Fire Blanket

IS 15381: Scope & Key Specifications for Fire Blanket (1.8 m × 1.8 m)

Scope (Clause 1.8)

• Covers material, manufacture, and other requirements of fire blankets sized 1.8 m × 1.8 m.
• References multiple related IS standards for asbestos handling, health, safety, and materials (see table below).

Material Specifications

Manufacturing & Dimension Requirements

• Stitching: 16 to 20 stitches per decimeter, neat & secure with even tension (Clause 4.3).
• Dimensions: 1.8 m × 1.8 m with ±15 mm tolerance.
• Loops: Secured by gate stitching (SS section).

Rounding Off (IS 2:1960)

• Final values must be rounded off with the same significant digits as specified.

Summary Diagram of Fire Blanket Components

graph TD
    A[Fire Blanket 1.8m x 1.8m]
    A --> B[Body: Cloth asbestos yarn (1.6 mm)]
    A --> C[Loops: Tape/Web asbestos or Cloth asbestos (1.6 mm)]
    A --> D[Stitching: Asbestos sewing thread, 

IS 15381 - References & Key Specifications Summary

Rounding Off (IS 2:1960):

• Final test/analysis values must be rounded to the same number of significant figures as specified.

Referenced Standards Table

Fire Blanket Material Specifications

Annex A - Tape/Web Asbestos (Average Width 25 mm)

Annex B - Sewing Thread Asbestos

IS 15381: Fire Blanket Materials Specifications

Key Material Components

Tape Construction Details (Annex A)

• Tape yarns are plied and twisted uniformly.
• Tape thickness and mass controlled as above.

Sewing Thread Details (Annex B)

• Test length: 20 m conditioned at 65±2% RH, 27±2°C.
• Breaking strength test: 600 mm gauge length, 300 mm/min strain rate, average of 20 specimens.

Rounding Off Rule

• Final test values rounded per IS 2:1960 to match significant figures of specified values.

Summary Table: Sewing Thread Properties

This ensures compliance with IS 15381 for fire blanket manufacture using asbestos textiles conforming to related IS standards.

IS 15381: Fire Blanket - Construction Key Details

Materials & Components

Tape/Web Asbestos (Annex A)

• Tape yarns must be twisted plies with uniform thickness.

Sewing Thread (Annex B)

• Breaking strength tested on 600 mm length at 65±2% RH, 27±2ºC, 300 mm/min stretch rate.
• Moisture and ignition loss limits ensure durability and fire resistance.

Rounding Off

• Follow IS 2:1960 for rounding test/analysis results, matching significant figures of specified values.

This ensures fire blankets meet strict material and manufacturing standards for safety and performance.

IS 15381: Dimensions and Tolerances for Fire Blankets

• Standard Blanket Size:

  • Length = 1.8 m
  • Width = 1.8 m

• Permissible Tolerance:

  • ± 15 mm in both length and width

• Stitching Specifications (Clause 4.3):

  • Stitch density: 16 to 20 stitches per decimetre
  • Stitching must be neat, secure, with even tension
  • All loose ends to be fastened off securely

• Materials:

  • Body: Cloth asbestos yarn, 1.6 mm diameter (IS 13362)
  • Loops: Tape/web asbestos or cloth asbestos, 1.6 mm
  • Stitching thread: Asbestos sewing thread (Annex B)

Summary Table: Dimensions & Tolerances

Rounding Off (IS 2:1960)

• Final test values should be rounded to the same significant figures as specified in the standard.

flowchart LR
    A[Blanket Dimensions] --> B[Length = 1.8 m ± 15 mm]
    A --> C[Width = 1.8 m ± 15 mm]
    D[Stitching] --> E[16-20 stitches/dm]
    D --> F[Secure, neat, even tension]
    G[Materials] --> H[Cloth asbestos yarn (1.6 mm)]
    G --> I[Loops: Tape/Web asbestos or cloth asbestos]
    G --> J[Stitching thread: asbestos sewing thread]

This ensures compliance with IS 15381 for fire blanket manufacture and quality control.

IS 15381: Workmanship and Finish for Fire Blankets

Key Specifications:

• Workmanship Quality:

  • Free from spinning, weaving, and stitching defects.
  • Consistent with good manufacturing practice.

• Stitching (Clause 4.3):

  • Neat and secure with even tension.
  • 16 to 20 stitches per decimetre.
  • All loose ends must be securely fastened.

• Dimensions and Tolerances (Clause 5):

  • Blanket size as per Fig. 1.
  • Tolerance: ±15 mm in length and width.

• Inspection and Sampling:

  • As per IS 7639.

• Health & Safety:

  • Follow personal protection guidelines from IS 11451, IS 11767, IS 11768, IS 11770 (Part 3), IS 12078, IS 12079, and IS 12080 for asbestos dust control.

Summary Table:

flowchart TD
    A[Raw Material] --> B[Weaving & Spinning]
    B --> C[Stitching (16-20 stitches/dm)]
    C --> D[Inspection (IS 7639)]
    D --> E[Final Fire Blanket]
    E --> F[Packaging & Dispatch]

This ensures a high-quality fire blanket meeting IS 15381 standards.

IS 15381 Sampling, Inspection, and Acceptance Key Points

• Sampling & Inspection: As per IS 15381, sampling and acceptance of asbestos fire blankets shall follow IS 7639:1975 (Methods of sampling asbestos cement products).

• Rounding Off: Test results must be rounded according to IS 2:1960 rules, retaining the same significant figures as specified.

• Material Specifications:

  • Body: Cloth asbestos, yarn per IS 13362.
  • Loops: Tape/web asbestos or cloth asbestos, 1.6 mm thick.
  • Stitching: Sewing thread asbestos per Annex B.

• Sewing Thread (Annex B):

• Tape/Web Asbestos (Annex A):

• Acceptance Criteria: The fire blanket shall be free from defects in spinning, weaving, stitching, and workmanship per good manufacturing practice.

Summary Flowchart of Sampling & Acceptance Process

flowchart TD
    A[Start: Production Batch] --> B[Sampling as per IS 7639]
    B --> C[Test & Measure per IS 15381]
    C --> D{Results within Spec Limits?}
    D -- Yes --> E[Accept Batch]
    D -- No --> F[Reject or Rework Batch]
    E --> G[Mark with BIS Certification]
    F --> G

For detailed sampling procedures, refer to IS 7639, and for rounding rules, see IS 2:1960.

IS 15381 — Marking Requirements for Fire Blankets

Clause 9.1: Mandatory Marking on Each Blanket

• Nomenclature
• Manufacturer's name
• Year of manufacture
• Pictorial warning sign as per IS 12081 (Parts 1 & 2)
• Marking must be legible and indelible

Clause 9.2: BIS Certification Marking

• Fire blankets conforming to IS 15381 may bear the BIS Standard Mark.
• Use of this mark is governed by the BIS Act, 1986.
• Conditions for license and use can be obtained from BIS.

Rounding Off Values

• Follow IS 2:1960 rules for rounding off test or analysis results.
• Maintain the same number of significant digits as specified.

Key Table: BIS Certification Marking (Clause 9.2.1)

Summary Diagram of Marking Elements

graph TD
    A[Fire Blanket] --> B[Nomenclature]
    A --> C[Manufacturer's Name]
    A --> D[Year of Manufacture]
    A --> E[Pictorial Warning (IS 12081)]
    A --> F[BIS Standard Mark (optional)]

References:

• IS 15381: Fire Blankets — Marking & Specifications
• IS 12081: Pictorial Warning Signs
• IS 2: Rules for Rounding Off Numerical Values
• BIS Act, 1986 for certification rules

This ensures traceability, quality assurance, and user safety compliance.

IS 15381: Certification Marking Key Points

1. BIS Certification Marking (Clause 9.2)

• Fire blankets conforming to IS 15381 may bear the BIS Standard Mark.
• Use of the Standard Mark is governed by the BIS Act, 1986 and related regulations.
• License conditions for use of the Standard Mark are provided by BIS.

2. Marking Details on Fire Blankets (Clause 9.1)

Each fire blanket shall be legibly and indelibly marked with:

• Nomenclature
• Manufacturer’s name
• Year of manufacture
• Pictorial warning sign as per IS 12081 (Parts 1 and 2)

3. Tape/Web Asbestos Specifications (Clause A-2)

4. Sewing Thread Asbestos (Annex B)

Notes on Testing

• Conditioning: 65 ± 2% RH and 27 ± 2ºC for 24 h (length) or 48 h (strength).
• Breaking strength tested on 20 specimens at 300 mm/min stretch rate.

Summary Diagram: Certification Marking Process

flowchart TD
    A[Manufacture Fire Blanket] --> B[Conform to IS 15381]
    B --> C[Mark with Required Info]
    C --> D[Apply BIS Standard Mark]
    D --> E[License Compliance Checked]
    E --> F[Market Product]

For detailed licensing info, contact BIS regional offices listed in the standard.

IS 15381: Tape/Web Asbestos - Key Specifications & Details

1. Tape/Web Asbestos Construction (Clause 4.2)

• Two loops per blanket, each 25 mm wide.
• Loops made from:
  • Tape asbestos (per Clause 3.1(iii)), or
  • Folding and top-stitching a 70 mm wide asbestos cloth (cut warp-wise).
• Loops sewn on one side of the blanket.
• Loop placement: 630 mm from each corner.
• Total strip length per loop: 760 mm, with 460 mm forming the loop.

2. Tape/Web Asbestos Properties (Clause A-2)

• Yarns must conform to IS 13362 (Asbestos yarn standard).

3. Sewing Thread Asbestos (Annex B)

• Conditioning: 65 ± 2% RH, 27 ± 2°C for 24 h.
• Breaking strength test: 600 mm gauge length, 300 mm/min strain rate.

4. Summary of Materials for Fire Blanket (1.8m × 1.8m)

flowchart TD
    A[Blanket Body]

IS 15381: Particulars of Sewing Thread Asbestos (Annex B)

Testing Conditions:

• Length per unit mass: Minimum 20 m thread, conditioned at 65 ± 2% RH and 27 ± 2°C for 24 h.
• Breaking strength: Test piece length to allow 600 mm clear between grips, conditioned 48 h at above conditions, stretched at 300 mm/min. Average of 20 specimens.

Tape/Web Asbestos (Annex A - A-2 Construction Details):

• Yarns conform to IS 13362.

Summary:

• Sewing thread asbestos is 2-ply, strong (≥3 kg breaking strength), moisture controlled (≤4%), and heat stable (≤45% loss on ignition).
• Tape/web asbestos is 25 mm wide, with specific thread counts and mass.
• Conditioning at 65% RH and 27°C is critical for testing consistency.

flowchart LR
    A[Asbestos Yarn IS 13362]
    B[Tape/Web Asbestos]
    C[Sewing Thread Asbestos]
    D[Fire Blanket Body]
    E[Loops (Tape or Cloth)]
    F[Stitching (Sewing Thread)]

    A --> B
    B --> E
    C --> F
    D -->|Made from| A
    E -->|Attached to| D
    F -->|Stitches Loops| D

This ensures fire blankets meet durability, fire resistance, and manufacturing quality requirements per IS 15381.