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GB/T 5849-2016 Blockboard and ISO 13609:2014 Wood-baThe main technical differences between sed panels - Plywood - Blockboards and battenboards are as follows:
1. Dimensional deviation
1) Flatness requirements are included in GB/T 5849-2016 but not in ISO 13609:2014;
2) For length and width deviation items, GB/T 5849-2016 only allows positive deviations, while ISO 13609:2014 allows negative deviations;
3) Regarding thickness deviation, GB/T 5849-2016, because it applies only to solid blockboard, defines thickness deviation in only two grades based on base thickness. ISO 13609:2014 defines thickness deviation in five grades, and the thickness deviation varies with the base thickness index value. For example, for two common blockboard thicknesses in China, 12 mm and 15 mm, GB/T 5849-2016 has stricter requirements for thickness deviation. my country is a major exporter of blockboard, and considering the requirements for secondary processing of blockboard, the Chinese standard imposes stricter requirements on dimensional deviation, ensuring product quality and promoting the sustainable development of export trade.
2. Moisture content GB/T 5849-2016 requires that the moisture content of fine wood panels should be 6% to 14%, and ISO 13609:2014 requires it to be 8% to 14%.
3. Gluing Quality: GB/T 5849-2016 specifies different requirements for the gluing strength of blockboard based on type and species, while ISO 13609:2014 provides unified technical requirements for gluing strength, which do not vary by type or species. GB/T 5849-2016 requires that the gluing strength test for blockboard be conducted by immersing the specimen in water at (63±3)°C for 3 hours and cooling it at room temperature for 10 minutes before testing. The pretreatment conditions are simple. ISO 13609:2014, however, uses the same pretreatment conditions for gluing strength test specimens as ISO 13608:2014, but adds vacuum pressurization and steam treatment compared to GB/T 5849-2016. GB/T 5849-2016 only allows for a lowering of the index value when the wood damage rate exceeds 80%, and the wood damage rate of the specimen is estimated by visual inspection. ISO 13609:2014, on the other hand, defines acceptable and unacceptable limits for average shear strength and wood failure rate. It also requires that samples be dried before wood failure rate determination, and specifies the drying temperature and time, light source, angle of incidence, and distance between the sample and the light source. ISO 13609:2014 offers greater reproducibility in wood failure rate determination.
4. Formaldehyde Emissions: GB/T 5849-2016 directly references GB 18580, "Limits of Formaldehyde Emissions from Artificial Boards and Their Products for Interior Decoration and Renovation Materials." This mandatory national standard, GB 18580-2017, which came into effect on May 1, 2018, specifies that formaldehyde emissions be measured using the climate chamber method, which is essentially consistent with ISO 12460-1.
Source: Zheng Honglian, Liu Xudong, Gu Qiang, Deng Chao. Comparative analysis of Chinese national standards and ISO standards for plywood products[J]. Wood Industry, 2020, 34(5):44-48.