NSF/ANSI 347 refers to the Sustainability Assessment for Single Ply Roofing Membranes , a standard developed by NSF International.
While you mentioned "2021," it is important to note that the most significant recent version is NSF/ANSI 347-2012a (i1)
, which provides a framework for evaluating the environmental performance and sustainability of single-ply roofing products. Key Details of the Standard
: It establishes a consistent set of environmental, social, and economic performance metrics for the roofing industry.
: Covers various single-ply roofing materials, evaluating them across several product life-cycle stages. Certification Levels nsfs 347 2021
: Products can achieve different levels of certification (e.g., Bronze, Silver, Gold, Platinum) based on their point scores in specific categories. Evaluation Categories
The assessment typically awards points based on criteria such as: Product Design
: Use of recycled content and environmentally preferable materials. Product Manufacturing
: Energy efficiency, water conservation, and waste management during production. Membrane Durability NSF/ANSI 347 refers to the Sustainability Assessment for
: The expected service life and performance of the roofing material. Corporate Governance
: Social responsibility and sustainability reporting from the manufacturer. Innovation
: Extra credit for novel sustainability features not covered in other sections.
If you are looking for a specific research paper published in The 2021 revision replaces all prior versions (2017,
Subject: Mechanical Couplings for Joining Thermoplastic Pressure Piping Systems Publisher: NSF International Status: Active Standard
Gaskets must meet ANSI/ASME B16.21 or ISO 7483 dimensions, with a new allowance for thermal expansion in PTFE-based materials. The 2021 edition adds a maximum warpage of 0.5 mm per 100 mm of gasket length.
NSFS 347 2021 refers to the 2021 edition of NSF/ANSI/CAN 347, a North American standard titled “Safety and Performance Requirements for Nonmetallic Gaskets for Use in Water and Wastewater Systems.”* Developed by NSF International (formerly the National Sanitation Foundation), this standard specifically governs nonmetallic gaskets used in piping, fittings, valves, and other appurtenances that come into contact with:
The 2021 revision replaces all prior versions (2017, 2013, etc.), introducing updated chemical extraction limits, mechanical performance tests, and stricter material safety criteria.
To verify compliance, NSFS 347 mandates a rigorous test protocol, including: