NSF ANSI CAN 372:2020 pdf download.Drinking Water System Components -Lead Content.
NSF ANSI CAN 372 applies to any drinking water system component that conveys or dispenses water for human consumption through drinking or cooking.
1.3 Normative references
The following documents contain requirements that, by reference in this text, constitute requirements of this Standard. At the time this Standard was balloted, the editions listed below were valid. All documents are subject to revision, and parties are encouraged to investigate the possibility of applying the recent editions of the documents indicated below. The most recent published edition of the document shall be used for undated references.
ASTM E29-13 (2019), Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
ASTM E255-07 (2014), Standard Practice for Sampling Copper and CopperAlloys for the Determination of Chemical Corn position
EPA SW 846, Test Methods for Evaluating Solid Waste, Physical Chemical Methods, Method 3050 B — Acid Digestion of Sediments, Sludges, and Soils
EPA SW846, Method 3052 — Microwave Assisted Acid Digestion of Siliceous and Organically Based Matrices
EPA SW 846, Method 6010C — Inductively Coupled Plasma-Atomic Emission Spectrometiy
Safe Drinking Water Act
1.4 Significant figures
For determining conformance with the specifications in this Standard, the Rounding Method in ASTM E294
shall be used.
2 Definitions
2.1 coating: A covenng or barrier applied to a substrate by electro, chemical deposition or via mechanical adhesion (paint).
2.2 liner: A barrier component which is mechanically attached and sealed to prevent water contact with another component. (Example: a tubular or cast brass spout with a thermoplastic sleeve inserted inside and sealed with an 0-ring or other sealing material, such that water does not come into contact with the brass spout material.)
3 General requirements
Solders and fluxes shall have a lead content less than or equal to 0.2%. All other products shall have a weighted average lead content less than or equal to 0.25% based on the average of their wetted surface areas.
3.1 All components <=0.25% If each component of a product has a wetted surface with a lead content of not more than 0.25%, then the product is considered compliant and no further evaluation is required. 3.2 Any components > 0.25%
If any wetted components of a product have a surface area with a lead content of more than 0.25% lead, then the weighted average lead content shall be calculated according to Section 4 to determine compliance.
3.3 Restriction on the use of lead containing materials
There shall be no lead added as an intentional ingredient in any product, component, material, or their coatings submitted for evaluation to this standard with the exception of brass or bronze meeting the definition of “lead free” under the specific provisions of the Safe Drinking Water Act5 of the United States.
4 Weighted average lead content calculation
The weighted average lead content of the product shall be calculated using the surface area and lead content information established under Section 4.1. For internal NPT (pipe) threads, engagement of male components into female threads will assume that 25% of the length of the female thread remains exposed as wetted surface area.
All of the wetted surfaces are to be included in the weighted average lead content calculation, not just those surfaces that contain lead.
The results of the weighted average lead calculation shall be rounded to two decimal places prior to determination of compliance.
4.1 Component surface areas and lead content
The followina information shall be established to determine the weiahted averaae lead content.NSF ANSI CAN 372 pdf downlaod.