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                                                      车辆内饰材料燃烧试验箱

内饰材料燃烧试验箱满足标准ISO3795，DIN75200和MVSS302，用于测定公路车辆、拖拉机以及农、林用机械车辆等的内饰材料（例如纺织品、塑料及其他合成材料）的水平燃烧速率（燃烧距离和燃烧时间）

内饰材料燃烧试验箱标准:

Test Device in accordance with DIN 75200, ISO 3795, MVSS 302

This standard specifies a method for determining the horizontal burning rate of materials used in the occupant compartment of road vehicles （for example, passenger cars, lorries/trucks, estate cars, coaches）, and of tractors and machinery for agriculture and forestry, after exposure to a small flame.

This method permits testing of materials and parts of the vehicle interior equipment individually or in combination up to a thickness of 13 mm. It is used to judge the uniformity of production lots of such materials with respect to their burning behavior.

Because of many differences between the real world situation （application and orientation within vehicle interior, conditions of use, ignition source, etc.） and the precise test conditions specified in this

standard, this method cannot be considered as suitable for evaluation of all true in-vehicle burning characteristics.

 1.Principle

 A sample is held horizontally in a U-shaped holder and is exposed to the action of a defined low-energy flame for 15 s in a combustion chamber, the flame acting on the free end of the sample. The test determines if and when the flame extinguishes or the time in which the flame passes a measured distance.

2. Apparatus

2.1 Combustion chamber Made of polished stainless steel. The front of the chamber contains a flame-resistant observation window, which covers the front, constructed as an access panel.

The buttom of the chamber has vent holes, and the top has a vent slot all around. The combustion chamber is placed on four feet, 100 mm high.

The chamber has a hole at one end for the introduction of the sample holder containing the sample; in the opposite end, a hole is provided for the gas line. Melted material is caught in a pan which is placed on the buttom of the chamber between vent holes without covering any vent hole area.

2.2 Sample holder, consisting of two U-shaped metal plates or frames of corrosion-proof material.

The lower plate is equipped with pins, the upper one with corresponding holes in order to ensure consistent holding of the sample. The pins also serve as measuring points at the beginning and the end of the burning distance.

A support is provided in the form of 0.25 mm diameter heat-resistant wires spanning the frame at 25 mm intervals over the buttom U-shaped frame.

The plane of the lower side of samples is 178 mm above the floor plate. The distance of the front edge of the sample holder from the end of the chamber is 22 mm; the distance of the longitudinal sides of the sample holder from the sides of the chamber is 50 mm.

2.3 Gas burner. The small ignition source is provided by a Bunsen burner having an inside diameter of 9.5 mm. It is located in the test cabinet so that the centre of its nozzle is 19 mm below the centre of the buttom edge of the open end of the sample.

2.4. Test gas. The gas supplied to the burner shall have a caloric value of approximay 38 MJ/m3 （for example natural gas）.

2.5 Fume cupboard. The combustion chamber may be placed in a fume cupboard assemble provided that the internal volume is at least 20 times, but not more than 110 times greater than the volume of the combustion chamber and provided that no single height, width, or length dimension of the fume cupboard is greater than 2.5 times either of the other two dimensions.

Before the test, the vertical velocity of the air through the fume cupboard shall be measured 100 mm in front of and behind the final position where the combustion chamber will be located. It shall be between 0.1 m/s and 0.3 m/s in order to avoid possible discomfort, by combustion products, to the operator. It is possible to use a fume cupboard with natural ventilation and an approbate air velocity.

3. Samples

3.1 Shape and dimensions

The thickness of the sample corresponds to the thickness of the product to be tested. It shall not be more than 13mm. When taking the sample permits, the sample shall have a constant section over its entire length.

When the shape and dimensions of a product do not permit taking a sample of the given size, the following minimum dimensions shall be maintained:

For samples having a width of 3 mm to 60 mm, the length shall be 356 mm. In this case, the material is tested in the product width.

For samples having a width of 60 mm to 100 mm, the length shall be at least 138 mm. In this case the potential burning distance corresponds to the length of the sample, the measurement starting at the first measuring point.

Samples having a width of less than 60 mm and shorter than 356 mm, and samples having a width of 60 mm to 100 mm and shorter than 138 mm, cannot be tested according to this method; neither can samples having a width less than 3 mm.