Report No DWI0792

REVIEW OF MATERIALS TESTING PROCEDURES LABORATORY TESTING REPORT (November 1995 to Spring 1997)

DWI0792

May 1997

EXECUTIVE SUMMARY

Conclusions.

  1. Flavour and Odour Assessments. If the agreed revisions for prEN 1420-1, (following the first Formal Vote) are accepted at the 2nd Formal Vote stage, the extraction sequence would appear to give similar or worse (fail safe) result to the current UK method using the UK surface area/volume test ratio and test criteria. On this basis the UK could probably accept the extraction method in this draft.
  2. The outstanding problems relate to the different surface area to volume ratios specified in prEN 1420-1 and how the results obtained using these will be interpreted - the current BS 6920 test criteria couldn't be applied in this case.

    Odour assessment, not a current UK requirement is a useful method for screening out materials without undertaking the Taste Test (an advantage in terms of both Health and Safety of Tasters considerations and costs).

  3. Chlorine Demand. Not currently a formal UK test requirement, this test provides useful additional information about the suitability of materials for use with potable water. Any further consideration/progress. however, should be delayed until a common approach to testing has been agreed in Europe.
  4. TOC Determinations. Now a DWI CCM requirement, this test provides useful information about migration from materials. It could easily be added as an additional requirement to Part 4 of BS 6920 (GCMS General Scan method).
  5. Site Applied Products - Alternative Cure Periods. The results reported confirm previous results (from commercial testing) on the usefulness of the Taste of Water Test in assessing the comparability of different cure conditions for Site Applied Products.

Copies of this report may be available as an Acrobat pdf download under the 'Pre 2000 Reports' heading on the DWI website.