NICKEL-FREE LOW TEMPERATURE SEAL

FINALLY NICKEL-FREE LOW TEMPERATURE SEAL WITH MEDIUM TEMPERATURE AGEING  OFFICIALLY PRESENTED AT ALUMINIUM TWO THOUSAND CONGRESS IN FLORENCE, 12-16 MAY 2015

The nickel-free HARDWALL EHR low temperature sealing process allows sealing of anodic oxide layers on aluminium and its alloys to be carried out at room temperature. The result is a perfect quality seal suitable for outdoor corrosion resistance including industrial and marine environments.
HARDWALL EHR is an ecological process completely free from nickel and other toxic compounds.
HARDWALL EHR requires an ageing step with HARDWALL EHR 2 to be done at a minimum temperature of 60 °C.

ADVANTAGES
Anodized aluminium is completely free from greenish shade that happens with nickel based products.
• Vastly reduced energy consumption compared with traditional sealing processes.
• No bloom residue on sealed product.
• The process is completely ecological.
• No toxic products.
• HARDWALL EHR process is composed of two liquid products very easy to be dosed. No dissolution of powder products.
QUALITY CONTROL
The tests passed for the sealing quality control are:
• Modified Dye Spot Test according to ASTM B-136.
• Acid dissolution test according to ASTM B-680.
• Weight loss test according to ISO 3210.
• All tests required by Qualanod