A brief introduction of WPC standard in domestic and abroad

1. The UAS

In the early 1990s, the United States created a small number of small-scale wood enterprises. With the widespread use of plastic products, on the urgent need to have an accurate determination of the physicochemical and mechanical properties of wood product specification. Initially, manufacturers using test method to measure the characteristics of a synthetic resin material, and later found not accurately reflect the performance of such products. Because these tests are small specimens. In July 1993, for the development of the standards required to adapt to wood products, American Society for Testing Materials ASTM Technical Committee established WPC, has developed a wood compression performance, flexible material, density, creep, linear coefficient of thermal expansion and other relevant standards.

2. Canada

Currently, Canada has not seen wood of national standards, but its supplies of wood products center 2 Specification "06522 thermoplastics and wood composite rectangular outdoor decking (solid section) Technical specifications" and "06525 cellulose / polymer composite outdoor decking (hollow sections) technical specifications. "
Both specifications and test methods for physical and mechanical properties of wood products were the norm. Most use the ASTM standards.

3. Europe

Plastic Professional Committee organized the drafting of the European Committee for Standardization "WPC" specifications. It is divided into three parts:
(1) Testing methods for WPC and product characteristics
(2) Characteristics of WPC materials
(3) Characteristics of WPC products

4. China

In recent years, China's wood industry to conform to the emphasis on the recycling of resources, enhance environmental protection and energy conservation situation has entered a stage of rapid development, expanding exports, in this context, as soon as the development of national standards is increasing high, through the analysis of domestic and international standards have wood Experiences:

(1) For a new industry, in order to facilitate internal and external trade and international exchanges and communication, first wood-related terms and phrases have a unified specification.

(2) For wood products, it has the dual characteristics of wood and plastic, but its performance can not simply apply the relevant standards of all plastic or wood. Standards must be developed in accordance with the relevant performance characteristics of wood.

(3) At present wood products due to different purposes, different quality plastics, wood and plastic in different proportions, resulting in a wide variety of wood-plastic composite materials, performance requirements vary, and therefore can not use a standard WPC profiles to cover. Need to develop a variety of performance standard test methods.

Currently the main criteria

1 .ASTM 7031 "wood - plastic composite products of mechanical and physical properties of the evaluation criteria guide"
2 .ASTM 7032 "WPC decking and fence systems (guardrails or handrails) standards established performance level"
3. "AC109 acceptance criteria thermoplastic composite wood products"
4. "AC174 grade span decking and guardrail systems (guardrail and handrail) the acceptance criteria"
5. LY / T 1613 "extruded plastic composite sheet"
6. BB/T0020 "Combined wood-tray"
7. DB44 / T 349-2006 "WPC technology"
8. DB44 / T411-2007 "WPC inspection and test methods"