VW PV 3.10.7 Paints and Varnishes - Testing for Substances That Impair the Wetting Ability of Paint

The standard “VW PV 3.10.7 Paints and varnishes - Test for substances that impair the wetting ability of paint” developed by the Volkswagen automobile company describes a test method for substances that impair the wetting ability of vehicle paint.

Examples of substances that impair paint wetting include oils, greases, fluoride, waxes, and silicone. These negatively impact painting processes and are not permitted in the automotive industry or other manufacturing facilities.

Volkswagen's PV 3.10.7 standard is the most widely used test standard for substances that impair paint wetting ability. The components to be tested are placed on a glass plate and wetted with a solvent mixture. The solvent evaporates, and then the coating is applied to the test plate. If craters (displacements in the coating) form, the standard is not met. Other test specifications and standards use similar procedures.

In the competitive and demanding automotive industry, the reliability and aesthetic quality of plastic components are of critical importance. Among the numerous standards that guarantee the durability of these materials, the VW PV 3.10.7 standard plays a key role. This internal test specification, published by the Volkswagen Group, addresses the adhesion of coatings to plastic substrates, helping to verify the integrity of coated plastic parts used in vehicle interiors and exteriors.

This standard is a test procedure specific to the Volkswagen Group for evaluating the adhesion strength of coatings such as paints, varnishes, or films applied to plastic parts. It is used primarily during material qualification, production quality assurance, and supplier verification. The aim of this standard is to ensure that coatings applied to plastic components do not delaminate under mechanical or environmental stress throughout the vehicle's life cycle.

The basic test method defined in VW PV 3.10.7 is similar in principle to the standard “ISO 2409 Paints and varnishes - Cross-cut test” or “ASTM D3359 Standard test methods for adhesion rating by tape test” adapted to the specific material and application requirements of the VW Group.

The basic steps of the VW PV 3.10.7 standard are as follows:

• Sample preparation: Coated plastic parts are conditioned under specified environmental conditions (temperature and humidity).
• Incision pattern: A grid or lattice pattern (cross-cut) is made in the veneer using a multi-blade cutting tool or scalpel.
• Adhesive tape test: A standard adhesive tape is applied to the cross-cut area and then quickly peeled off.
• Assessment: The degree of coating separation is assessed visually and is usually graded on a predefined scale from 0 (no separation) to 5 (severe separation).

The performance requirements of this standard are specified as follows:

• The coating must demonstrate the minimum degree of adhesion as defined in the VW specifications. This ensures:
  • Resistance to mechanical wear
  • Stability against temperature changes
  • Integrity during transportation and installation
• Some variants in testing may include climatic aging or chemical exposure prior to adhesion testing to simulate real-world automotive conditions.

The VW PV 3.10.7 standard applies to various interior and exterior components such as:

• Instrument panel trim
• Door handles
• Mirror housings
• Bumper covers
• Decorative coatings

Applicable to parts manufactured from ABS, PC/ABS, PP or other automotive grade plastics receiving aesthetic or functional coatings.

The VW PV 3.10.7 standard is considered important for the following reasons:

• Quality assurance: Guarantees long-term durability of coated parts.
• Supplier verification: Helps verify that external suppliers meet the VW Group's stringent quality standards.
• Customer satisfaction: Prevents problems such as flaking, peeling or discoloration on visible vehicle components.
• Compliance with automotive norms: Compatible with broader automotive testing practices when adapting the protocol to VW Group vehicles.

As a result, the VW PV 3.10.7 standard is a critical standard in the automotive coatings field, ensuring strong adhesion of coatings on plastic parts used in Volkswagen vehicles throughout their service life. As vehicle aesthetics and durability continue to improve, adhering to such rigorous standards remains crucial for manufacturers, suppliers, and quality engineers involved in automotive plastics and coatings.

Our organization, which has been supporting businesses across all sectors for years through a wide range of testing, measurement, analysis, and evaluation activities, boasts a strong team of employees who closely follow global developments in science and technology and are constantly improving themselves. In this context, we also provide testing services in accordance with the "VW PV 3.10.7 Paints and varnishes - Testing for substances that impair the wettability of paint."