GB/T 9846-2015Plywood for general use (English PDF)

3.1 Class I plywood

It refers to the weather fastness plywood for outdoor use which can pass the boiling test.

3.2 Class II plywood

It refers to the water-resistant plywood for wet conditions which can pass the 63 °C ± 3 °C hot water immersion test.

3.3 Class III plywood

It refers to the non-moisture resistant plywood for dry conditions which can pass the 20 °C ± 3 °C cold water immersion test.

3.4 Plywood tree species

Plywood panel tree species is this plywood tree species.

5.1 Specifications dimensions and their deviations

5.1.1 Specifications dimensions

5.1.2 Dimensional deviation

5.1.2.1 Plywood length and width deviation. ± 1.5 mm/m, maximum ± 3.5 mm.

5.2 Appearance quality

5.2.1 Grading

5.2.1.1 In accordance with the quantity and range of the visible material defects and processing defects on the finished panel, the plywood is divided

5.2.1.2 In accordance with user needs, it may produce the plywood which is composed of the panels and back plates of different grades. […]

5.2.2 Allowable defects

5.2.3 Panel splicing

5.2.3.1 As for the excellent grade panel having a panel width within 1220 mm, the panel shall be an individual panel OR two veneers spliced at appropriate center of the panel, AND the splicing joint shall be tight. When the excellent grade panel is spliced, the color shall be appropriately matched AND the texture shall be similar.

5.2.4 Repair

5.2.4.1 As for such defects as dead knot, hole, crack, and so on, they shall be filled with putty AND then sanded smooth for repair.

5.3 Physical and chemical properties

5.3.1 Moisture content

The moisture content of plywood shall be in accordance with Table 6.

5.3.2 Adhesive strength

5.3.2.1 The adhesive strength index value of the plywood shall comply with the provisions of Table 7.

5.3.2.2 The adhesive strength index value of the plywood which is made by different tree species shall be taken as the minimum index value of the adhesive strength of all tree species.

5.3.3 Impregnation stripping

When the direction of the adjacent veneer texture of the plywood is same, it shall be subjected to impregnation stripping test.

The accumulated stripping length at each side of the same glue layer of each sample shall not exceed 25 mm.

5.3.5 Formaldehyde emission

In accordance with the provisions of GB 18580.

5.4 Other technical requirements

5.4.1 Usually the wood texture of the adjacent two layers of veneers shall be basically vertical to each other.

5.4.2 The veneers of the symmetrical layers on both sides of the center layer shall be of the same thickness, the same tree species or similar tree species with the same physical properties, the same production method (i.e., all of which is rotary cut or sliced), AND meanwhile the wood texture configuration direction shall also be same.

5.4.9 The inner veneer of the plywood may include spliced or non-spliced veneer of any width.

6.1 Specification dimension measurement

6.1.1 Gauge

Gages include.

6.1.2 Measurement of plate length, width and thickness

In accordance with the relevant provisions of GB/T 19367-2009.

6.1.3 Measurement of perpendicularity

In accordance with the relevant provisions of GB/T 19367-2009.

6.2 Sampling and dimension requirements

6.2.2 Sample sawing

6.2.2.1 From each of the plywood for testing, CUT three 600 mm × 600 mm samples in accordance with Figure 1.

6.3 Test methods

6.3.1 Appearance quality

6.3.1.1 USE visual inspection or steel plate (accuracy 0.1 mm) to measure the appearance defects of the plywood.

6.3.2 Moisture content

In accordance with the provisions of clause 4.3 in GB/T 17657-2013.

6.3.3 Adhesive strength

In accordance with the provisions of clause 4.17 in GB/T 17657-2013.

As for the plywood for which the thickness of the panel (thickness of the veneer before the adhesive compression) is greater than 1 mm, it shall use the type A sample size; as for the plywood for which the thickness of the panel is less than 1 mm (inclusive), it shall use the type B sample size.

6.3.4 Impregnation stripping

In accordance with the provisions of clause 4.19 in GB/T 17657-2013.

6.3.5 Static flexural strength and elastic modulus

In accordance with the provisions of clause 4.7 in GB/T 17657-2013.

6.3.6 Formaldehyde emission

In accordance with the provisions of GB/T 18580.

7.1 Classification of inspections

7.1.1 Product inspection is divided into exit-factory inspection and type inspection.

7.1.2 The exit-factory inspection includes the following items.

7.1.3 In addition to all the exit-factory inspection items, the type inspection also includes the impregnation peeling, static flexural strength and elastic modulus inspection. A type inspection shall be carried out in any of the following cases.

7.2 Sampling plan

7.2.1 Appearance quality inspection

It uses the once sampling plan of the general inspection level II and acceptance quality level (AQL) 4.0 as specified in GB/T 2828.1-2012, as shown in Table 10.

7.3 Judgement rules

7.4 Comprehensive judgment

When the appearance quality, specification dimension, its deviation, and physical and chemical properties of the sample comply with the corresponding grade requirements, this batch of product is judged as qualified; otherwise it will be degraded OR judged as disqualified.

7.5 Metering of products

Plywood shall be calculated in cubic meters, AND its tolerances shall not be taken into account. When measuring and calculating an individual plywood it may be accurate to 0.00001 m³; when calculating a batch of plywood, it may be accurate to 0.001 m³.

8.1 Marking

8.2 Packaging

Products shall be respectively and appropriately packaged based on different types and specifications. Each package shall be accompanied by a test label indicating the name of the product, panel and core plate tree species and thickness, class, grade, manufacturer name, trade mark, dimension, quantity, product standard number, and formaldehyde release limit marking.

8.3 Transportation and storage

In the transportation and storage process of the product, it shall pay attention to moisture proof, rain proof, sun exposure proof, and anti-deformation. […]