DEWELD

ALLGAL TECHNICAL NOTES

Benefits of Allgal:

Allgal coating minimises ongoing maintenance costs.
High strength for superior service performance.
Rounded edges on yard rail to minimise risk of injury
to livestock.
Clear-Tec polymer coating to protect against surface
contaminants and white rust.
Lightweight, easy to handle and transport.
Electrogalvanised inside and outside for longer service
life.
Environmentally friendly coatings.

The Allgal Family
The ALLGAL family refers to tube and pipe that has the special ALLGALR duplex coating. The ALLGAL products are manufactured from hot rolled steel strip that’s electrogalvanized on both sides in the OrrconTM state of the art electrogalvanizing plant. This process applies an even, continuous coating of zinc to steel. The strip is then formed into tube and welded along the seam. The weld area is re-coated with a zinc/aluminium alloy to replace the material that the welding has burnt away. The external surface of the tube is coated with a special clear polymer coating called Clear-Tec. It is the combined action of the electrogalvanized and polymer coatings that gives the product a duplex coating, and unlike traditional prime painted tubulars, the ALLGAL system, also offers a protective electrogalvanized coating on the inside. ALLGAL is manufactured and tested to meet the requirements of Australian Standard AS1163-1991 Structural Steel Hollow Sections C350L0 (dual grade) and AS 4750 (INT) -- 2000 Electrogalvanized (zinc) coatings on ferrous hollow sections. ALLGAL has a total minimum zinc coating weight (total amount distributed over both surfaces) of 100g/m2. A top coat of Clear-Tec is then externally applied. This document is chiefly concerned with the features of the ALLGAL product range. Why use ALLGAL The ALLGAL coating combines the best qualities of the electrogalvanising and painting systems. This has several effects on the product’s performance.
Corrosion Protection
ALLGAL has been designed as a duplex system that is ready to use. It features a highly pure zinc coating over class 3 clean steel, with a high performance, specially formulated clear polymer coating called Clear-Tec. This coating system provides the following benefits. The Clear-Tec will protect the zinc from air and water, thus protecting it from corrosion. The Clear-Tec is more resistant to pH changes, pollutants and salt than bare zinc. The electrogalvanized coating remains shiny until the Clear-Tec breaks down. When the coating is removed in a small area (e.g. by a scratch), the surrounding zinc will corrode faster and protect the steel. This is known as a sacrificial (or cathodic) coating because the zinc is sacrificed to protect the steel.