News
Viking Johnson's Better Bolt Up
Posted on 01st Mar 2003
Bolting up Viking Johnson couplings and adaptors will be quicker and easier following the company's decision to introduce a new anti-corrosion coating for nuts and bolts.
Sheraplex, which replaces Rilsan, displays equivalent corrosion protection whilst offering enhanced mechanical properties. Sheraplex has a PTFE coating that reduces friction between the threads of the fixings, so that the correct loading is achieved consistently and with less effort. Bolt torques will remain unchanged avoiding unnecessary confusion for customers during the change over period.
Another advantage is that Sheraplex-coated nuts and bolts are less inclined to bind in the threads when re-tightened - when fittings are dismantled and re-installed, for example.
Long-term vibration trials and salt spray testing to ASTM B117 have shown that Sheraplex is equivalent to Rilsan in all other key respects. It also complies with DIN50021, has WRAS approval, and achieves full coverage to WIS 4-52-03.
Already widely used in the water industry for long-term anti-corrosion protection, Sheraplex combines two proven coatings - a Sherardized layer of zinc/iron alloy overlaid with a polymeric barrier.
Viking Johnson will phase in Sheraplex-coated nuts and bolts across its range during the first half of 2003.
