[How to detect harmful substances in carpet pads and carpet adhesives?]
Release date:[2020/1/4] Is reading[584]次

How to detect harmful substances in carpet pads and carpet adhesives?


   (I) Small Environmental Test Chamber Method


    1. Small environmental test chamber

  The small environmental test chamber is composed of a sealed chamber, an air filter, an air temperature and humidity adjustment control and monitoring system, an air flow, a flow adjustment control device, and an air sampling system, as shown in Figure 3-6. It is a simulation of the indoor environment. Under certain test conditions (temperature, humidity, air velocity, air exchange rate, etc.), the sample is exposed to the cabin, and after a certain period of time, the harmful gases in the cabin are collected.


    2. Test conditions in small environmental test chamber

    The test conditions of the small environmental test chamber method mainly include aspects such as air temperature, air relative humidity, air exchange rate, and air velocity. The specific test conditions should meet the following requirements: air temperature (23 ± 1), air relative humidity (504-5)%, air exchange rate 1.0h ~, and air velocity 0.1 ~ 0.3m / s.


    3. Test sampling, packaging and sample preparation

    (1) Sampling

    The samples used in the test shall be taken from the products produced in the conventional manner and taken off the machine for no more than 30 days after inspection and qualified packaging.

    When taking samples from a rolled product, at least 2m from the end, take at least two pieces of sample from the middle.

    A block of carpet shall be randomly selected from a batch of products; a carpet adhesive shall be randomly selected from a batch of products.


    (2) Packing

    The sample is rolled into a roll along the direction of roll carpet production, the sample is fastened with a rope and wrapped in an air-tight, inert packaging bag.

    The time from the selection of the sample to the packing bag should not exceed lh, and it should be sent to the laboratory immediately.

    The outer packaging of the sample shall be marked with the product type, production date, production batch number and the name of the manufacturer.


    (3) Sample

    To ensure the accuracy of the carpet sample test, the test sample should be inspected as soon as possible after it reaches the laboratory.

    Carpet and carpet pad samples should be at least 100 mm away from the edge of the sample, and a sample should be taken according to the required area, and its material / cabin load ratio is 0.4 / m.

    The carpet tile should be sampled in the middle of the box, which can be representative.

    Carpet adhesive samples. Apply the adhesive on the simulation plate (glass plate or stainless steel plate), the material / cabin load ratio is 0.01 / m, and the coating density (mg / c) is performed according to the manufacturer's instructions.


    4. Small environmental test chamber method test procedure

    (1) Preparation of test chamber The preparation of test chamber mainly includes the following aspects.


    Test the cleaning of the front cabin. First clean the inner wall of the test chamber with an alkaline cleaning agent, scrub twice with deionized or distilled water, and then dry clean.

    Pass the clean air after purification treatment into the environmental test chamber under the test conditions.

    Before the test begins, the test conditions in the cabin, such as temperature and humidity, air velocity, air tightness, and background content of the cabin air, should be below the detection limit of the analytical method.

    The test specimen shall be laid on the bottom of the bilge with the carpet facing upwards, so that the air flow passes uniformly through the surface of the specimen.


    (2) End of test time During the test, the duration of discharge of the sample under the test conditions in the cabin is 24h.


    (II) Calculation of test results of harmful substances in carpet pads and carpet adhesives


    According to the current national standard "Releasing Limits of Hazardous Substances for Carpets, Carpet Liners and Carpet Adhesives for Interior Decoration Materials" (GB l8587-2001), the harmful substances of carpets, carpet pads and carpet adhesives can be Calculated according to formula (3-4):

    EF--Cs (N / L) (3-40)

    In the formula, EF is the cabin release amount, mg / (· h); Cs is the cabin concentration, mg / m; N is the cabin air exchange rate, h-1; L is the material / cabin load ratio, / m.


The above is the detailed detection method of harmful substances in carpet pads and carpet adhesives. I hope to help everyone.


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