GB/T 14531-2017Office furniture - Tables, chairs and stools for reading (English PDF)

5.2 Determination of appearance properties

5.2.1 Discoloration of wooden part coating In the exterior and internal finishing parts of the product, make inspections at three places, respectively, use hands to hold the degreased white gauze which has been moistened with water to rub each places back and forth with appropriate force, the reciprocating distance of the rubbing is 200 mm ~ 300 mm. Observe whether the gauze is stained by the coated parts.

5.2.2 Other appearance items Under natural light or near natural light (such as 40 W fluorescent lamp) with an illuminance of 300 lx ~ 600 lx, the line of sight is 700 mm ~ 1000 mm, which is jointly tested by three people. Most of the same conclusions are used as test results.

5.3 Determination of main dimensions and dimensional deviations Use a steel tape measure or steel ruler with a division value of not more than 1 mm to measure the product dimension required. The difference between the measured value of the product width, depth and height and the identified value is the dimensional deviation.

5.4 Shape and position tolerance measurement

5.4.1 Adjacent side perpendicularity Use the steel tape measure or a steel ruler having a division value of not less than 1 mm to measure the length of the two diagonal lines of the rectangular surface (component) of the product, the difference is the measured value of the perpendicularity of the adjacent side.

5.4.2 Warpage select one test region for each pollutant to perform test.

5.5.1.5 Soft and hard covering surface light fastness The length and width of the test piece shall be determined in accordance with the shape and dimension of the test piece clamp of the equipment. The test shall be carried out in accordance with the provisions of

4.30 of GB/T 17657- 2013. The number of test pieces shall be 1, which should be obtained from the product.

5.5.1.6 Paint film adhesion It is determined in accordance with the provisions of GB/T 4893.4-2013, select one test region for testing.

5.5.1.7 Paint film resistance to cold and heat temperature difference It is determined in accordance with the provisions of GB/T 4893.7-2013, select one test region for testing.

5.5.1.8 Paint film abrasion resistance It is determined in accordance with the provisions of GB/T 4893.8-2013, select three test regions for testing.

5.5.1.9 Paint film dry heat resistance It is determined in accordance with the provisions of GB/T 4893.3-2005, select one test region for testing.

5.5.1.10 Paint film damp heat resistance It is determined in accordance with the provisions of GB/T 4893.2-2005, select one test region for testing.

5.5.1.11 Paint film liquid resistance It is determined in accordance with the provisions of GB/T 4893.1-2005, select one test region from the acid resistance and alkali resistance, respectively, for testing.

5.5.1.12 Paint film impact resistance It is determined in accordance with the provisions of GB/T 4893.9-2013, select one test region for testing.

5.5.2 Determination of physical and chemical properties of metal parts plating 6670-2008.

5.5.4.2 Seating surface foam plastic 75% compression set It is determined in accordance with the method as specified in GB/T 6669-2008, the test temperature is (70 ± 1) °C, the thickness of the specimen is 25 mm (thin material with thickness less than 25 mm is allowed to be combined, as shown in

6.1 of GB/T 6669-2008).

5.6 Determination of mechanical properties

5.6.1 Strength and durability The strength and durability of the table are measured in accordance with the grade 3 requirements as specified in GB/T 10357.1-2013. The strength and durability of the chair/stool are measured in accordance with the grade 3 requirements as specified in GB/T 10357.3-2013.

5.6.2 Stability The stability of the table is determined in accordance with the provisions of GB/T 10357.7-2013, the stability of the chair/stool is determined in accordance with the provisions of GB/T 10357.2-2013.

5.7.1 Reading table with fixed lamps and sockets

5.7.1.1 The lamp parts shall be determined in accordance with the provisions of GB 7000.201.

5.7.1.2 The socket parts shall be determined in accordance with the provisions of GB/T 2099.1.

5.7.1.3 Other items (see 4.7.1.1 ~ 4.7.1.3) are determined by visual inspection and hand feeling.

5.7.2 Limits of harmful substances in products The volatile organic compounds and migratory elements of the products are In one inspection cycle, randomly take 2 samples from the recently produced products, 1 sample is sent for inspection and the other is retained.

6.4.3 Type inspection items Type inspection items include all items specified in clause 4 of this standard.

6.4.4 Type inspection procedure The inspection procedure shall follow the principle of minimizing the impact onto the correctness of the remaining inspection items.

6.4.5 Determination of type inspection If the basic items are all qualified, the number of the disqualified general items does not exceed 4, the product is judged to be a qualified product. The products failing to reach the requirements for qualified products are disqualified products.

6.4.6 Re-inspection of type inspection If the product is disqualified by type inspection, the retained spare sample may be re-inspected. For disqualified items and items that have not been inspected due to damage to the test piece, the test shall be carried out in accordance with the provisions of 6.3.5, and the "reinspection" shall be indicated in the test result.

7 Product markings, instructions for use, packaging,

transportation, storage

7.1 Product markings The product markings shall include at least the following.

a) Product name, specification and model;

b) Product implemented standard number;

c) The name of material used for the product and its use location;