On July 19, 2013, China National Building Materials Inspection and Certification Group Suzhou Co., Ltd., China Building Waterproof Association, and Building Materials Industry Technology Supervision and Research Center jointly applied for the revised national standard “Pre-Pave/Wet-Pave Waterproof Coil†(GB/T 23457) -2009), approved by the National Standardization Management Committee's "2013 First National Standards Revision Plan" document, revised to "Concrete mortar bonded waterproofing membrane Part 1 pre-laid waterproofing membrane", plan No. 20130895-T- 609, at the same time, the development of "concrete mortar bonded waterproof membrane wet-laid waterproof membrane", plan number 20130896-T-609.
The National Standards Commission requested relevant national professional standardization technical committees and major drafting units to implement and implement the plan, strengthen coordination with relevant parties in drafting standards, widely listen to opinions, ensure the quality and level of standards, and complete the national standard revision and revision tasks on time.
Countersunk Head Self-Drilling Screws
Stainless steel self-drilling screws made of stainless steel material, They are manufactured with a drill bit tip to eliminate the need to drill pilot holes. Often called "tek" points, the bit tips come in various sizes: #1, #2, #3, #4, and #5 point. The larger the tip size, the thicker the metal it can drill through before a pilot hole is needed. Flat head style or "countersink" leaves a clean profile on whatever material you're attaching them with.
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