Automobile VOC
What are automotive VOCs?

That is, volatile organic compounds emitted by cars.

Harm

When the VOC concentration in the car reaches a certain concentration, people will feel headache, nausea, vomiting, and limb weakness within a short period of time. In severe cases, convulsions, coma, and memory loss may occur. Vehicle VOCs can harm the human liver, kidneys, brain and nervous system, and may even cause cancer.

Characteristics

1. The space inside the car is small and the pollution level is high.

2. Cars are very airtight. In most cases, the doors and windows are closed, which is not conducive to the diffusion of harmful gases.

3. Cars are mobile vehicles with a large amount of convective heat exchange with the outside world. The external climate conditions change greatly, making it more difficult to control conditions such as temperature.

4. Car glass doors and windows occupy a large area, and when exposed to sunlight for a long time, the temperature inside the car changes greatly. At high temperatures, harmful substances in car interior parts and decorative materials are more likely to volatilize.

5. The high population density in the car increases the pollution.

Main test methods

For automobile VOC content testing, it mainly covers vehicle VOC, assembly (in-car parts) VOC and material VOC. The corresponding test methods will be discussed below.

Vehicle VOC content test method

Different car models have different test standards, including the German PV3938 standard, Japan's "VOC Test Method in Cars", Russian GOST R51206-2004 standard and the domestic "Sampling Test Method for Volatile Organic Compounds and Aldehydes and Ketones in Cars", that is, HJ/T 400-2007 test standard, the specific test conditions are as follows:

PV3938 test standard: test conditions: 23℃, 50% RH; test method: static test; sampling method: use infrared lights to illuminate different parts of the car at the same time to make the surface temperature reach 65℃, and collect air samples in the car after being closed for a certain period of time.

"VOC test method in the car": Test conditions: 23°C, 50% RH; Test method: semi-dynamic test; adjust the temperature to 40°C, maintain it for 4.5 hours, and then use a DNPH sampling tube to collect the air in the car for 30 minutes and then measure formaldehyde; after the sampling is completed Start the car engine, make its air conditioner work normally, and measure VOC.

GOST R51206-2004 standard: test conditions: 23, 50% RH; test method: dynamic test; Mode 1: drive at a constant speed of 50 km/h, and test after 20 minutes of stable driving speed; Mode 2: test as specified by the manufacturer Test after idling at a small stable speed for 20 minutes.

HJ/T 400-2007 test standard: issued by the State Environmental Protection Administration on December 7, 2007, and implemented on March 1, 2008. The standard stipulates the setting of sampling points for measuring volatile organic compounds and aldehydes and ketones in the passenger compartment of motor vehicles, technical requirements for sampling environmental conditions, sampling methods and equipment, corresponding measurement methods and equipment, data processing, quality assurance, etc.

Ambient temperature: 25.0±1.0℃ Relative humidity: 50±10%. Test method: 1. The inspected vehicle is placed in a vehicle test environment that meets the regulations; 2. The new vehicle should be qualified for 28 days ± 5 days and the internal surface is required to be free of coverings; 3. The windows and doors are opened and the stationary time is not less than 6h; 4. During the preparation period, the vehicle test conditions should meet the regulations, and the sampling device should be installed; 5. Close all doors and windows, and keep the vehicle under inspection closed for 16 hours before starting collection.