The TL180 specification, which applies to various kinds of fasteners –including metric parts, outlines Volkswagen’s high performance standard for black zinc flake finishes.
Volkswagen’s TL180 specification has some of the most complex corrosion protection and colour stability requirements. In addition to these high corrosion protection and chemical resistance demands, the most challenging aspect is achieving Volkswagen’s desired coefficient of friction properties and heat loosening requirements.
When Volkswagen updated its TL180 specification, it simplified the pretreatment process. In response, Atotech was able to introduce simplified approved coating sequences to further improve performance standards. The latest developments in zinc flake coatings from Atotech include the Zintek® 300 HP black base coat and Techseal® Black SL VA/Techseal® Black S T top coats, which help to reduce the number of chemicals compared to the previous systems.
Zintek 300 HP is Atotech’s high performance black base coat, with excellent corrosion protection, increased delay of white corrosion, and top notch drying and flowing characteristics. With these features, Atotech states that its Zintek 300 HP is the best base for black zinc flake finishes. To fulfil VW’s strict assembly requirements, a sophisticated top coat is also needed: Techseal Black SL VA.
This organic top coat, with a semi-bright deep black appearance, provides very good coverage and chemical resistance. Most importantly, it meets the challenging requirements for multiple mounting on e-coat and aluminium with low deviation and, simultaneously, limited heat loosening properties.
For parts that require a lubricant-free finish according to TL180, Atotech offers Techseal Black S T, an approved finish that provides exemplary chemical resistance along with an attractive black matt appearance. The ductile coating can be used for clips and clamps, as well as other fasteners, and is compatible with patch lockers. Both of these approved top coats show minimal signs of abrasion.
With these outstanding finishes, Atotech supplies the leading zinc flake process for VW TL180. Well received by many applicators, the process has been praised as the best approved system with the highest performance standard and easiest handling process.
Will joined Fastener + Fixing Magazine in 2007 and over the last 12 years has experienced every facet of the fastener sector – interviewing key figures within the industry and visiting leading companies and exhibitions around the globe. Will manages the content strategy across all platforms and is the guardian for the high editorial standards that the brand is renowned.
