5.4.7 Sample Determination: According to the standard curve plotted steps to determine the absorbance of the sample soaking solution, incorporated into the standard curve and GF samples of soluble lead, soluble cadmium.

5.4.8 Calculation:

Where:

- Sample heavy metals, in mg per square meter (mg / m);

- Look up from the standard curve samples soaking solution heavy metals, in mg per milliliter (mg / mL);

- Blank liquid heavy metal content in mg per milliliter (mg / mL);

- Sample the actual injection volume of soaking solution, in units of milliliters (mL);

- The total volume of the sample soaking solution, unit ml (mL).

5.4.9 The results indicated that: the arithmetic mean of two samples that retained two significant figures.

5.5 Determination of volatile

5.5.1 Instruments and equipment: electric drying oven, analytical balance (being the amount 0.0001g).

5.5.2 to floor sheets in a flat state, along the width direction of uniform products to take the shape of cut 100mm × 100mm sample 3, sample according to GB / T 2918-1998 in 23/50

Two environmental conditions of 24h conditioning.

5.5.3 Weigh the sample accurate to 0.0001g.

5.5.4 Regulation electric drying oven to 100 `C ± 2` C, the level of the sample placed on a metal mesh or porous plate, the sample interval of at least 25mm, the blast in order to maintain air circulation.

Sample can not be a direct radiation heating elements.

5.5.5 6h ± 10min after the removed sample, the sample in the GB / T 2918-1998 in the environmental conditions placed 23/50 2 after 24h weighing (accuracy to 0.0001g).

5.5.6 by the following formula volatile content:

Where:

- Volatile matter content, in units of grams per square meter (g / ㎡);

- The quality of the sample before testing, unit gram (g);

- The quality of the sample test, unit gram (g);

S - sample size, units per square meter (square meters).

5.5.7 The results indicated that: the arithmetic mean of three samples that retained two significant figures.

6 Inspection rules

6.1 the same formula, process, specification, design and color models of membrane floor, 5000 square meters as a group, less than this amount for a group.

6.2 The standard of all the technical requirements listed in the contents of both types of test items.

6.2.1 In normal production, the annual type inspection at least once.

6.2.1 one of the following conditions should be carried out type tests:

- When setting the new product trial:

- Production process and raw materials have more changes;

- Products have been discontinued, the resumption of production.

6.3 The test results for all items reached the standard specified requirements, determine the product qualified for the test; if a test result does not meet the specified requirements of this standard, the judge failed to test the product.

Keywords：  

Product：