Which manufacturing method for PEX is recommended for hot and cold potable water?
There are currently three methods for producing PEX tubing, the Engle or Peroxide method, the E-beam or radiation method and the Silane method. All three processes produce tubing cross-linked to varying degrees that result in a product acceptable for potable water distribution applications. All PEX that has been tested and certified for potable applications carries the mark(s) of nationally recognized third-party certification agencies such as NSF, IAPMO, ICBO-ES, Warnock Hersey or UL. How long can PEX be exposed to sunlight? PEX tubing is not intended for outdoor applications and must be stored in a covered environment not exposed to direct sunlight. Maximum UV exposure is no more than 60 days. What are temperature limitations for PEX? PEX tubing can be used up to 200°F for heating applications. For plumbing, PEX is limited to 180°F. Temperature limitations are always noted on the print line of the PEX tubing. Recommended 140 max for safety and conservation How are PEX systems tested
