Non-metallic materials in contact with drinking water in the UK must conform to British Standard (BS) to address regulations regarding. Find the most up-to-date version of BS at Engineering These Guidance Notes gives details of the BS tests and test sample The requirements for the suitability of non-metallic products are given in BS
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Non-metallic materials in contact with drinking water in the UK must conform to British Standard BS to address regulations regarding prevention of contamination of the drinking water supply.
Suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on the quality of the water the official be of BS may be long, but it does effectively describe the scope and purpose of the standard. BS includes five main test requirements, applied to all non-metallic materials in contact with drinking water:. Interestingly, there is no safety standard or testing applicable to metallic materials in contact with drinking water in the UK.
So non-metallic materials ns evaluated for extraction of metals, along with the four other tests listed above, but metallic materials are not evaluated for extraction of metals in the UK.
Odor and flavor This test is performed on individual materials to determine if the materials impart a discernible odor or flavor to the water.
British Standard BS 6920
A taste test panel is employed for the evaluation. The test is conducted with both chlorinated and non-chorinated water. After exposure to the water and a 1: After exposure, any increase in the color or turbidity of the water must be less than five Hazen units and 0. Extraction of metals A leaching test on all non-metallic materials is conducted.
A set list of metals is analyzed regardless of material type or formulation. The list of metals and maximum admissible concentration MAC of each is included 6902-1 Figure 1. Metallic materials are not evaluated under this test. Extraction of substances of concern to public health This test is also known as the cytotoxicity test. Bz are exposed to water and then the water is placed bss contact with mammalian cells to observe any toxic effects on the cells, in order to assess potential human toxicity.
This is a study of gross acute toxicity.
Growth of aquatic microorganisms Materials are placed into water that is saturated with dissolved oxygen and sealed into bottles. Over a period of seven to nine weeks, the dissolved oxygen levels are measured to determine if any aerobic microorganism growth has resulted in a decrease in the vs of dissolved oxygen in the water.
The mean dissolved oxygen difference MDOD between water exposed to the product and control is determined based on measurements taken in weeks 5, 6 and 7.
The MDOD must be less than 1. If after seven weeks the MDOD value is between 1. If the final MDOD value over weeks 5, 6, 7, 8 and 9 is less than 1. If the MDOD value is 1. If the arithmetic mean of the MDOD values from the three product samples is less than 2. The be and flavor, color and turbidityextraction of substances of concern to public health and extraction of metals tests are carried out 69201 the specified high temperature.
British Standard BS – WCP Online
Note that each of these tests is conducted on one material only, not on products consisting of multiple materials. So, there will be multiples of each of these tests for products that include multiple non-metallic materials in contact with the water supply, with each being a separate test on separate materials.
Note also that no formulation disclosure is required because the testing is applied in the same way for each non-metallic material regardless of material type or formulation. Ten samples of each material are required. A 690-1 may consist of more than one piece. The samples must also be no more than 12 months old at the date they are received at the test laboratory.
When shipped to the laboratory, the samples are typically placed into labeled, polyethylene bags, because samples labeled directly with adhesive tape, ink, etc. WRAS does not own or operate a testing laboratory.
WRAS approvals for fittings require both mechanical testing, as well as testing of non-metallic tests to BS WRAS approves these laboratories based on their participation in comparison tests conducted to ensure that approved laboratories achieve similar test results. The PAG meets about 20 vs each year to review the recently submitted WRAS approval applications and make a determination regarding acceptance. If the application is determined to be acceptable, then the WRAS issues the approval.
This directory can be found at https: Approvals are valid for five years. There are no manufacturing-facility audits required for WRAS approvals. Subscribe Subscribe Now Newsletter.