ISO 105-B06 Procedure 5: Automotive Interior Colorfastness and Aging Testing Explained

A seat fabric qualifies at initial submission. Color holds at specification. Eighteen months later, warranty claims start coming in for fading on door panel trim from the same material family. The fabric passed the test. The trim didn’t get tested the right way. The difference was the method.

ISO 105-B06 Procedure 5 is the xenon arc colorfastness standard for automotive interior textiles and organic substrates under elevated temperature and simulated window-glass-filtered sunlight. GPTesting runs Procedure 5 within its accredited xenon weathering scope under ISO/IEC 17025:2017 (A2LA Certificate No. 0079.01).

What ISO 105-B06 Procedure 5 actually tests

ISO 105-B06 is a xenon arc fading lamp test for colorfastness and aging of textiles and other organic substrates at elevated temperatures. It was designed specifically for materials that experience the combination of artificial daylight and heat inside a vehicle interior, where dashboard temperatures can reach above 80 degrees Celsius under solar load.

Automotive interiors incorporate many organic substrate types: woven and non-woven textiles, leather and leatherette, vinyl, carpet, foam-backed trim panels, and seat materials, all of which are subject to fading, discoloration, and surface degradation from extended in-vehicle sunlight and heat exposure. ISO 105-B06 provides the test framework that quantifies this degradation under accelerated, reproducible conditions.

Why Procedure 5 is the North American standard

ISO 105-B06 defines five exposure procedures, each using a different optical filter system and temperature condition to replicate different geographic and application environments.

Procedure 5 is based on SAE J2412 conditions, the established North American standard for accelerated exposure of automotive interior trim components. This alignment makes Procedure 5 the natural choice for suppliers to North American OEMs, where SAE J2412 has been the baseline interior weathering method since it replaced SAE J1885 in 2008. The other procedures, particularly Procedure 3 based on DIN 75202, are more widely referenced in European OEM programs. GPTesting runs Procedure 5 in its accredited scope.

How colorfastness is evaluated

Two measurement approaches are used after ISO 105-B06 Procedure 5 exposure.

The first compares the fading of exposed specimens to the ISO Blue Wool reference scale, a series of standard dyed fabrics with defined lightfastness levels. The rating indicates the specimen’s resistance relative to a known reference material.

The second uses instrumented colorimetry to measure Delta E, the numerical color difference between the exposed and unexposed specimen in CIELAB color space. A Delta E of 1 is roughly the threshold of human perception under controlled viewing conditions. A Delta E of 3 is clearly visible to most observers. OEMs set their tolerance limits to stay well inside what a customer would notice in a showroom, which is why Delta E values that look small on paper can still represent a qualification failure. Delta E provides a precise, quantitative measurement that can be directly compared to OEM specification limits. Both approaches are used in automotive qualification programs, with Delta E increasingly required for final submission data.

Which materials require Procedure 5 testing

ISO 105-B06 Procedure 5 applies to all kinds and forms of dyed and printed textiles and organic substrates. In automotive applications this includes seat fabrics and foams, door panel trim materials, headliner fabrics, carpet systems, instrument panel covers, and any coated or laminated interior surface where color retention is a specification requirement.

Testing is required at initial material qualification and whenever a colorant, dye, or treatment system changes. Even a change in colorant supplier or lot can shift lightfastness performance in ways that only xenon exposure testing will detect before production launch. The test is also relevant for materials that were qualified under an earlier specification revision and now need requalification.

GPTesting’s March Madness weathering promotion runs through April 6 and includes ISO 105-B06 Procedure 5 in the priority scheduling offer. Programs submitted before April 6 are prioritized for Q2 completion.

Request a quote for ISO 105-B06 Procedure 5 testing at gptesting.com

What is ISO 105-B06 Procedure 5 and how is it used in automotive qualification?

ISO 105-B06 Procedure 5 is a xenon arc fading lamp test for colorfastness and aging of automotive interior textiles and organic materials at elevated temperatures. It is based on SAE J2412 exposure conditions and is the procedure most widely referenced by North American OEMs for qualifying seat fabrics, door trim, carpet systems, and other interior materials. GPTesting runs Procedure 5 within its accredited xenon weathering scope under ISO/IEC 17025:2017 (A2LA Certificate No. 0079.01).

Is ISO 105-B06 Procedure 5 essentially the same test as SAE J2412?

ISO 105-B06 Procedure 5 uses exposure conditions based on SAE J2412, the North American standard for accelerated exposure of automotive interior trim components. Procedure 5 is therefore aligned with the SAE J2412 cycle profile, making it directly applicable to North American OEM qualification programs. The two are closely related but are distinct specifications, and the applicable one is defined in the OEM material specification.

My seat fabric spec references ISO 105-B06. Which procedure applies to North American programs?

ISO 105-B06 Procedure 5 is referenced in automotive OEM material specifications where colorfastness and aging of interior textiles and trim materials is required. North American OEM programs, particularly those requiring SAE J2412-aligned xenon exposure, frequently reference Procedure 5 for seat fabrics, carpet, and door panel trim. GMW14162 Method D, GM’s xenon weathering specification, is based on ISO 105-B06 exposure conditions.

How is colorfastness measured after ISO 105-B06 Procedure 5 exposure?

Colorfastness after Procedure 5 exposure is evaluated by comparing exposed specimens to the ISO Blue Wool reference scale (a qualitative rating of lightfastness) and by measuring Delta E, the numerical color difference between the exposed and unexposed specimen in CIELAB color space. Delta E is increasingly required for OEM submission data as it provides a precise, quantifiable result that can be directly compared to specification limits.

How long does ISO 105-B06 Procedure 5 testing take for automotive qualification?

Typical qualification exposures require 500 to 1,500 kJ/m². Including conditioning, post-exposure colorfastness and Delta E measurement, and reporting, most programs complete within 4 to 10 weeks from sample receipt. GPTesting’s March Madness weathering promotion through April 6 includes priority scheduling for programs submitted before the deadline.