แนวคิด
This code covers polyolefin-based plastic wood products used as exterior residential decks. Plastic wood products are currently made mainly from recycled polyolefin plastics (especially high-density polyethylene), where the cross section of the product is more or less uneven. อย่างไรก็ตาม, the specification may also apply to similar plastic products made from other plastics and plastic composites with non-uniform cross sections. The performance requirements that the product should comply with include bending properties (allowing bending stress, effective elastic modulus and creep adjustment), dimensional stability during thermal expansion, ทนต่อสภาพอากาศ (changes in surface appearance and bending properties and moisture and heat cycling), fire resistance and skid resistance. The procedure for calculating the recommended span length of the support joist spacing is also detailed here.
ASTM D6662-2022 Standard Specification for Polyolefin Based Wood-Plastic Decorative Panels
รัศมี
1.1 This Code covers polyolefin-based plastic wood products used as exterior residential decks.
1.2 Plastic Wood products are currently made mainly from recycled polyolefin plastics (especially high-density polyethylene), where the cross section of the product is more or less uneven. อย่างไรก็ตาม, the specification may also apply to similar plastic products made from other plastics and plastic composites with non-uniform cross sections.
1.3 This specification details the procedure for calculating the recommended span length of the support joist spacing. The program was developed using experimental data from typical unreinforced plastic wood made primarily from recycled high-density polyethylene. Appendix X1 to this standard details methods for developing span lengths for other types and compositions of plastic wood.
ASTM D6662-2022 Standard Specification for Polyolefin Based Wood-Plastic Decorative Panels
1.4 These values are expressed in inch-pounds as these are currently commonly used units in the construction industry. Equivalent SI units are indicated in parentheses. อย่างไรก็ตาม, the units of irradiance exposure specified in the weather resistance section (6.3) are SI units, as these are the units commonly used for such tests.
1.5 มาตรฐานนี้ไม่ได้มีวัตถุประสงค์เพื่อจัดการกับข้อกังวลด้านความปลอดภัยทั้งหมด, ถ้ามี, ที่เกี่ยวข้องกับการใช้งาน. เป็นความรับผิดชอบของผู้ใช้มาตรฐานนี้ในการสร้างความปลอดภัยที่เหมาะสม, แนวปฏิบัติด้านสุขภาพและสิ่งแวดล้อม และเพื่อพิจารณาการบังคับใช้ข้อจำกัดด้านกฎระเบียบก่อนใช้งาน.
บันทึก 1: There is no similar or equivalent ISO standard.
1.6 มาตรฐานสากลนี้ตั้งอยู่บนหลักการมาตรฐานที่ได้รับการยอมรับในระดับสากลซึ่งกำหนดไว้ในการตัดสินใจเกี่ยวกับหลักการเพื่อการพัฒนามาตรฐานสากล, Guidelines and Recommendations issued by the Committee on Technical Barriers to Trade of the World Trade Organization.