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British Standard BS 476 Part 6 Fire Test Approved Class 0 Fire Rating Insulation

BS 476 refers to the British standards for fire tests on building insulation materials and structures which approves class 0 or class 1 fire rating. This test standard is split into two parts: Part 6 and Part 7.

Part 6 specifies a method of test for providing a comparative measure of a flat material or assembly's contribution to the growth of a fire. It takes into account the combined effect of factors such as

  • ignition characteristics
  • amount and rate of heat release, and
  • thermal properties of the product in relation to its ability to accelerate the rate of fire growth.

How is Part 6 tested?

The setup: A combustion chamber containing a horizontal gas burner tube and two electrical heating elements is placed below a removable steel chimney and cowl (specimen holder).

The sheet sample is placed into the specimen holder and clamped onto the combustion chamber such that the face of the sample is in contact with the walls of the combustion chamber.

The procedure: The sample is subjected to flame and heat from the heating element for 20 minutes.

The result: Temperature measurements are taken frequently throughout the test and values are used to calculate the fire propagation index, I and sub-indices i1, i2 and i3. The higher the fire propagation index, the greater the influence of the product on accelerating the growth of a fire.

 

What does this mean for my project?

Materials that conform to BS476 could ensure the overall safety of building occupants in the event of a fire incident.

If Class 1 classification is required, look out for materials that have been tested according to BS 476 Part 7.

If Class 0 classification is required, the material must either:

  • Be composed throughout of materials of limited combustibility, or
  • Tested to be a Class 1 material (classified if the material passes the Part 7 test) AND passes the Part 6 test where it has a fire propagation index (I) of not more than 12 and sub-index (i1) of not more than 6.
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More on safety standards

Armacell Know-how // BS 476 Part 7

BS 476 refers to the British standard for fire tests on building materials and structures. Part 7 specifies the test method for measuring the lateral spread of flame along the surface of a test specimen. During the test, the measurements recorded include... Read more

Armacell Know-how // BS476 Part 6

BS 476 refers to the British standard for fire tests on building materials and structures. Part 6 specifies a method of test for providing a comparative measure of a flat material/assembly's contribution to the growth of a fire. It takes into account the combined effect of factors such as... Read more

Armacell Know-how // FM 4924

The FM approval is an approval requirement for insulation material used on the exterior of non-combustible pipes or ducts. This standard uses a full-scale test for pipe and sheet insulation. Tests in this standard are different from the BS 476 standard as... Read more

Armacell Know-how // NFPA 274

The NFPA 274 Standard Test Method is a full-scale test that uses large samples to simulate how insulated pipes in a confined vertical configuration may behave during a growing fire situation. It may be a more realistic assessment as it reflects the actual... Read more

Armacell Know-how // NFPA 274

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Contact Form for Armacell India

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BS476 Part 6 test equipment
BS476 Part 6 test equipment

British Standard BS 476 Part 6 Fire Test

BS 476 refers to the British standard for fire tests on building materials and structures. This test standard is split into two parts: Part 6 and Part 7.

Part 6 specifies a method of test for providing a comparative measure of a flat material or assembly's contribution to the growth of a fire. It takes into account the combined effect of factors such as

  • ignition characteristics
  • amount and rate of heat release, and
  • thermal properties of the product in relation to its ability to accelerate the rate of fire growth.

How is Part 6 tested?

The setup: A combustion chamber containing a horizontal gas burner tube and two electrical heating elements is placed below a removable steel chimney and cowl (specimen holder).

The sheet sample is placed into the specimen holder and clamped onto the combustion chamber such that the face of the sample is in contact with the walls of the combustion chamber.

The procedure: The sample is subjected to flame and heat from the heating element for 20 minutes.

The result: Temperature measurements are taken frequently throughout the test and values are used to calculate the fire propagation index, I and sub-indices i1, i2 and i3. The higher the fire propagation index, the greater the influence of the product on accelerating the growth of a fire.

Our recommended Class 0 Solutions
Armaflex_CO_Range.jpg
CLASS 0 ARMAFLEX®
Armaflex_COP_Range.jpg
CLASS 0 ARMAFLEX® PLUS
Armaflex_Alu_Range.jpg
ARMAFLEX® ALU
Armaflex_Alu_E_Sheet.jpg
ARMAFLEX® ALU E
Acoustic Insulation Material
ARMASOUND® SUPER SILENCE DUCTLINER
ArmaChek_GC_Range__New_.jpg
ARMA-CHEK® GC
Arma-ChekSilver_sheets_pre-covered_HG_4c.jpg
ARMA-CHEK® SILVER
Armafix_Class_O_Range.jpg
ARMAFIX® CLASS 0
Armaflex_Ductseal_Adhesive__5_lts_.jpg
ARMAFLEX® DUCTSEAL
Contact us

Contact Form for Armacell India

Contact Form for Armacell India

 

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