DIN 75220: Common Uses and Requirements for Solar Simulation Testing
DIN 75220 testing setup for evaluating automotive material fire resistanceIn the automotive interior environment, materials endure one of the most severe and complex weathering conditions encountered in any consumer product application. Dashboard surfaces, seat materials, door trim panels, and headliners face intense solar radiation, extreme temperature cycling from cold overnight storage to greenhouse-hot interior temperatures, and long-term exposure to UV-A and visible light — all simultaneously. DIN 75220 is the German standard governing the ageing of automotive parts and materials under solar simulation conditions, providing a reproducible, accelerated laboratory test environment that replicates the damaging effects of natural automotive interior exposure. In the automotive & chemical industry, DIN 75220 testing is a cornerstone of interior material qualification programs.
Understanding DIN 75220
DIN 75220 — “Ageing of Automotive Parts in Solar Simulation Units” — specifies the test conditions, exposure equipment, and specimen preparation requirements for simulated solar radiation ageing of automotive interior components and raw materials. The standard is published by the German Institute for Standardization (Deutsches Institut für Normung) and is widely referenced by German and European automotive OEMs and their global supply chains.
Solar Simulation Conditions
DIN 75220 specifies:
- Irradiance: 1,000 W/m² total solar irradiance at the specimen surface, simulating intense summer sunlight
- Spectrum: Solar simulation lamps (typically xenon arc with appropriate optical filters) reproduce the UV and visible spectrum of natural sunlight reaching the Earth’s surface
- Black standard temperature: Typically 105°C at the specimen surface — replicating the temperature of dark-colored dashboard surfaces in parked vehicles under intense solar loading
- Air temperature inside the chamber: Controlled, typically 50–60°C
- Humidity: Defined relative humidity conditions during exposure
Test durations of 40, 80, 120, 160, or 200 hours are specified, with duration selection based on the vehicle zone, exposure severity, and OEM specification requirements.
Applications of DIN 75220 Testing
Dashboard and Instrument Panel Materials
Polypropylene, PVC, TPO, and ABS-based dashboard materials are among the most extensively DIN 75220-tested materials in the automotive & chemical industry. These surfaces face maximum solar radiation and thermal loading — black dashboard surfaces can reach 120–130°C in parked vehicles in summer. DIN 75220 evaluation checks for:
- Discoloration and color shift (ΔE* measurement per CIE Lab*)
- Chalking and surface degradation — loss of surface gloss and chalk formation
- Cracking and crazing — surface fracture from photo-oxidation embrittlement
- Tackiness — migration of plasticizers to the surface causing stickiness
- Dimensional distortion — warping from differential thermal expansion
Seat Cover Materials and Foams
Leather, vinyl-coated textiles, woven and nonwoven fabrics, and polyurethane foam used in automotive seating are subjected to DIN 75220 ageing to evaluate color fastness, fabric degradation, foam surface oxidation, and loss of material flexibility. Seat materials in windshield-exposed areas of convertibles and open vehicles face particularly severe solar loading.
Trim and Decorative Elements
Wood grain appliqués, chrome-look plastic trim, metallic films, and decorative inserts on door panels and center consoles are evaluated under DIN 75220 to verify that decorative appearance is maintained throughout vehicle service life — typically defined as 10–15 years of owner use.
Adhesives, Sealants, and Bonding Materials
Structural adhesives and decorative bonding materials used in automotive interior assembly are aged per DIN 75220 to verify that bond strength and flexibility are maintained under solar thermal loading — preventing delamination of trim elements during vehicle service.
Plastics and Polymer Compounds
Raw material qualification programs for automotive interior polymer compounds routinely include DIN 75220 ageing as part of the approval process. Polymer suppliers must demonstrate that their materials maintain color, gloss, and mechanical properties within OEM-specified tolerances after defined DIN 75220 exposure durations before material approval is granted.
DIN 75220 in Context: Related Standards
ISO 105-B06 and AATCC 16 — Colorfastness to Light
For textile components specifically, colorfastness to xenon arc light (ISO 105-B06, AATCC 16) parallels DIN 75220 solar simulation but focuses on color change evaluation using the Blue Wool scale — the textile industry’s reference framework for light fastness rating.
SAE J2412 and J2527 — US Automotive Solar Simulation
SAE J2412 (interior) and J2527 (exterior) are the primary North American automotive solar simulation standards — specifying xenon arc exposure conditions with different filter sets, irradiance levels, and evaluation intervals than DIN 75220. Global vehicle programs often require compliance with both DIN 75220 and SAE J2412/J2527 to satisfy European and North American OEM requirements simultaneously.
BMW PR 303 and VW PV 3929
Major German OEMs publish proprietary specifications that reference and extend DIN 75220 — specifying material-specific acceptance criteria (maximum ΔE*, minimum gloss retention, no cracking) for each interior zone and material type. Supplier qualification requires compliance with both the base DIN 75220 test conditions and the OEM’s acceptance requirements.
DIN 75220 is a critical automotive testing standard that simulates the combined effects of solar radiation, elevated temperature, and humidity on vehicle interior and exterior components within a controlled laboratory environment. By replicating the thermal and photochemical stresses produced by prolonged sun exposure, it enables manufacturers and suppliers to evaluate material degradation, color stability, mechanical property retention, and outgassing behavior before components reach production. As a cornerstone of automotive material qualification across OEM supply chains globally, DIN 75220 testing provides the accelerated aging data necessary to validate material selections, support design approvals, and ensure that interior and exterior components meet durability and safety expectations throughout the vehicle service life.
Why Choose Infinita Lab for DIN 75220?
Infinita Lab provides DIN 75220 solar simulation ageing testing for automotive interior materials — including polymer compounds, textiles, leather, adhesives, decorative trim, and complete component assemblies — supporting automotive & chemical industry suppliers and OEM qualification programs with precise irradiance control, black standard temperature monitoring, and comprehensive post-exposure evaluation including color measurement, gloss, flexibility, and surface quality assessment. Our automotive materials testing team provides guidance on test condition selection, OEM-specific acceptance criteria, and combined ageing program design. Visit infinitalab.com to discuss your DIN 75220 testing requirements with Infinita Lab’s automotive testing specialists.
Frequently Asked Questions
What is DIN 75220 and what does it test? DIN 75220 is a German automotive standard that defines procedures for aging vehicle components under simulated solar radiation, elevated temperature, and controlled humidity conditions to evaluate material degradation and performance retention over accelerated exposure periods.
Which automotive components are typically tested under DIN 75220? Dashboard assemblies, door trims, seat materials, headliners, carpets, sealing profiles, exterior trim, painted surfaces, adhesives, and polymeric components exposed to sunlight within or on the vehicle are commonly subjected to DIN 75220 solar simulation testing.
How is color change assessed after DIN 75220 testing? Color measurements are taken before and after exposure using a spectrophotometer referenced to CIE Lab* color space. Delta E values quantify total color change, and results are compared against OEM-defined acceptance limits for the specific component and material type.
How are outgassing and VOC emissions evaluated in relation to DIN 75220? Solar aging under DIN 75220 conditions accelerates polymer degradation and plasticizer migration, increasing VOC and fogging emissions from interior components. Post-exposure outgassing testing per DIN 75201 or VDA 278 quantifies changes in volatile emissions resulting from accelerated solar aging.
How does component geometry influence DIN 75220 test setup and results? Three-dimensional components such as dashboard assemblies and door panels experience non-uniform irradiance distribution across their surfaces. Test setup must account for component orientation, shadowing effects, and fixture design to ensure representative exposure and meaningful comparison with field degradation patterns.
