Renault D27 1911 Rubber and Plastic Paint Coatings - Artificial Aging Using Air Gauge

The “Renault D27 1911 Rubber and plastic paint coatings - Artificial aging using an air gauge” standard, developed by the French automobile company Renault, describes the conditions that must be followed to determine the resistance of a material to the effects of an artificial light source under specific wetting and temperature conditions. This method is an attempt to simulate the aging of materials when exposed to light and harsh weather conditions. This method is applicable to paint coatings and all other exterior parts made of rubber or plastic, fully colored, painted or unpainted. It is also applicable to sealants, tarpaulins and windows.

This testing method consists of subjecting one or more material samples to a cycle of sunlight simulation combined with a filtered xenon lamp and intermittent rain simulation. Damage is then assessed visually by comparison with an unexposed reference piece, or using colorimetric or other tests.

The Renault D27 1911 standard is a key specification in the automotive industry's quality assurance protocols, particularly for evaluating the durability of paint coatings applied to rubber and plastic components. The described test method focuses on simulating long-term environmental exposure through accelerated artificial aging in a controlled laboratory environment using a weather gauge. It ensures that coatings on flexible surfaces, common in modern vehicle interiors, exteriors, and seals, can withstand real-world degradation without cracking, fading, or losing adhesion.

The Renault D27 1911 standard targets coatings on non-rigid materials that are prone to unique types of failure due to substrate flexibility. The primary aim is to determine how these coatings will perform over years of service life by compressing natural wear, which typically occurs over months or years, into days or weeks. This is critical for automotive suppliers, as failures in rubber and plastic coatings can lead to aesthetic issues (e.g., chalking or discoloration) or functional problems (e.g., reduced sealing in air strips).

A weather meter (or weather-ometer) is an accelerated weather testing device that mimics outdoor conditions indoors. Popular models include xenon arc weather meters and QUV fluorescent UV testers. These devices expose samples to:

• Intense UV radiation (simulates sunlight)
• High humidity and condensation (dew simulation)
• temperature cycles
• Water spraying (rain simulation)

Xenon arc lamps are ideal for automotive coatings, providing the closest spectrum to natural sunlight. Testing shows that degradation is accelerated 10-100 times compared to outdoor exposure.

The described test method generally involves the following steps:

• Sample preparation: Coated rubber or plastic samples (e.g., EPDM gaskets, TPE bumpers) are prepared according to Renault specifications.
• Exposure cycle: Samples are placed in the weather meter chamber. Common parameters (compliant with ISO 4892-2 or SAE J2412 standards) include:
• Xenon arc light intensity: 0,55–1,5 W/m2 at 340 nm.
• Black panel temperature: 60-80 degrees
• Cycles: 102 minutes dry + 18 minutes water spray, with continuous humidity control.
• Total exposure: Typically 1.000-5.000 hours, depending on requirements.
• Assessment: Post-exposure samples are evaluated in terms of the following aspects:
• Color change (using a spectrophotometer)
• Brightness retention
• Cracking, blistering, or peeling
• Adhesion loss (cross-screening test)
• Chalking or fading

Passing criteria are defined in the standard and generally require minimal change after equivalent years of simulated exposure.

Rubber and plastic surfaces stretch, expand/contract with heat, which puts more stress on paint films than metal. Artificial aging introduces problems such as:

• Photodegradation: UV light breaks down binders, causing fading.
• Hydrolysis: Moisture causes swelling.
• Thermal stress: Heat accelerates yellowing in plastics.

This standard complements other standards such as Renault D47 1431 (filiform corrosion) or ISO 11341 (xenon arc test).

The Renault D27 1911 standard is mandatory for suppliers. In an era dominated by extended warranties and sustainable materials, such testing helps manufacturers create longer-lasting coatings, reduce recalls, and minimize environmental impact. This standard is a fully modern engineering protocol to improve vehicle reliability through rigorous materials science.

The Renault D27 1911 standard is considered important for the following reasons:

• Durability verification: Guarantees the long-term performance of the vehicle's exterior and interior components.
• Material comparison: Allows for the comparison of different coating formulations in terms of UV and heat resistance.
• Quality standardization: Renault mandates the application of the same test conditions throughout its supply chain, thus preventing performance variations caused by differences between manufacturers.
• Legal and warranty requirements: Reduces customer complaints such as discoloration or surface deterioration on external parts, which lowers warranty costs.
• Supplier approval: For a company supplying parts or materials to Renault, passing this test is a critical step in the material approval process.

In short, this standard is a crucial quality assurance standard used to ensure that automotive coatings are long-lasting, reliable, and aesthetically stable.

For many years, our organization, with its competent and experienced staff, has been understanding the needs of its customers, providing the advanced testing services they require, and assisting in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services to businesses in accordance with the "Renault D27 1911 Rubber and plastic paint coatings - Artificial aging using air gauges" standard.