1 Overview This article refers to the address: http:// As the performance and processing of non-metallic materials change rapidly, non-metallic materials are being applied to automobiles at an unprecedented rate. The average amount of non-metallic materials per car has increased from 68.4 kg in 1981 to the current 150-180 kg. With the increasing application range of non-metallic materials in the automotive field, it also demands the detection of the corresponding properties of such materials, such as the impact of the volatilization of toxic and harmful substances on the human body, and the volatile materials in the interior materials on the windshield. The effect of condensation on the driver's driving safety, the permeability of the plastic fuel tank, the barrier of the inner tube, the airbag, the breathability and moisture permeability of the seat cushion, the backrest, etc., and the comfort of the rider, etc. These problems, the corresponding testing methods, testing standards, testing instruments have also been introduced and constantly improved, below, the author will briefly introduce the relevant testing items. 2. Detection of the influence of volatile materials on the windshield of automotive interior materials Automotive interior materials, such as engineering plastics, textiles, leather, non-woven fabrics, etc., as well as various adhesives used to install these materials, under the action of high temperature, their volatile components will evaporate and be in the window of a car or Condensation formed on the windshield, causing poor driver's line of sight and seriously affecting driving safety. At present, foreign countries have already tested this aspect, and the relevant test standards are DIN 75201, ISO 6452, SAE J1756, etc., and some domestic auto and interior parts manufacturers are also required to improve product quality or to open up overseas markets. The relevant tests have attracted enough attention. There are two test methods for the atomization detection of interior parts: gloss test and weight test. The former measures the atomization characteristics of the test sample by the change of the gloss before and after atomization of the glass plate; the latter is the quality of the atomized condensate obtained by the change of the mass of the aluminum foil before and after atomization. In addition, the "fog value" or "atomization-condensate quality" obtained through the test can also quantitatively obtain the volatile amount of the toxic and harmful substance of the sample; by testing the atomization value of the front xenon lamp, Test the extent to which the fogging of the headlights can affect the illumination. At present, the atomization test equipments sold in the Chinese market include brands such as Hucker in Germany and Languang in Jinan, China. 3. Detection of air permeability of automobile plastic fuel tank Compared with the steel fuel tank, the automotive plastic fuel tank has the characteristics of safer, corrosion-resistant, long service life, and has a random shape and low production cost. At present, the plastic fuel tank usage rate of Chinese cars has reached 86%. Although plastic fuel tanks have many advantages, the biggest disadvantage of steel fuel tanks is that the barrier properties of the materials are poor, which will cause the fuel to penetrate and volatilize. It is necessary to test the barrier properties to select the ideal material. The traditional test method is: after injecting the quantitative gasoline into the fuel tank, sealing, weighing the fuel tank to obtain the mass M1, after being placed for a sufficient time (generally more than 100 days), weigh again to obtain the mass M2, and calculate ΔM= M1-M2, △M is the amount of fuel volatilization. This method requires a long test time and requires a high-precision weighing tool, which is difficult to implement. Another test method is given in ASTM D3985. Cut the plastic sheet of the fuel tank, measure the oxygen permeation of the sheet, and compare the oxygen permeability of various plastic sheets to scientifically and quickly determine which plastic has better barrier properties and is more suitable for manufacturing fuel. box. In ASTM F1307, the test method for the entire container is given, thus enabling the entire tank seal test. 4, the detection of air permeability and moisture permeability of car seat materials Drivers and passengers travel long distances in the car, often sitting in the car for several or even dozens of hours, so the ventilation and moisture permeability of the car seat material is higher and stricter than other places. A good seat cushion and a chair should be soft and elastic, and have good ventilation and moisture permeability, so that the sweat of the driver and passenger can be smoothly discharged, which makes people feel comfortable. The method for detecting the air permeability is as follows: a sample of a predetermined size is placed in a test chamber, and an empty side of the sample is evacuated to form a certain pressure difference between the two sides of the sample, and the gas is measured under a pressure difference for a certain period of time. Calculate the air permeability according to the flow rate in a given area; or maintain the flow rate through the sample, measure the pressure difference between the two sides of the sample, and calculate the air flow resistance. This test method follows GB/T10655-2003. The method for detecting moisture permeability is as follows: the sample is thermostatically sandwiched between the dry and wet chambers, the humidity in the sensor chamber of the test chamber is changed, and the time required from the preset lower limit value to the upper limit value is tracked through continuous Multiple measurements and system analysis were performed to determine the moisture permeability and moisture permeability coefficient of the sample. This test method follows ASTM E398. 5, gas barrier testing of car inner tube and airbag The materials for manufacturing inner tubes and airbags are required to have good barrier properties. The former guarantees that the car will run for a long time without inflating. The latter guarantees that it can be quickly bulged at the moment of accident collision to ensure a certain pressure. The traditional detection method is to inflate the finished inner tube or airbag to a certain pressure, record the pressure gauge value at this time, and after standing for a period of time, observe the pressure drop of the pressure gauge value, thereby obtaining the barrier performance. This type of test generally takes a long time to produce results (sometimes more than a year) and is difficult to implement. Now you can use the VAC-V1 gas permeation instrument produced by Jinan Languang Electromechanical Technology Co., Ltd. to sample the material to be tested and clamp it on the instrument to maintain a constant pressure difference on both sides of the sample. The pressure changes with time after the sample, resulting in the barrier properties of the material. The test on this instrument can be completed within 24 hours, which greatly improves the work efficiency. 6, other automotive non-metallic materials testing There are many non-metallic materials used in automobiles, and the same material has different performance requirements for different parts, and various items need to be tested. For example, tensile strength, tear strength, hardness, flexural strength, color, coefficient of friction, and the like. In addition, in the use of automobiles, a large variety of adhesives are used in large quantities. The performance of the adhesives has a crucial influence on the quality of the whole vehicle, so it is necessary to cut and pull such non-metallic materials. Performance tests such as stretching and pulling off. 7, the conclusion The non-metallic materials are lightweight, which makes the car lighter to achieve energy-saving effects, especially the good processing technology of such materials gives car manufacturers higher part design and modeling freedom. 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