GB/T 40052-2021Perservative-treated plywood (English PDF)

3.1 Preservative-treated plywood

It is produced with veneer treated with compression method and other methods as raw materials, which can prevent decay, insect pests (including termites) or marine borehole animal hazards. Harmful plywood.

3.2 Drug loading retention

The minimum amount of preservative required to be retained in the analysis area of the preservative plywood inspection sample. Usually refers to the active ingredients of preservatives, in thousands Gram per cubic meter (kg/m3) said. [Source: GB/T 14019-2009, 3.4.71, with modification]

3.3 Penetration

The degree to which the preservative (active ingredient) penetrates into the sapwood of the preservative plywood veneer.

Note: Penetration is expressed in percentage (%).

5.1 Specifications and deviations

Should meet the requirements of 5.1 in GB/T 9846-2015.

5.2 Appearance quality

The surface of the anticorrosive plywood should be clean, free of foreign matter adhering, no visible preservative deposits, no shortage of surface boards, no bubbling, and no delamination.

5.3 Moisture content

The moisture content should be 5%~14%.

5.4 Bonding strength

The gluing strength should comply with the regulations in 5.3.2 of GB/T 9846-2015 for Type I and Type II plywood.

5.5 Dipping and peeling

It shall meet the requirements of 5.3.3 in GB/T 9846-2015.

5.6 Bending strength and elastic modulus

It shall meet the requirements of 5.3.4 in GB/T 9846-2015.

5.7 Formaldehyde emission

When used indoors, the amount of formaldehyde released should meet the relevant regulations of GB 18580-2017.

5.8 Drug loading and penetration

5.8.1 The drug load should meet the requirements of Table 1.

7.5 Dipping and peeling

According to the provisions of 4.19 in GB/T 17657-2013.

7.6 Static bending strength and elastic modulus

According to the provisions of GB/T 17657-2013, 4.7.

7.7 Formaldehyde emission

According to the relevant regulations of GB 18580-2017.

7.8 Drug loading and penetration

7.8.1 When determining the content of each active ingredient of the preservatives listed in Table 1, copper, copper oxide, DDAC, BAC, tebuconazole, propiconazole and boron The relevant regulations of GB/T 23229 shall be carried out; chromium trioxide and arsenic pentoxide shall be carried out according to the provisions of Chapter 8 and Chapter 9 in SB/T 10404-2006.

HDO is carried out according to the relevant regulations of AWPAA34-14; DCOI is carried out according to the relevant regulations of AWPA A30-18; Imidacloprid is carried out according to the relevant regulations of AWPA A30-18 The relevant regulations of AWPAA43-20 shall be carried out; DPAB shall be carried out according to the relevant regulations of AWPAA36-20 and AWPAA37-17.

7.8.2 Penetration shall be carried out in accordance with the regulations of LY/T 2374-2014.

8.1 Inspection classification

Product inspection is divided into factory inspection and type inspection.

8.2 Factory inspection

Ex-factory inspection includes inspection of specifications, dimensions and deviations, appearance quality, moisture content, bonding strength, and penetration.

8.3 Type inspection

8.3.1 In addition to all the items of the factory inspection, the type inspection should be increased by immersion peeling, static bending strength and elastic modulus, drug loading, formaldehyde Release inspection.

8.3.2 Periodic inspections during normal production throughout the year are generally not less than twice. Type inspection should be carried out in one of the following situations.

a) When the product is finalized and appraised;

b) When there are major changes in the production process and the types of raw and auxiliary materials;

c) When production has been suspended for more than three months and production is resumed;

d) When a major quality problem is found in the factory inspection;

e) When required by the quality supervision department.

8.4 Sampling and determination rules

Specifications and deviations, appearance quality, moisture content, bonding strength, immersion peeling, static flexural strength and elastic modulus, and formaldehyde emission The sampling and determination rules shall be carried out in accordance with the provisions of 7.2 and 7.3 of GB/T 9846-2015.

The sampling of drug loading and penetration shall be conducted in accordance with the provisions of 7.2.3 of GB/T 9846-2015. The drug loading and penetration rate are judged according to 5.8 The relevant provisions of the […]

8.5 Comprehensive judgment

The specifications and deviations of the same batch of sampled products, appearance quality, moisture content, bonding strength, immersion peeling, static bending strength and elastic modulus, When the formaldehyde emission, drug loading and penetration test results meet the requirements of this document, the product is judged to be qualified, otherwise it is judged to be unqualified.

8.6 Product measurement

According to the provisions of GB/T 9846-2015, 7.5.

9.1 Identification

The identification of the product should include the product name, preservative type, use classification, manufacturer name or trademark, etc., and should also include Formaldehyde emission.

9.2 Packaging

Products should be properly packaged according to different tree species, specifications and usage classifications. Each package should be accompanied by the product name, veneer tree species and thickness The inspection label of the degree, the type of preservative, the classification of use, the name of the manufacturer, the trademark, the size of the format, the quantity, and the product standard number. Should include the amount of formaldehyde released.

9.3 Storage and transportation

Products should be laid flat during storage and transportation to prevent contamination and mechanical damage.