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IS 3513:2000 (Part 2) is the Indian Standard (BIS) for resin-treated compressed wood laminates (compregs) - specification, part 2: for chemical purposes. This standard specifies the requirements and testing methods for resin-treated compressed wood laminates (compregs) used for chemical purposes, ensuring high density, mechanical strength, and resistance to chemical degradation.
Resin-treated compressed wood laminates (compregs) - Specification, Part 2: For chemical purposes
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Wood and Other Lignocellulosic Products
Specification for non-impregnated densified laminated wood for electrical purposes - Part 3-1: Specifications for individual materials - Sheets
Provides specific property requirements for sheet-form densified wood, directly comparable to IS 3513's grades.
EN 61061-1:2004European Committee for Electrotechnical Standardization (CENELEC), Europe
HighCurrent
Specification for non-impregnated densified laminated wood for electrical purposes - Part 1: Definitions, designation and general requirements
The European regional adoption of the IEC 61061-1 standard, making it the equivalent for the European market.
Key Differences
≠IS 3513 uses a simple three-grade system (CEW 1, CEW 2, CEW 3), whereas the IEC 61061 series uses a more detailed designation based on wood type (e.g., Beech 'B', Hornbeam 'F') and property profiles.
≠The minimum flexural strength required by IEC 61061-3-1 for its comparable types (e.g., ≥250 MPa) is significantly higher than that for the highest IS grade, CEW 1 (≥175 MPa).
≠IS 3513 specifies a more stringent requirement for insulation resistance after water immersion (≥ 1 x 10³ MΩ) compared to the IEC standard (≥ 1 x 10² MΩ for similar types).
Key Similarities
≈Both standards define materials made from wood veneers (typically beech) bonded under high pressure and heat with thermosetting phenolic resins, intended for electrical insulation.
≈The requirements for electric strength perpendicular to laminations when tested in hot oil (90 °C) are virtually identical, with both standards specifying values around 4.0 kV/mm for a 3mm thickness.
≈Both standards specify similar testing regimes and property requirements for dimensional stability, including comparable limits for water absorption and oil absorption.
≈The primary application specified in both standards is for manufacturing insulating components in oil-filled electrical equipment like transformers, such as clamping rings, spacers, and lead supports.
Parameter Comparison
Parameter
IS Value
International
Source
Density
1.25 to 1.35 g/cm³
1.30 to 1.40 g/cm³ (for Type DW-B)
IEC 61061-1:2004
Flexural Strength (Flatwise, highest grade)
≥ 175 MPa (Grade CEW 1)
≥ 250 MPa (Type DW-B 203.1)
IEC 61061-3-1:2006
Compressive Strength (Perpendicular to laminations)
≥ 250 MPa (Grade CEW 1)
≥ 250 MPa (Type DW-B 203.1)
IEC 61061-3-1:2006
Electric Strength (Perpendicular, 3mm thick, in oil @ 90°C)
≥ 4.0 kV/mm (Grade CEW 1)
≥ 4.0 kV/mm (Type DW-B 203.1)
IEC 61061-3-1:2006
Insulation Resistance (after 24h water immersion)
≥ 1 x 10³ MΩ
≥ 1 x 10² MΩ (Type DW-B 203.1)
IEC 61061-3-1:2006
Water Absorption (3mm thick, 24h immersion)
≤ 30 mg for 25x25mm specimen (approx. 1.2% by mass)
≤ 1.5% by mass
IEC 61061-3-1:2006
⚠ Verify details from original standards before use
Key Values3
Quick Reference Values
Specific gravity, Min1.20
Moisture content, Max6%
Water absorption (24 hours), Max2.0%
Tables & Referenced Sections
Key Tables
Table 1 - Physical and Mechanical Properties of Compregs
Table 2 - List of Reagents for Chemical Resistance Tests
A compreg is a wood laminate made by impregnating veneers with synthetic resin (usually phenolic) and curing under high heat and pressure to greatly increase density and chemical resistance.
What are the typical applications for Part 2 laminates?+
They are specifically used for manufacturing chemical vats, filter press frames, and specialized industrial flooring where chemical exposure is prevalent.
How is chemical resistance evaluated under this IS code?+
Test specimens are immersed in specified chemical reagents for a set duration, after which they are evaluated for changes in weight, thickness, and visible degradation.