CARPET FLAMMABILITY TEST

PRESENTED BY –

INDIAN INSTITUTE OF CARPET TECHNOLOGY BHADOHI

British Standard (BS) 4790-1987 effects of a small source of ignition on

Floorcoverings carpet.

Scope:

• The British Standard describes a method for the determination of the effects of a

small source of ignition on textile floor covering using a hot metal nut method.

• It is applicable to all types of textile floor coverings whether loose-laid or fully

adhered and used with or without an underlay.

Principle

• A stainless steel nut heated at 900° C is placed on the use surface of the test material

and the greatest radius of the effects of ignition from the point of application of the

nut is measured on both use-surface and under surface.

• 35 mm or less can be described as ‘low radius effects of ignition’ and indicates that

the material is ignited from a small source.

• 35 mm and up to 75 mm –’medium radius of ignition’ and indicates will spread flame

to a limited extent only.

• >75 mm –’ high radius of effects of ignition’ indicates the material will ignite and

may continue to spread.

Apparatus Used

Test Chamber

Muffle Furnace

Hexagonal nut

• Clamping ring

Tong

• Circular scale

Transparent grid,

Stop watch

Procedures of testing

• First of all taken three sample whose size is 300 mm x 300 mm, including any

backing.

• Place the test specimen on the floor of the chamber in loose-laid condition.

• After that placing the Hexagonal nut by the help of clapping ring on top of the

specimen press down firmly for 30 Sec.

• Finally calculate the radius of ignition by the help of circular scale.

Sample specification

• Cut the carpet sample by the cutting template.

• Sample size of the carpet is 300mm × 300 mm.

• Three sample is tested.

• Standard atmosphere

RH – 65±2% & Temp. – 20±2°C

• Conditioning time – 24 hour

OBSERVATION TABLE:

Mulberry Red

Eric Golden

Vanya Black

Turkish Mulberry Red (T.M.R)

Sl. No. Parameters Test 1. Test 2. Test 3. Requirement(mm)

1 Radius of the

affected area on

use surface side

(mm)

23 24 23

2 Radius of the

affected area on

under surface

side (mm)

Nil Nil Nil

3 Greatest Radius

of the affected

area (mm)

24≤ 75

4 Rime of Ignition

of reach the

clamping ring

(Sec.)

Nil Nil Nil

5 Flame Extension

time (Sec.)

Nil Nil Nil

6 Duration of

afterglow or

smouldering

time(Sec.)

25Sec 20Sec 18Sec

7 Burn Code

I/DNI)

Ignited Ignited Ignited

Remarks: Results of the specimen is satisfactory

Turkish Eric Golden (T.E.G)

Sl. No. Parameters Test 1. Test 2. Test 3. Requirement(mm)

1 Radius of the

affected area on

use surface side

(mm)

23 24 23

2 Radius of the

affected area on

under surface

side (mm)

Nil Nil Nil

3 Greatest Radius

of the affected

area (mm)

24≤ 75

4 Rime of Ignition

of reach the

clamping ring

(Sec.)

Nil Nil Nil

5 Flame Extension

time (Sec.)

Nil Nil Nil

6 Duration of

afterglow or

smouldering

time(Sec.)

18Sec 12Sec 12Sec

7 Burn Code

(I/DNI)

Ignited Ignited Ignited

Remarks: Results of the specimen is satisfactory

Turkish Vanya Black (T.V.B)

Sl. No. Parameters Test 1. Test 2. Test 3. Requirement(mm)

1 Radius of the

affected area on

use surface side

(mm)

18 17 18

2 Radius of the

affected area on

under surface

side (mm)

Nil Nil Nil

3 Greatest Radius

of the affected

area (mm)

18≤ 75

4 Rime of Ignition

of reach the

clamping ring

(Sec.)

Nil Nil Nil

5 Flame Extension

time (Sec.)

Nil Nil Nil

6 Duration of

afterglow or

smouldering

time(Sec.)

30Sec 27Sec 29Sec

7 Burn Code

(I/DNI)

Ignited Ignited Ignited

Remarks: Results of the specimen is satisfactory

Percian Mulberry Red (P.M.R)

Sl. No. Parameters Test 1. Test 2. Test 3. Requirement(mm)

1 Radius of the

affected area on

use surface side

(mm)

20 21 20

2 Radius of the

affected area on

under surface

side (mm)

Nil Nil Nil

3 Greatest Radius

of the affected

area (mm)

21≤ 75

4 Rime of Ignition

of reach the

clamping ring

(Sec.)

Nil Nil Nil

5 Flame Extension

time (Sec.)

Nil Nil Nil

6 Duration of

afterglow or

smouldering

time(Sec.)

22 21 23

7 Burn Code

I/DNI)

Ignited Ignited Ignited

Remarks: Results of the specimen is satisfactory

Percian Eric Golden (P.E.G)

Sl. No. Parameters Test 1. Test 2. Test 3. Requirement(mm)

1 Radius of the

affected area on

use surface side

(mm)

22 18 21

2 Radius of the

affected area on

under surface

side (mm)

Nil Nil Nil

3 Greatest Radius

of the affected

area (mm)

22≤ 75

4 Rime of Ignition

of reach the

clamping ring

(Sec.)

Nil Nil Nil

5 Flame Extension

time (Sec.)

Nil Nil Nil

6 Duration of

afterglow or

smouldering

time(Sec.)

24 20 26

7 Burn Code

(I/DNI)

Ignited Ignited Ignited

Remarks: Results of the specimen is satisfactory

Percian Vanya Black (P.V.B)

Sl. No. Parameters Test 1. Test 2. Test 3. Requirement(mm)

1 Radius of the

affected area on

use surface side

(mm)

19 21 20

2 Radius of the

affected area on

under surface

side (mm)

Nil Nil Nil

3 Greatest Radius

of the affected

area (mm)

21≤ 75

4 Rime of Ignition

of reach the

clamping ring

(Sec.)

Nil Nil Nil

5 Flame Extension

time (Sec.)

Nil Nil Nil

6 Duration of

afterglow or

smouldering

time(Sec.)

35 36 34

7 Burn Code

(I/DNI)

Ignited Ignited Ignited

Remarks: Results of the specimen is satisfactory

Tibetian Mulberry Red (T.M.R)

Sl. No. Parameters Test 1. Test 2. Test 3. Requirement(mm)

1 Radius of the

affected area on

use surface side

(mm)

20 21 20

2 Radius of the

affected area on

under surface

side (mm)

Nil Nil Nil

3 Greatest Radius

of the affected

area (mm)

21≤ 75

4 Rime of Ignition

of reach the

clamping ring

(Sec.)

Nil Nil Nil

5 Flame Extension

time (Sec.)

Nil Nil Nil

6 Duration of

afterglow or

smouldering

time(Sec.)

33 30 31

7 Burn Code

I/DNI)

Ignited Ignited Ignited

Tibetian Eric Golden (T.E.G)

Sl. No. Parameters Test 1. Test 2. Test 3. Requirement(mm)

1 Radius of the

affected area on

use surface side

(mm)

21 19 20

2 Radius of the

affected area on

under surface

side (mm)

Nil Nil Nil

3 Greatest Radius

of the affected

area (mm)

21≤ 75

4 Rime of Ignition

of reach the

clamping ring

(Sec.)

Nil Nil Nil

5 Flame Extension

time (Sec.)

Nil Nil Nil

6 Duration of

afterglow or

smouldering

time(Sec.)

33 32 35

7 Burn Code

(I/DNI)

Ignited Ignited Ignited

Remarks: Results of the specimen is satisfactory

Tibetian Vanya Black (T.V.B)

Sl. No. Parameters Test 1. Test 2. Test 3. Requirement(mm)

1 Radius of the

affected area on

use surface side

(mm)

18 17 18

2 Radius of the

affected area on

under surface

side (mm)

Nil Nil Nil

3 Greatest Radius

of the affected

area (mm)

18≤ 75

4 Rime of Ignition

of reach the

clamping ring

(Sec.)

Nil Nil Nil

5 Flame Extension

time (Sec.)

Nil Nil Nil

6 Duration of

afterglow or

smouldering

time(Sec.)

42 41 40

7 Burn Code

(I/DNI)

Ignited Ignited Ignited

Remarks: Results of the specimen is satisfactory

Note: - 1. Method A: Mounting of specimen (Loose Laid)

2. Burn Code: I = Ignited, Did Not Ignite

RESULTS AND ANALYSIS

The time (seconds) from application of nut to extinction of flame.

The time (seconds) of any afterglow and smouldering after nut removal and extinction

of flame.

Time for effects of ignition to reach edge of clamping ring (seconds).

Radius of affected area (surface) in mm of each samples.