VOC Emissions · Fogging · Formaldehyde · Salt Spray · Thermal and Environmental Simulation

ISO/IEC 17025 Accredited Testing Where Applicable | VDA 278 and ISO 12219 Capability | Automotive Materials Specialist

The materials used in automotive manufacturing are tested long before they reach the assembly line. A seat foam must be assessed for VOC emissions before interior approval. A door trim panel must pass fogging testing before OEM specification. A coated bracket must survive salt spray before underbody clearance.

This guide covers the principal materials testing disciplines, the standards that govern them, and how they connect to the supplier qualification process.

What Automotive Materials Testing Covers

Automotive materials testing spans chemical emissions, corrosion and environmental simulation, and regulatory substance compliance, covering interior trim polymers, adhesives, foams, textiles, coatings, fasteners, and EV powertrain materials.

Testing requirements are defined by the OEM material specification, the supplier quality agreement, or both. Re-testing is required whenever formulation, source, or OEM specification changes. Qualification is not a one-time event.

VOC Emissions Testing, VDA 278 and ISO 12219

Volatile organic compound (VOC) emissions from automotive interior materials are subject to strict OEM limits.

The vehicle interior is a confined space where emissions from multiple materials accumulate, and qualification requires each material to meet defined limits before production approval.

VDA 278: Thermal Desorption GC-MS

VDA 278 is the primary standard for VOC and FOG (semi-volatile) analysis of automotive interior non-metallic materials. Required by German OEMs including BMW, Volkswagen Group, Mercedes-Benz, and Audi, and widely adopted across global Tier-1 supply chains.

The method heats a small material sample in two stages: 90°C for the VOC fraction and 120°C for the FOG fraction. Compounds are identified and quantified by GC-MS and reported in micrograms per gram, broken down by chemical class. Pass or fail is assessed against OEM-specified limits per compound, per compound group, or for total VOC.

ISO 12219: Component-Level Chamber Testing

ISO 12219 is the international standard series for VOC measurement in vehicle interiors. Parts 2 through 7 cover component-level emissions testing from individual materials, which is the relevant scope for material suppliers. ISO 12219-1 covers vehicle cabin air at the type approval level and does not apply to material qualification. If your specification references ISO 12219, confirm which part and test conditions apply before submitting samples. 

VDA 275: Formaldehyde Determination

Formaldehyde receives dedicated attention in most German OEM specifications, with limits typically tighter than the general aldehyde group limits in VDA 278. VDA 275 uses a bottle method: sample sealed with distilled water at 60°C for three hours, with formaldehyde measured by photometric analysis. Results in micrograms per gram. ALS can run VDA 275 and VDA 278 from a single sample submission. 

ISO 6452: Fogging Testing

Fogging is the deposition of condensable vapours from interior materials onto the vehicle windscreen. ISO 6452 defines gravimetric and photometric assessment methods. Fogging testing is typically required alongside VOC testing as part of a complete interior material qualification submission. 

Common Reasons for VOC Test Failure

• Residual processing solvents: adhesives, coatings, and laminates not fully cured or dried before testing will release solvent compounds that may exceed VOC limits.
• Plasticiser migration: PVC-based and plasticised polymers release high-boiling compounds in the FOG fraction at the 120°C stage.
• Formaldehyde from binder resins: a recurring issue in headliners, floor carpets, and foam materials using formaldehyde-based binder chemistry.
• Amine compounds from polyurethane foam: indicate incomplete urethane reaction chemistry, affected by catalyst selection and curing conditions.
• Background contamination: conditioning in a non-clean or VOC-contaminated environment can elevate results independent of the material itself.

Corrosion and Environmental Testing

Automotive materials testing includes corrosion and environmental performance testing for metal components, coatings, and surface treatments alongside VOC emissions requirements.

Salt Spray Testing: ISO 9227 and ASTM B117

ISO 9227 covers three salt spray atmospheres: NSS, AASS, and CASS. ASTM B117 is the American equivalent for neutral salt spray. The standard, atmosphere, duration, and acceptance criteria are always defined by the OEM specification and should not be assumed from general practice.

Thermal and Environmental Simulation

The IEC 60068 series covers the principal environmental simulation tests for automotive materials and electronics: IEC 60068-2-14 for thermal shock, IEC 60068-2-78 for damp heat, and IEC 60068-2-1 and 2-2 for cold and dry heat cycling.

Damp heat testing is particularly relevant for components destined for Malaysia and Southeast Asia, where sustained high humidity is a normal operating condition.

Materials Testing for EV Components

As EV production scales across Southeast Asia, materials testing requirements are expanding beyond conventional powertrain applications. Key testing areas for EV-specific materials include

• Battery thermal management components: chemical emissions and thermal stability under operating temperature ranges
• High-voltage cable insulation: electrical properties under humidity exposure and thermal cycling
• Power electronics assemblies: environmental durability to IEC 60068 and chemical compatibility with cooling fluids
• Battery system materials: off-gassing assessment under thermal stress conditions

Frequently Asked Questions

What is the difference between VDA 278 and ISO 12219 for VOC testing?

VDA 278 uses thermal desorption GC-MS and is required by German OEMs. ISO 12219 covers both vehicle-level cabin air testing and component-level emissions testing. For material qualification, the component-level parts of ISO 12219 apply. Both frameworks may apply if your supply chain includes German and international OEM relationships.

Can ALS test for VDA 278 and VDA 275 from the same sample?

Yes. Both tests can be conducted from a single sample submission, minimising the material required and simplifying the submission process. Confirm both requirements when making your enquiry.

Does interior air quality testing mean the same as VOC testing?

Not exactly. VOC testing measures emissions from a specific material sample under laboratory conditions. Interior air quality refers to cumulative VOC concentration in a vehicle cabin, assessed at the vehicle level by the OEM. As a material supplier, the requirement is component-level VOC emission testing, not whole-vehicle cabin air quality measurement.

How should I prepare samples for VDA 278 testing?

Condition samples at 23°C and 50% relative humidity for seven days in a clean environment. Sample size is typically one to three grams. Seal in clean, VOC-free packaging immediately after manufacture.

What to Prepare Before Submitting

Before submitting samples, confirm the material specification and acceptance limits, the standard or standards required, sample quantity available and whether conditioning has been completed, and the OEM reporting template if one is specified.

Automotive Materials Testing at ALS

ALS Testing provides automotive materials testing across VOC emissions, fogging, formaldehyde, salt spray, and thermal and environmental simulation for suppliers in Malaysia and Southeast Asia. ISO/IEC 17025 accredited testing is available where covered by our accredited scope.

Next Steps

• See our full Materials and Environmental Testing services
• Read our detailed VOC Testing guide
• Back to Automotive Testing
• Contact our team for a materials testing quotation or technical discussion: https://www.alstesting.co.th/contact-us/  

ISO/IEC 17025 Accredited Testing Where Applicable | VDA 278, ISO 9227 and IEC 60068 Capability | Serving Malaysia and Southeast Asia