Glass Fibre Base Coal Tar Pitch Outerwrap

IS 14695: Scope & Key Specifications

• Scope: IS 14695 covers specifications for glass fibre base outerwraps used in insulation systems.

• Weight Specification (Clause 5.2 & Table 2):
  For 10 m² of glass fibre base outerwraps:

  Untreated Base (kg)	Treated Base (kg)	Total Dry Weight including Surfacing (kg)
  0.4	4.5	5.5

• Rounding Off (Clause 2.4):
  Final test or analysis values must be rounded per IS 2:1960 rules, retaining the same number of significant figures as specified.

Summary:

• Ensure minimum weights as per Table 2 for compliance.
• Use IS 2:1960 rounding rules for all calculations and test results.
• The standard applies primarily to glass fibre base outerwraps in insulation.

flowchart TD
    A[Start: Glass Fibre Outerwrap] --> B[Measure Ingredients Weight]
    B --> C{Check Weight per 10 m²}
    C -->|Untreated Base ≥ 0.4 kg| D
    C -->|Treated Base ≥ 4.5 kg| D
    D --> E[Total Weight ≥ 5.5 kg]
    E --> F[Apply IS 2:1960 Rounding]
    F --> G[Compliance Confirmed]

This ensures the product meets IS 14695 requirements for insulation outerwraps.

IS 14695 - Clause 2: Normative References Summary

• Purpose: Lists standards referenced in IS 14695; these referenced standards form an integral part of IS 14695.
• Revision Note: Always check for the latest editions of referenced standards for up-to-date compliance.
• Rounding Off:
  • Follow IS 2:1960 for rounding numerical values.
  • Retain the same number of significant figures as specified in IS 14695.

Key Points for Compliance Checking:

Practical Tip:

When applying IS 14695, cross-check all referenced standards for updates to ensure full compliance.

flowchart TD
    A[IS 14695 Standard] --> B[Referenced Standards]
    B --> C[Check Latest Editions]
    A --> D[Rounding Off Rules]
    D --> E[IS 2:1960]
    E --> F[Maintain Significant Figures]

IS 14695: Materials and Composition Key Points

1. Glass Fibre Tissue (Base Membrane) - Clause 3.1 & Table 1

• Composition: Borosilicate staple glass fibres bonded with phenolic resin.
• Physical Properties:

2. Glass Fibre Outerwraps - Clause 5.2 & Table 2

• Minimum weight for 10 m²:

• Sampling method: Random selection per IS 4905; average weight calculated for 10 m².

3. Coal Tar Pitch - Clause 3.2

• Softening point: 80°C to 90°C (IS 1205)
• Penetration at 25°C: 20 to 30 (IS 1203)
• Ash on incineration at 800°C: ≤ 15% by mass (IS 1217)

4. Glass Fibre Outerwrap Properties - Clause 6 & Table 3

Summary Diagram of Material Composition

graph TD
  A[Glass Fibre Tissue] --> B[Borosilicate Glass Fibres]
  A --> C[Phenolic Resin Bond]
  D[Coal Tar Pitch

IS 14695: Physical & Mechanical Requirements Summary

1. Glass Fibre Outerwraps (Clause 6, Table 3)

2. Sampling & Conformity (Clause 7.1.3.1)

• Calculate average (X) and range (R) of breaking strength separately for wrap and weft.
• Criterion:
  [ X - 0.6R \geq \text{Specified Minimum Strength} ]
• All samples must individually satisfy pliability requirements.

3. Glass Fibre Base Outerwrap Weight (Clause 5.2, Table 2)

• Weight measured for 10 m² area.
• Sampling follows IS 4905 for randomness.

4. Coal Tar Pitch (Clause 3.2)

• Softening point: 80–90°C (IS 1205)
• Penetration at 25°C: 20–30 (IS 1203)
• Ash content ≤ 15% by mass (IS 1217)

5. Glass Fibre Tissue (Clause 3.1, Table 1)

IS 14695: Dimensions and Weight of Glass Fibre Base Outerwraps

Key Specifications:

• Weight per 10 m² (Table 2):

• Surfacing Material:

  • Sand: 2.3 kg/10 m² (Clause 2.3 c)

• Outerwrap Composition:

  • Glass fibre mat coated with plasticized coal tar enamel.
  • Dusting with mineral powder to prevent sticking.
  • Finished surface must be smooth and defect-free.

Weight Determination (Clause 5.2.1):

• Randomly select rolls as per IS 4905.
• Average roll weight → Calculate weight for 10 m².

Mechanical Requirements (Table 3):

Summary Formula for Weight per unit area:

[ \text{Weight per 10 m}^2 = \text{Base Weight} + \text{Surfacing Material Weight} ]

Where base weight and surfacing weights are as per Table 2 and Clause 2.3.

flowchart TD
    A[Glass Fibre Mat] --> B[Coated with Plasticized Coal Tar Enamel]
    B --> C[Dusted with Mineral Powder]
    C --> D[Finished Outerwrap]
    D --> E[Weight & Dimension Check]
    E --> F[Mechanical Testing]

This ensures compliance with IS 14695 for durable and standardized glass fibre outerwraps.

Key Specifications & Requirements for Glass Fibre Outerwraps (IS 14695)

1. Weight Requirements (Clause 5.2, Table 2)

• For 10 m² of outerwrap:

  Untreated Base (kg)	Treated Base (kg)	Total Dry Weight (kg) Including Surfacing
  0.4	4.5	5.5

2. Physical Properties (Clause 6, Table 3)

3. Sampling (Clause 5.2.1)

• Select rolls randomly per IS 4905.
• Compute average weight from selected rolls.
• Calculate weight per 10 m² from average.

Summary:

• Ensure minimum weight per 10 m² as above.
• Confirm breaking strength and pliability per IS 13826.
• Use random sampling as per IS 4905 for quality control.

flowchart LR
    A[Sampling per IS 4905] --> B[Select rolls randomly]
    B --> C[Measure weights]
    C --> D[Calculate average weight]
    D --> E[Verify weight ≥ specified in Table 2]
    E --> F[Conduct tests per IS 13826]
    F --> G{Pass?}
    G -- Yes --> H[Accept batch]
    G -- No --> I[Reject batch]

IS 14695: Sampling and Criteria for Conformity

Sampling (Clause 7.1.3.2 & Table 4)

Criteria for Conformity (Clause 7.1.4)

• The lot conforms if the number of defective rolls in the sample is less than or equal to the permissible number.
• Testing and inspection are conducted on selected samples (Clause 7.1.1.1).
• Sub-samples are tested for detailed properties.

Summary:

• Select sample size based on lot size (see table).
• Check defectives against permissible limits.
• If defects ≤ permissible, lot is accepted.
• Use sub-samples for detailed tests.

flowchart LR
    A[Select Lot Size] --> B{Determine Sample Size}
    B --> C[Select Rolls for Sample]
    C --> D[Test Rolls]
    D --> E{Defective Rolls ≤ Permissible?}
    E -->|Yes| F[Lot Accepted]
    E -->|No| G[Lot Rejected]

This ensures quality control by statistical sampling per IS 14695.

IS 14695: Marking and Packaging Key Points

Marking (Clause 9.1 & 9.2)

Each package must be legibly and indelibly marked with:

• Manufacturer identification
• Length, width, and weight of the roll
• Batch number (code) and date of manufacture
  Additionally, the BIS Standard Mark may be applied on each package.

Packaging Requirements

• Rolls must be clean, smooth, square cut, and free from telescoping.
• Use cardboard separators and end shields to prevent damage during stacking and transport.
• Packaging should ensure safe handling and maintain product integrity.

Quality Criteria (Clause 7.1.3.1 & Table 3)

• For breaking strength, calculate average (X) and range (R) for wrap and weft directions.
• Conformance requires:
  [ X - 0.6R \geq \text{specified minimum breaking strength} ]
• Minimum breaking strength (Table 3):
  • Wrap: 30 kg
  • Weft: 15 kg
• Pliability: No cracks on unrolling after 3 hours conditioning at 5°C; surface ruptures >5 mm = failure.

Summary Table: Marking & Packaging

flowchart TD
    A[Roll Manufacturing] --> B[Marking]
    B --> C{Marking Details}
    C -->|Manufacturer| D[Identification]
    C -->|Dimensions| E[Length, Width, Weight]
    C -->|Batch Info| F[Batch No. & Date]
    B --> G[BIS Certification Mark]
    A --> H[Packaging]
    H --> I[Clean, Smooth, Square Cut Rolls]
    H --> J[Cardboard Separators & End Shields]
    H --> K[Prevent Damage During Transport]

This ensures

IS 14695: Key Methods & Specifications for Testing Glass Fibre Tissue

1. Weight of Glass Fibre Tissue (Annex A, Clause 3.1 & 5.2.1)

• Randomly select rolls as per IS 4905.
• Weigh selected rolls; average weight represents consignment.
• Calculate weight per 10 m² from average.

2. Thickness Measurement (Fig. 1)

• Use metallic cylinder and clamp setup.
• Mount specimen without distortion.
• Measure thickness using calibrated device.

3. Tensile Strength (Fig. 2, Table 3)

4. Pliability (Clause 6, Table 3)

• Condition sample 3h at 5°C.
• On unrolling, no cracks allowed.
• Surface ruptures > 5 mm = failure.

5. Air Permeability Test (Clause A-4.3)

• Clamp specimen over orifice.
• Draw air at 1 m/s.
• Record pressure drop in mm water.
• Average over 5 specimens.

6. Temperature Resistance (Clause A-5)

• Test 5 specimens, size 25 cm × 25 cm.
• Evaluate per specified procedure.

flowchart LR
    A[Select Specimens] --> B[Measure Weight]
    B --> C[Calculate Weight per 10 m²]
    A --> D[Measure Thickness]
    A --> E[Test Tensile Strength]
    A --> F[Test Pliability]
    A --> G[Test Air Permeability]
    A --> H[Test Temperature Resistance]

This summarizes essential test methods and requirements per IS 14695 for glass fibre tissue quality control.