Construction products: Assessment of release of dangerous substances. Guidance on the statistical assessment of declared values-Principles and rules of application
建筑产品:危险物质释放的评估 申报价值统计评估指南
BS PD CEN/TR 16797-1:2015 provides guidance on the statistical assessment of declared values with respect to the
release, emission and/or content of dangerous substances. This Technical Report 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. The first approach is to use assessment by variables and this approach requires the data to be
normally or log-normally distributed. This approach is recommended as the default option. The alternative
approach based on assessment by attributes is appropriate for data sets that are not normally or log-normally
distributed. The downside to this form of assessment is that more test data are needed for the same level of
reliability. The present document introduces these assessment procedures and CEN/TR 16797-2 provides
more detail and the statistical proof that they satisfy the principles defined in this document. With both of these
approaches the minimum frequency of testing is a function of the distance between the mean value and
declared value and the variability of the data set, i.e. the sample standard deviation.To reduce the costs of testing, production plants producing a similar product may share data, e.g. be grouping
the product into clusters for statistical assessment of declared values. Rules for the use of clusters are given
in CEN/TR 16797-2.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.Cross References:CEN/TR 16797-2:201589/106/EECRegulation (EU) No 305/2011All current amendments available at time of purchase are included with the purchase of this document.