Novel coating simplifies installation

Edited by the Engineeringtalk editorial team Sep 9, 2003

Bolting up Viking Johnson couplings and adapters will be quicker and easier following the company's decision to introduce a new anticorrosion coating for nuts and bolts.

Bolting up Viking Johnson couplings and adapters will be quicker and easier following the company's decision to introduce a new anticorrosion coating for nuts and bolts.

Sheraplex, which replaces Rilsan, displays equivalent corrosion protection while offering enhanced mechanical properties.

It 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 are unchanged, avoiding confusion for customers during the change-over.

Another advantage of Sheraplex is that nuts and bolts with the coating are less inclined to bind in the threads when retightened - 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 WIS4-52-03.

Already widely used in the water industry for long-term anticorrosion protection, Sheraplex combines two proven coatings - a Sherardised layer of zinc/iron alloy overlaid with a polymeric barrier.