Test method for the content of volatile substances in leather used for car seats

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This post was last edited by xh8618 on 2017-10-18 at 13:08. The content of volatile substances in car interior accessories is an important factor affecting the interior environment of the car as well as the driver’s visibility. During the production and functional improvement of automotive interior accessories, small molecular substances are likely to be introduced into them. These substances are volatile, especially when the temperature inside the vehicle is high, at which point their volatility increases further. Small molecular substances emitted from interior accessories in cars either float in the air, contaminating the indoor air quality of the vehicle; when inhaled, they can harm human health. Alternatively, they may condense on the car windows, affecting visibility and posing a threat to driving safety. Therefore, how to test the volatile substance content in automotive interior components is a matter of widespread concern in the automotive industry. The content of volatile substances in automotive interior components is characterized by their misting properties, which are verified through misting tests. There are mainly three testing methods: the gloss method, the haze method, and the weighing method. The first two focus on assessing the impact of volatile substances on driving visibility, while the latter is used to determine the amount of volatile substances present in the sample. Currently, among the three methods, the weighing method and the gloss method are more widely used. Standards that can be referred to for fogging tests include QB/T 2728-2005 \"Leather – Physical and mechanical testing – Determination of fogging property\", DIN 75201-1992 \"Automotive interior materials – Determination of fogging property\", BS EN 14288-2003 \"Leather – Physical and mechanical testing – Determination of fogging characteristics\", etc. The testing principle involves raising the temperature to accelerate the evaporation of small-molecule substances in automotive interior components, thereby shortening the evaporation time. During the test, the sample is placed in a fogging cup; an aluminum foil or glass plate is placed above the fogging cup. The fogging cup is then placed in the heating chamber of the atomization tester for heating, while the aluminum foil or glass plate above it is cooled using a cooling device. The gases evaporated from the sample will condense on the surface of the cooled aluminum foil or glass plate. By testing the optical properties of the glass plate or the weight change of the aluminum foil before and after condensation, the properties of the sample can be determined. Scope of application: (1) It is suitable for evaluating the evaporation of volatile components in interior materials for vehicles, aircraft, etc., such as plastic parts used in vehicle interiors, polyurethanes, textiles, leather, adhesives, non-woven fabrics, etc., under high temperatures. It can also be used to measure the high-temperature atomization phenomenon of xenon headlights in vehicles. (2) Suitable for testing high-temperature volatile components in plastic raw material pellets. (3) It can be extended to the volatile matter testing of products such as carpets, leather, sponge, and rubber under high-temperature conditions. (4) It can meet various international standards, such as ISO 6452, DIN 75201, SAE J1756, QB/T 2728, BS EN14288, PV 3920, NES M0161, TSM 0503G, etc. Test procedure (1): Turn on the atomization tester and set the temperature parameters to keep the temperature of the high-temperature tank at 100°C. (2) Three specimens with a diameter of 80 mm were cut from the sample surface and placed in a desiccator to be dried for at least 2 days under environmental conditions of 23±2°C. (3) Thoroughly clean the misting cup and dry it completely. (4) Accurately weigh the aluminum foil and record the weight. (5) Place the samples in 3 misting cups respectively; take another misting cup and add 10±0.1 g of the standard substance dioctyl phthalate (DOP) for a control test. Place a sealing ring, a weighed aluminum foil sheet, a glass sheet, and filter paper on top of each misting cup in sequence. (6) Place the fogging cup in the high-temperature tank of the fogging tester, which has been heated to 100°C, and place the cooling plate on filter paper; the temperature of the cooling water is 21°C. Heat for 16 h. (7) Remove the aluminum foil sheet, place it with the atomized side facing up in a dryer to dry for 3.5 ~ 4 hours, and then weigh it accurately. The difference in weight of the aluminum foil before and after the test is the atomization value of the sample. The content of volatile substances in automotive interior components can be measured through a nebulization test. The atomization tester is a specialized testing device used to evaluate the atomization properties of products such as leather, non-woven fabrics, textiles, rubber, and adhesives. It offers stable and reliable testing conditions, high precision, and good reproducibility of test results, enabling an accurate reflection of the atomization properties of the samples being tested.