PD CEN/TR 16797 provides a brief introduction as to how to declare performance for the potential release, emission and/or content of dangerous substances from or in construction products and gives the principles which underpin the acceptance criteria of test results in relation to a declared value.
PD CEN/TR 16797-1 is the first part of the series that provides guidance on the statistical assessment of declared values with respect to the release, emission and/or content of dangerous substances.
PD CEN/TR 16797-1 provides statistically based criteria for type-testing (TT), further-testing (FT) and where a product has been shown to be consistent with measured values for the release, emission or content that are significantly below the declared values, the point where no-further-testing (NFT) is permitted.
A series of fundamental principles are defined in the present document and two statistical approaches are defined:
CEN/TR 16797-2 also contains rules for identifying outliers within a data set and guidance on using tests other than the reference method for FT.
A list of tasks for product technical committees is given in CEN/TR 16797-2 as is a model clause for including in product standards and rules of applications that may be cited in the product standard or copied into product standards.
PD CEN/TR 16797-1 on construction products is useful for:
PD CEN/TR 16797-1 was developed on the basis of experience with the control of release into soil and water. As it is an assessment of data against a declared value regardless of the source of the data, these procedures are also valid for the assessment of emission from construction products into indoor air and assessment of gamma radiation from construction products.
The purpose of PD CEN/TR 16797-1 is to offer arguments and principles for any declared value relating to the potential release, emission, and/or content of harmful substances from or in construction materials.
The variable test frequency provided by PD CEN/TR 16797-1 acts as an incentive to producers to control their products and reduce the environmental impact.
Thus, PD CEN/TR 16797-1 introduces the rules of application and rule of application based on the assessment by variables, rule of application for products where the test values are significantly below the declared value (gamma rule) and rule of application based on the assessment by attributes.
In this way, manufacturers must declare information about their products’ performances in a unique harmonised way to fit the national requirements. The statistical analysis can ultimately contribute to preventing adverse negative effects on the environment.
CEN/TR 16797-1:2015