NSF Protocol 534

Evaluation of Formulations, Pre-products, Intermediate Products, Constituent Products, and Site-applied Products in Connection with the European Drinking Water Directive.

What is NSF Protocol 534?

This guideline evaluates the health effects of various pre-products, such as resins, stabilisers, lubricants, and colourants, to confirm their safety for use in products that come into contact with drinking water, and screened against EU’s revised Drinking Water Directive (DWD). NSF Protocol 534 covers a wide range of pre-products, including:

Individual ingredients of formulations: colourants, solvents, fillers, stabilisers, antioxidants, etc.
Mixtures: Examples include glass fibre sizing agents and masterbatches.
Pre-products: Such as plastic granulates.
Intermediate products: Including coating hardeners and ingredients for cementitious materials.
Site-applied products: Such as coatings.

Why NSF Protocol 534 is valuable for your business

If the pre-products are certified to NSF Protocol 534, compliance with the DWD requirements has already been screened. The need for any further technical evaluation (e.g., enhanced microbial growth) depends on the risk group, but in any event, pre-product suppliers will save downstream users time by already having taken care of formulation review and testing for leachable substances in your product.

Advantage	For product manufacturers	For pre-product suppliers
EU HS readiness	Uninterrupted business operations	Limited risk of substitution Added value for your customer
Supply chain resilience	Easily switch between certified pre-products Uninterrupted business operations	Increased opportunities for the EU market
Shorter time to certification	Up to 30% faster	Added value for your customer
Reduced costs	Optimisation of costs	Added value for your customer
Enhanced quality assurance	Minimised delays associated with pre-product certification failures	Added value for your customer

A streamlined certification process

Certification to NSF P534 has been designed to be as straightforward as possible, encompassing:

Technical review: An in-depth review of the ingredient/pre-product information.
Case-by-Case Testing: Tailored testing to meet the requirements of the EU Harmonised Standard.
Production Facility Audit: To further demonstrate your commitment to quality.

Regular testing is not required unless significant changes are made to the production process.

Once certified, pre-products are listed on NSF's public website, making it easier for manufacturers to source safe pre-products and establish a strong, compliant presence in the EU market.