GB/T 19250-2013Polyurethane waterproofing coating (English PDF)

3.1 Classification

3.1.1 The products can be divided into 2 classifications according to the components, namely, single-component (S) and multi-component (M).

3.1.2 The products can be divided into type I, type II, and type III according to their basic performances (see Annex A).

3.1.3 The products can be divided into exposed (E) and non-exposed (N) according to whether they are used in exposure.

3.2 Marking

Marking shall be made in sequence of the product name, composition, basic performance, whether it is exposed, harmful substance limits, and standard number. Examples.

5.1 Appearance

Products are uniformly viscous, without gel or agglomerate.

5.2 Physical and mechanical performances

5.2.2 Optional performances

The optional performances of polyurethane waterproof coating shall comply with the provisions of the Table 2. And they shall be chosen by the supplier and purchaser according to the product application engineering or environmental conditions.

6.1 Standard test condition

Standard test condition is. Temperature of 23°C±2°C, and the relative humidity of (50±10) %.

6.2 Test equipment

6.2.7 Impervious instrument. Pressure is 0 MPa - 0.4 MPa, the precision is 2.5 class, with 3 seven-hole permeable plates, and the inner diameter is 92 mm.

6.2.8 Thickness gauge. The interface diameter is 6 mm, pressure is 0.02 MPa per unit area, and the dividing value is 0.01 mm.

6.2.9 Semiconductor thermometer. Range is - 40°C - 30°C, Precision is 0.1°C.

6.2.10 Elongation maintaining instrument. It can make the distance between the specimen's markings to stretch more than 100%.

6.2.11 Xenon arc lamp aging test box. Xenon arc lamp aging test case which meets the requirements of GB/T 18244-2000.

6.3 Test specimen preparation

6.3.1 Before specimen preparation, samples and test instruments shall be placed under standard test condition for at least 24 h.

6.3.2 WEIGH the required sample amount. It shall ensure that the final coating thickness is 1.5 mm ± 0.2 mm.

6.9 Tensile performance

PRTFORM the test according to Chapter 9 of GB/T 16777-2008. The tensile rate shall be 500 mm/min ± 50 mm/min.

6.10 Tear strength

TEST according to the rectangular shape specimen in GB/T 529-2008. It shall be no cut-mouth and the stretching rate is 500 mm/min ± 50 mm/min. TEST 5 specimens. TAKE the average of the 5 specimens as the test result.

6.11 Low temperature bending

TEST according to Chapter 14 of GB/T 16777-2008.

6.12 Imperviousness

TEST according to chapter 15 of GB/T 16777-2008, with the metal mesh aperture of 0.5 mm ± 0.1 mm.

7.1 Inspection classification

The inspection is classified into ex-factory inspection and type inspection.

7.1.1 Ex-factory inspection

Ex-factory inspection items include. Appearance, solid content, surface drying time, hard drying time, tensile strength, breaking elongation, tearing strength, leveling performance and bending at low temperature, and waterproofness.

7.2 Batch grouping

As for the same type, TAKE 15t as a batch. Those less than 15t can be taken as a batch (multi-component products shall be grouped in batch according to the components).

7.3 Sampling

In each batch of products, randomly SELECT 2 groups of samples, with 1 group for inspection and the other for standby and storage. Each group is at least 5 kg (multi-component products shall be extracted according to the ratio). The product shall be stirred well before sampling. If spraying and coating method is adopted, the sample quantity of extraction shall be according to the needs.

7.4 Judgment rules

7.4.1 Single judgment

7.4.1.3 Harmful substance limits

JUDGE it according to the product marking, and class A or class B of Table 3. If it conforms to the corresponding categories, it shall be qualified.

7.4.2 General judgment

If the appearance, basic performances, optional performances selected according to Table 2, and harmful substance limits meet the requirements of the standard, this batch of products shall be judged as qualified.

8.1 Marking

The external packing of the products shall include.

8.2 Packaging

Products are sealed in iron drums with covers. Multi-component products are packed separately according to the composition. Packaging of different components shall be differentiated obviously.

8.3 Storage and transportation

In storage and transportation, products of different classifications shall be stacked respectively. AVOID sunlight, rain, combustion source and collision. KEEP well ventilated. Storage temperature is between 5°C and 40°C. […]