Resin Treated Compressed Wood Laminates (Compregs) - Specification, Part 3: For General Purposes

IS 3513 Part 3: Scope - Key Specifications & Properties

1. Physical Properties (Clause 8.1, Table 1)

2. Mechanical Properties (Clause 8.2, Table 2)

IS 3513 Part 3: Key References and Mechanical Properties

1. Mechanical Properties (Clause 8.2, Table 2)

2. Physical Properties (Clause 8.1, Table 1)

IS 3513 Part 3: Key Definitions, Physical & Mechanical Properties of Compreg

Definitions (Clause 3.1)

• Definitions as per IS 707:1976 apply.
• Compreg types: Type V GH, Type VI GH, Type V GM, Type VI GM.

Table 1: Physical Properties (Clause 8.1)

Table 2: Mechanical Properties (Clause 8.2)

IS 3513 Part 3: Grades and Types Summary

Grades:

• Grade GH (High Density)
  • Specific Gravity: 1.25 min to 1.35 max
  • Suitable for textile, jute mill accessories, tools, and engineering applications.
• Grade GM (Medium Density)
  • Specific Gravity: 0.95 min to 1.25 max
  • General purpose medium density material.

Types (Both Grades GH & GM):

• Four types: Type II, III, V, VI

Physical Properties (Clause 8.1, Table 1):

Notes:

• Medium Density Compreg is defined as compreg with specific gravity between 0.95 and 1.25.
• Both grades are partially impregnated materials.

flowchart LR
    A[Grades] --> B[Grade GH (1.25 - 1.35 SG)]
    A --> C[Grade GM (0.95 - 1.25 SG)]
    B --> D[Types II, III, V, VI]
    C --> D

This classification helps select the right grade/type based on density and application.

Here are the key Materials Specifications from IS 3513 Part 3 (Clauses 8.1 & 8.2):

Physical Properties (Table 1, Clause 8.1)

Mechanical Properties (Table 2, Clause 8.2)

IS 3513 Part 3: Manufacture of Compreg (Clause 6.3)

Mechanical Properties (Clause 8.2, Table 2)

IS 3513 Part 3 — Dimensions and Tolerances Summary

Key Tolerances on Finished Compreg Boards (Clause 7.1.3)

Important Notes:

• Tolerances must conform to purchaser's drawings (Clauses 7.3.1 & 6.7).
• Protective insulating varnish on edges and surfaces is mandatory (Clause 6.8), per IS 524:1983 and IS 525:1968.

Practical Application:

• Always refer to purchaser’s detailed drawings for exact tolerances.
• Use above table as default tolerance limits when drawings are not specified.
• Thickness tolerance varies significantly with thickness size, so measure carefully.

flowchart TD
    A[Start: Board Manufacture] --> B{Check Drawings for Tolerances}
    B -- Yes --> C[Apply Specified Tolerances]
    B -- No --> D[Apply Default Tolerances from Table]
    C --> E[Protect Edges and Surfaces with Insulating Varnish]
    D --> E
    E --> F[Final Inspection]

This ensures compliance with IS 3513 Part 3 requirements for dimensions and tolerances.

IS 3513 Part 3: Physical & Mechanical Properties Summary

Physical Properties (Clause 8.1, Table 1)

Mechanical Properties (Clause 8.2, Table 2)

IS 3513 Part 3: Workmanship and Finish - Key Points

1. Purchaser's Information (Clause 14.1):
The purchaser must specify:

• Number of boards/components
• Material type
• Size and thickness
• Detailed drawings with tolerances/dimensions (for components)
• Finish type: platen or machine finish
• Surface treatment: oil or varnish finish
• Any special requirements

2. Tolerances (Clause 7.3.1):

• Tolerances on finished components/blanks must follow purchaser's drawings.

3. Protective Coating (Clause 6.8):

• Edges and surfaces must have a protective insulating varnish per IS 524:1983 and IS 525:1968.

Mechanical Properties Reference (Clause 8.2 & Table 2)

• Type V and VI materials must meet mechanical properties as per Table 2 (not provided here, refer IS 3513 Part 3 Table 2 for tensile strength, flexural strength, etc.).

Summary Table: Workmanship & Finish Checklist

flowchart TD
    A[Purchaser Order] --> B[Specify Material & Size]
    B --> C[Provide Drawings & Tolerances]
    C --> D[Select Finish Type]
    D --> E[Select Surface Treatment]
    E --> F[Supplier Applies Protective Varnish]

This ensures compliance with IS 3513 Part 3 workmanship and finish requirements.

IS 3513 Part 3: Sampling Key Points

• Sampling Reference:
  Sampling is governed by IS 3513 Part 4 : 1966 (Clause 10.1). Refer to this part for detailed sampling procedures.

• Test Specimens:
  Specimens must be cut from sampled boards and tested as per methods in IS 3513 Part 4 and relevant tables (Clause 11.1).

• Physical Properties Testing (Clause 8.1, Table 1):

• Note: Specific gravity and moisture content are critical parameters for acceptance.

Summary Diagram: Sampling & Testing Flow

flowchart TD
    A[Select Boards] --> B[Sampling as per IS 3513 Part 4]
    B --> C[Cut Test Specimens]
    C --> D[Test Physical Properties]
    D --> E{Check Requirements}
    E -->|Pass| F[Accept Batch]
    E -->|Fail| G[Reject/Retest]

For full sampling details, consult IS 3513 Part 4:1966.

IS 3513 Part 3 — Key Testing Specifications

1. Physical Properties (Clause 8.1, Table 1)

2. Mechanical Properties (Clause 8.2, Table 2)

IS 3513 Part 3: Marking Specifications (Clause 12.1)

Each compreg board/component/package shall be legibly and indelibly marked with:

• Type and finish
• Manufacturer's name, initials, or recognized trademark
• Year of manufacture
• Batch number

Additional purchaser-specified marks may also be included.

Related Mechanical Properties (Table 2, Clause 8.2)

IS 3513 Part 3: Packing and Delivery Key Points

Clause 12.1: Marking Requirements

Each board/component/package must be legibly and indelibly marked with:

• Type and finish
• Manufacturer's name/initials/trade-mark
• Year of manufacture
• Batch number
• Other purchaser-specified marks

Clause 13.1: Packing and Delivery

• Boards/components must be delivered clean and dry.
• Must be suitably packed to avoid damage during transit.

Clause 14.1: Information from Purchaser

Purchaser must specify:

• Number of boards/components
• Type of material
• Size and thickness
• Detailed drawings with tolerances (for components)
• Finish type (platten/machine)
• Surface finish (oil/varnish)
• Any special requirements

Manufacturing Parameters (Clause 6.3 Table Extract)

Summary Diagram: Packing & Delivery Flow

flowchart TD
    A[Order placed] --> B[Purchaser provides info]
    B --> C[Manufacturer marks components]
    C --> D[Components cleaned & dried]
    D --> E[Components suitably packed]
    E --> F[Delivery to purchaser]

Note: Proper marking and packing ensure traceability and protection of compreg boards/components during handling and transport.

IS 3513 Part 3: Information to be Supplied by the Purchaser

Per Clause 14.1, the purchaser must provide the following details when ordering:

• Quantity: Number of boards or components
• Material: Type of material required
• Dimensions: Size and thickness
• Drawings: Detailed drawings with tolerances and dimensions for components (Clause 6.7 & 7.3)
• Finish: Specify platen or machine finish
• Surface Treatment: Oil finish or varnish finish
• Special Requirements: Any other specific needs

Additional Notes:

• Components must be delivered clean, dry, and suitably packed (Clause 13.1).
• For machined or special-shaped compreg components, detailed drawings with dimensions and tolerances are mandatory.

Summary Table for Purchaser Information

flowchart TD
    A[Purchaser Order] --> B[Quantity]
    A --> C[Material Type]
    A --> D[Size & Thickness]
    A --> E[Drawings & Tolerances]
    A --> F[Finish Type]
    A --> G[Surface Treatment]
    A --> H[Special Requirements]
    E --> I[Machined Components]
    E --> J[Special Shapes]

This ensures the supplier can deliver conforming, high-quality compreg boards or components.