PD CEN/TR 16797-2:2015

What is PD CEN/TR 16797-2 - Statistical background on release of dangerous substances about?  

PD CEN/TR 16797 provides more detailed background and technical explanation together with examples and the statistical justification for the rules of application. 

PD CEN/TR 16797-2 is the second part of the PD CEN/TR 16797 series of documents 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 16797-2 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 CEN/TR 16797-1 and two statistical approaches are defined: 

• The first approach is to use assessment by variables and this approach requires the data to be normally or log-normally distributed 
• The alternative approach based on the assessment by attributes is appropriate for data sets that are not normally or log-normally distributed 

PD 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 PD 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. 

Who is PD CEN/TR 16797-2 - Statistical background on release of dangerous substances for? 

PD CEN/TR 16797-2 1 on construction products is useful for: 

• Construction industry 
• Construction Products Regulation Authority 
• Product technical committees  
• Certification bodies 
• Regulatory bodies 

Why should you use PD CEN/TR 16797-2 - Statistical background on release of dangerous substances?  

PD CEN/TR 16797-2 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, the procedures are also valid for the assessment of emission from construction products into indoor air and assessment of gamma radiation from construction products. 

PD CEN/TR 16797-2 specifies the quality level of performance with respect to the release, emission or content of regulated dangerous substances (RDS). 

PD CEN/TR 16797-2 covers the test methods for statistical assessment of declared values for RDS, assessment by variables, assessment by attributes and statistical principles of the rules of application. 

Thus, PD CEN/TR 16797-2 aims to provide guidance to product technical committees and information to regulators on the statistical assessment of declared values/classes for release, emission or content of dangerous substances.