GB 32086-2015Requirement of vertical flammability characteristic and test method for certain category automobile interior material (English PDF)

2.1 burning rate

The ratio between combustion distance and time used, in millimeters per minute

(mm/min).

4.1 Principle

Vertically fix the specimen on the rectangular frame. Use the predetermined

flame to ignite specimen in the combustion chamber. Determine the combustion

distance and time used of the specimen.

4.2 Test equipment and appliances

4.2.1 Specimen holder

The specimen holder shall be a rectangular frame, as shown in Figure 1.The

frame height is 560 mm.

4.2.2 Pressboard

Use U pressboard to ensure the vertical flatness of specimen on the specimen

holder. The U pressboard shall be flat with rigidity. It is made of suitable material.

The size equals to the specimen holder size. The thickness is 1.0 mm ± 0.1 mm.

Drill 12 round holes of which the diameter is about 4 mm on both sides of the

pressboard.

4.2.3 Gas light

Gas light provides test fire source. Its description and structure shall comply

with the provisions of Annex A.

4.2.4 Gas

The gas used by gas light is industrial propane gas, butane gas or liquefied

petroleum gas.

4.2.5 Marker line

White mercerized cotton thread of which the maximum linear density is 50 tex.

4.2.6 Stopwatch

The stopwatch accuracy to measure time shall not be less than 0.5 s.

4.2.7 Steel ruler

The steel ruler scale is more than 600 mm. The accuracy is 1 mm.

unit. mm

4.2.8 Fuming hood

The specimen holder shall be placed in the fuming hood. The internal volume

of fuming hood is 20 ~ 110 times specimen holder volume. Any one among the

fuming hood's length, width and height must not exceed 2 times any size of the

other two sizes.

4.3 Specimen

4.3.1 Size

The size of specimen. length is 560 mm ± 2 mm; width is 170 mm ± 2 mm; the

thickness is component thickness.

4.3.3 Pre-treatment

Place the specimen under standard state of which the temperature is 23°C±2°C,

the relative humidity is 50%±5% for at least 24 h, till the test starts.

4.4 Test procedure

4.4.1 Carry out the test under the environmental conditions of which the

temperature is 10°C~30°C, the relative humidity is 15% ~ 80%.

4.4.3 Fix the pretreated specimen on the fixing-needle of specimen holder,

close to the location column. Then press the U-pressboard on it to ensure that

the fixing-needle goes through each round hole on the pressboard. The

specimen shall be at least 20 mm away from the frame. Mount the specimen

holder on the top bracket of combustion chamber to ensure the specimen

vertical.

4.4.8 Measure the following times, in seconds (s).

4.5 Calculation

For the specimen burnt to at least the first marker line, the burning speed (vi)

shall be calculated according to the following equation.

4.6 Representation of burning speed result

4.6.1 If the specimen cannot keep burning for 5s after ignition for 15 s in the

flame, or the flame burns out by itself before reaching to the first marker line,

then the burning speed shall be regarded as it fails to comply with requirements.

Both shall be represented as 0 mm/min.

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