GB/T 10801.1-2021Moulded polystyrene foam for thermal insulation(EPS) (English PDF)

5.3 of this Edition; 4.3 of the 2002 Edition);

g) Delete the compressive strength >= 400kPa in the requirements; and add the compressive

strength >= 500kPa and >= 800kPa in the requirements; (see 5.3 of this Edition; 4.3 of the

6.2 Numerical rounding off

When judging whether the measured value or its calculated value meets the requirements of the

standard, the measured value or its calculated value obtained from the test shall be compared

with the limit value specified in the standard; and the comparison method shall be conducted

according to rounding off comparison method specified in GB/T 8170-2008

6.3 Appearance

Visual inspection under natural light.

6.4 Dimensions and tolerances

Dimensions are measured in accordance with GB/T 6342-1996. The number of samples is 3

boards; measure the length, width, and thickness of each sample at 6 points, take the arithmetic

mean value; and calculate the deviation from the nominal length, nominal width, and nominal

thickness. Measure the difference between the two sets of diagonals on the two large surfaces

of the board, and take the arithmetic mean.

6.5 Compressive strength

Conduct according to the provisions of GB/T 8813-2020; the compressive stress at the relative

deformation of 10%. The specimen dimension is (100+/-1)mmx(100+/-1)mmx(50+/-1)mm; the

number of specimens is 5; the test speed is 5mm/min; and take the arithmetic mean of the test

results of 5 specimens.

6.6 Dimensional stability

Conduct according to the provisions of GB/T 8811-2008 at the temperature of (70+/-2) degrees C, and

the time for (48+/-2)h. The specimen dimension is (100+/-1)mmx(100+/-1)mmx(25+/-1)mm; the

number of specimens is 3; and take the average of the absolute values of the test results of the

6.7 Water vapor transmission coefficient

Conduct according to the provisions of QB/T 2411-1998. The thickness of the specimen is

(25+/-1)mm. When the thickness is less than 25mm, the original thickness is used for the test.

The test temperature shall be (23+/-1) degrees C, and the relative humidity gradient be 0%~(50+/-2)%; the

number of specimens is 5; and take the arithmetic mean of the test results of the 5 specimens.

6.8 Water absorbing capacity

Conduct according to the provisions of GB/T 8810-2005. The water temperature is (23+/-2)°C,

and the soaking time is (96+/-4)h. The specimen dimension is

(150+/-1)mmx(150+/-1)mmx(50+/-1)mm; the number of specimens is 3; and take the arithmetic

mean of the test results of the 3 specimens.

In one of the following situations, type inspection shall be carried out:

a) When a new product is finalized and identified;

b) After normal production, when there are major changes in raw materials, processes, and

main production equipment;

c) During normal production, inspect at least once a year;

d) When the product has been discontinued for more than six months and production is

resumed.

7.2 Batching

The quantity of products of the same specification shall not exceed 2000m3 as a batch.

7.3 Judgment rules

7.3.1 Judgement of exit-factory inspection

Ten groups are randomly selected for inspection of size deviation and appearance; three pieces

form a group; and if two or more of them are unqualified, the batch is considered unqualified.

The physical and mechanical properties are randomly sampled from this batch of products. If

any item is unqualified, double sampling shall be taken from the original batch; and the

unqualified items shall be re-inspected. If the re-inspection result is still unqualified, the entire

batch is judged to be unqualified.

7.3.2 Judgment of type inspection

Randomly select the number of samples that meet the experimental requirements from qualified

products; and conduct the test according to the method specified in Clause 6; and the results

shall meet the requirements in Clause 5.

8.1 Marking

When the product leaves the factory, it shall be accompanied by a product certificate; and

marked with the following information, such as product name, used standard number,

trademark, company name, detailed address, product marking, nominal apparent density,

nominal length, nominal width, nominal thickness, production date, batch number.

8.2 Packaging

Products can be packaged with plastic straps, plastic bags, shrink film, etc., and can also be

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