GB/T 35216-2017 in English
VALIDStructural plywood
- Issued on:2017-12-29
- Implemented on:2018-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
Price(USD)：
$310.00
$301.00
$301.00
《GB/T 35216-2017结构胶合板》由TC41（全国木材标准化技术委员会）归口，TC41SC4（全国木材标准化技术委员会结构用木材分会）执行，主管部门为国家林业和草原局。
Introduction
Analysis of the core content of the standard
| Performance indicators | Type I plywood | General requirements |
|---|---|---|
| Bond strength (MPa) | ≥1.00 | ≥0.70 |
| In-plane shear strength (MPa) | ≥3.2 | |
| Elastic modulus (104MPa) | 5.0-8.0 | |
Key performance test methods
Static bending strength test
The four-point bending method is used, and the universal mechanical testing machine is used. The specimen length must meet 50 times the basic thickness, and the loading speed is controlled below 14.7MPa/min. Calculation formula:
σ = 3PL/(2bh2)
Where P is the failure load, L is the support spacing, b is the specimen width, and h is the thickness.
Material structure requirements
- The textures of adjacent layers of veneers should be perpendicular to each other
- Symmetrical layers of veneers should be of the same species and thickness
- The thickness of the surface layer accounts for 40%-70%
- When the thickness is ＞24mm, the number of layers must be ≥7
Quality judgment rules
| Item | Qualification standard | Re-inspection threshold |
|---|---|---|
| Bond strength | Qualified specimens ≥90% | 70%-90% |
| Moisture content | Qualified specimens ≥90% | 70%-90% |
| Formaldehyde emission | Meet the limit of GB 18580 | |
Suggestions for the implementation of the standard
- Give priority to products that have passed the thermal durability test (800-900℃ flame for 10 minutes without separation)
- Pay attention to the performance difference between thickness classification (ES grade) and strength classification (F grade)
- The calibration certificate of testing equipment such as Bunsen burner should be checked during project acceptance
- Keep flat during storage to avoid moisture and deformation
Sample only — not a preview of GB/T 35216-2017
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