In this article:
- Automotive Industry: why OEMs are already demanding PFAS Free coatings
- LAURENTCOAT PURA®: the water-based, PFAS Free alternative for zinc flake systems
- PURA X1, X2 and X3: choose the variant for your friction specification
- LAURENTCOAT PURA® applications in the automotive industry
More and more fastener manufacturers are facing the same situation: an OEM customer updates their technical specification and requires a PFAS Free topcoat with a defined friction coefficient. The production process does not change — but the coating does.
LAURENTCOAT PURA® was developed to meet that need: controlling the friction coefficient required by OEM specifications.
Automotive Industry: why OEMs are already demanding PFAS Free coatings
PFAS are synthetic compounds that persist in the environment. The European Union is moving toward a broad restriction, and automotive OEMs are already updating their technical specifications accordingly.
For fastener manufacturers that export or are part of international supply chains, meeting these new requirements is the concrete challenge. LAURENTCOAT PURA® is the answer.
LAURENTCOAT PURA®: the water-based, PFAS Free alternative for zinc flake systems
LAURENTCOAT PURA® is a family of water-based, PFAS Free topcoats applied over the LAURENTCOAT® basecoat in zinc flake systems.
Technical specifications:
- Thickness: 2–4 µm
- Low-temperature curing: 80–90 °C
- Application: Dip Spin process
- Resistance to automotive solvents and fluids
PURA X1, X2 and X3: choose the variant for your friction specification
The friction coefficient defines the behavior of a fastener during tightening. LAURENTCOAT PURA® is offered in three variants to cover different friction windows according to the required specification:
| Product | Friction coefficient (µ) | Specifications |
| LAURENTCOAT PURA® X1 | 0.06 – 0.09 | GM-3359 · IVECO 181101 |
| LAURENTCOAT PURA® X2 | 0.08 – 0.14 | Daimler-Chrysler PS-5873L · VW TL-245 |
| LAURENTCOAT PURA® X3 | 0.10 – 0.16 | FIAT 957513 · Ford WSSM21P36 |
LAURENTCOAT PURA® was designed under the standards of ISO 16047.
LAURENTCOAT PURA® applications in the automotive industry
LAURENTCOAT PURA® is applied on threaded fasteners: screws, nuts, bolts, studs and fastening elements that require precise friction coefficient control during assembly.
These fasteners are used in the most critical systems of the vehicle:
- Chassis and subframe
- Suspension
- Brakes
- Steering and wheels
- Engine and drivetrain
- Safety systems and cabin
- Automotive aftermarket
In each of these applications, the behavior of the fastener during assembly — and its corrosion resistance in service — depends directly on the coating applied.
At CHOUSA we have over 65 years of experience applying surface treatments for industry.
Do you have a specification to meet or need to define the friction window for your fasteners?
You can contact us at info@chousa.com.ar and get in touch with our technical team.