GB/T 12002-2026Sealing strips for plastic doors and windows (English PDF)

4.1 Classification

4.1.1 Classification by Use Sealing strips are classified into two categories according to their uses, as shown in Table 1.

4.1.2 Classification by Material Sealing strips are classified into three categories according to their materials, as shown in Table 2.

4.1.3 Classification by Application Scope Sealing strips are classified into two categories according to their application scope, as shown in Table 3.

4.1.4 Classification by shape Glass assembly sealing strips are classified into three categories according to their shape, and frame-sash interlocking sealing strips are classified into two categories according to their shape, as shown in Table 4.

4.1.5 Classification according to flame retardant properties Sealing strips are classified into two categories according to their flame retardant properties, as shown in Table 5.

4.2 Naming The name consists of the document number, purpose, material, application scope, flame retardant properties, and nominal hardness.

6.6 Shore Hardness

6.6.1 Shore Hardness (A) at 23°C Perform the test according to GB/T 2411, take the reading in 15 seconds, and calculate the deviation from the nominal value.

6.6.2 Hardness Change Place the sample in a constant temperature test chamber at the test temperature specified in Table 7, with a temperature deviation of ±2°C. Remove the sample after 2 hours ±

0.25 hours and test it within 10 seconds. The hardness was determined according to the method specified in GB/T 2411, and the hardness difference of each temperature range was calculated according to Table 7.

6.7 Tensile properties Tensile strength and elongation at break were tested according to GB/T 1040.2, using type 5A specimens and a tensile speed of 500mm/min ± 50mm/min.

6.8 Hot air aging performance

6.8.1 Change rate of tensile properties and change in hardness Hot air aging was performed according to GB/T 7141, with a test temperature of 100°C±2°C, for modified polyvinyl chloride and thermoplastic elastomers. The testing time for solid materials is 72h ± 0.5h, and the testing time for rubber materials is 168h ± 1h. Samples are prepared and tested according to the requirements for hardness and tensile properties. The test was conducted, and the change in hardness was calculated, as well as the change rate of tensile fracture strength and the change rate of tensile fracture elongation were calculated according to formula (1).

6.8.2 Weight loss upon heating Five samples of 5g ± 0.5g each were taken, conditioned according to section 6.3, and weighed to an accuracy of 0.0001g. The samples were then placed in a container at 100°C. The rubber products were dried in an electric heating drying oven and the time was recorded. The test time was 168h ± 1h for rubber products and 168h ± 1h for modified polyvinyl chloride and thermoplastic elastomer products. The time between heating and cooling is 72 h ±

0.5 h. The sample is then placed in a desiccator and cooled to the ambient temperature. The mass of the heated sample is weighed to an accuracy of 0.0001 g. Formula (2) is used to calculate the weight loss rate mr during heating.

6.9 Heating shrinkage rate Three 110mm long samples were cut and conditioned according to 6.3. Draw two marks 100 mm apart on each sample and measure their initial distance l0, accurate to

0.1 mm; place the sample on a bed of... Place the talc powder in a tray and put it in an electric heating drying oven at 70°C±2°C for 24 hours. Remove the tray containing the sample from the electric heating drying oven and cool it for 2 hours under the test environment. Measure the distance l1 between each sample mark, accurate to

0.1 mm.

6.10 Compression Permanent Deformation The procedure shall be carried out in accordance with GB/T 7759.1, using type A specimens (diameter

0.5 mm, height

0.5 mm). 0.5mm), modified polyvinyl chloride and thermoplastic elastomers are tested at 70°C±2°C, and rubber is tested at 100°C±2°C. Time 22 0.5 0 h, sample compression (25±2)%.

6.11 Low-temperature brittleness Test according to GB/T 5470.

6.12 Ozone aging resistance The test was conducted according to GB/T 7762, using a 5x magnifying glass to observe the sample. Test conditions. ozone concentration 500 pphm ± 50 pphm, test temperature 40°C±2°C, test time 168h±1h, elongation (20±2)%.

6.13 Compression force Conduct the test as specified in Appendix A.

6.14 Rebound Rate (CR) Conduct the test as specified in Appendix B.

6.15 Oxygen Index Test according to GB/T 2406.2.

7.2 Factory Inspection

7.2.1 Inspection Items The factory inspection items are hardness, compressive force, appearance and dimensional tolerance.

7.2.2 Batching and Sampling Plans Compression force, appearance, and dimensional tolerance inspection shall be conducted according to the same type of sealing strips continuously produced on the same machine in the same shift, as a batch, in accordance with GB/T 2828.1. The standard inspection single sampling plan is adopted, with general inspection level II and an acceptance quality limit (AQL) of

4.Other performance tests are conducted on a per-lot basis. Samples are prepared in batches with a mass not exceeding 5000 kg.

7.2.3 Judgment Rules If the inspection items do not meet the requirements of Chapter 5, double the sampling should be taken from the original batch for re-inspection; if they still do not meet the requirements, they shall be deemed unqualified.

7.3 Type Testing

7.3.1 Inspection Items Type testing covers all items in Chapter 5.

7.3.2 Timing of Inspection Type testing shall be conducted under any of the following circumstances.

a) Trial production and type approval of new products or old products transferred to another factory for production;

b) After formal production begins, if significant changes in the cross-section, materials, or processes may affect product performance;

c) When production resumes after a product has been discontinued;

d) During normal production, this should be carried out once a year;

e) When the factory inspection results differ significantly from the previous type inspection results.

7.3.3 Batching and Sampling Plans A batch is defined as continuous production using the same raw materials, process, formula, and specifications, with each batch not exceeding 5000 kg; if the output is less than 5000 kg... Then, a batch is defined as the output over 7 days. Samples and products are drawn at a rate three times the number of samples and products specified in Chapter 6 of the test methods. test.

7.3.4 Judgment Rules If a product does not meet the requirements of this document, double the sampling should be taken from the original batch for re-inspection; if it still does not meet the requirements, it shall be deemed unqualified.

9.1 Packaging

9.1.1 The sealing strips shall be packaged in rolls (with an inner diameter of not less than 180 mm) or in straight strips.

9.1.2 Cardboard boxes, wooden crates, or crates reinforced with wooden strips should be used as outer packaging. The outer packaging should be securely tied. Other packaging methods are also acceptable. It shall be agreed upon by both the supply and demand parties.

9.2 Transportation Clean transport vehicles should be used to transport the product, and it should be protected from rain. The product is not a dangerous good and can be transported as general cargo.

9.3 Storage Products should be stored in a dry and well-ventilated warehouse, and stored separately in batches. They should not be piled up in the open air to prevent them from being exposed to sunlight and moisture.