |
| Comparative tracking index for varnished components | Required |
| Clause 8.2.1 of IS 3513 (part 1) | Required |
Mechanical Properties
| Title | Mandatory/Optional |
|---|---|
| Tensile Strength | Required |
| Static Bending Strength | Required |
| Compressive Strength: Parallel to laminae & Perpendicular to laminae | Required |
| Shear Strength: Parallel to grain and laminae (edgewise) & Perpendicular to grain and perpendicular to laminae (flatwise) | Required |
| Impact strength (unnotched sample): Perpendicular to laminae & Parallel to laminae | Required |
| Hardness (Rockwell H Scale) | Required |
| Workmanship and finish | Required |
4. Benefits of BIS Certification for Compregs – Electrical Purposes
- Ensures reliable electrical insulation
- Mandatory for electrical equipment use
- Improves safety and performance
- Reduces risk of electrical failure
- Enhances acceptance by utilities and manufacturers