GMI 60307 Heat and Cold Resistance Test of Automotive Interior Trim Materials

The “GMI 60307 Automotive Interior Trim Materials Heat and Cold Resistance Testing” standard, developed by General Motors International (GMI), is a materials testing standard related to evaluating the heat and cold resistance of automotive materials. This standard defines procedures to determine whether materials used in vehicle components can withstand extreme temperatures without unacceptable changes in appearance, mechanical properties, or functionality.

The GMI 60307 standard relates specifically to interior and upholstery materials where exposure to high and low temperatures during vehicle operation can affect durability, safety, and customer perception.

The primary purpose of the GMI 60307 standard is to verify that automotive materials maintain acceptable performance after being exposed to extreme temperatures. This test evaluates resistance to:

• Aging at high temperatures
• Exposure to low temperatures
• Thermal expansion and contraction effects
• Cracking, brittleness, deformation, or surface damage.
• Loss of adhesion between material layers
• Changes in appearance or dimensional stability

Automotive components are frequently exposed to temperature cycles, from the cold conditions of winter to the high solar load inside parked vehicles. A material that performs well at room temperature may degrade after repeated thermal stress.

The GMI 60307 standard is applicable to materials used in the following areas:

• instrument panels
• Door trim panels
• Center consoles
• Armrests
• Decorative interior pieces
• Plastic components
• Coated surfaces
• Laminated materials
• Textile-coated components
• Elastomeric parts

General Motors interior material standards typically require verification of the physical, environmental, and durability performance of interior components such as instrument panels, upholstery, floor coverings, seats, and consoles.

In principle, these tests involve preparing test specimens from the material or finished part, exposing the specimens to specified temperature conditions, examining the specimens after conditioning, and comparing the changes against acceptability requirements. Typical evaluation includes:

• Visual inspection: The following are checked:
  • Cracks
  • blistering
  • Impact
  • Surface imperfections
  • Color changes
  • Brightness changes
  • Peeling or detachment
• Physical assessment: Depending on the type of material, the following are checked:
  • Hardness changes
  • Loss of flexibility
  • Adhesion failure
  • Dimensional changes
  • Reduced mechanical strength

While the exact parameters depend on the material category and the relevant General Motors specification, heat/cold resistance testing typically includes the following:

• Heat exposure: Samples are exposed to high temperatures such as the following for a specified period of time:
  • 80 degrees
  • 90 degrees
  • 100 degrees or higher

The goal is to simulate the following:

• Working in a hot climate
• Solar heating inside parked vehicles
• Engine compartment heat transfer effects

• Minus 20 degrees
• Minus 30 degrees
• Minus 40 degrees

The evaluation determines whether the materials have reached the following condition:

• Fragility
• Cracking
• Permanent deformation
• Mechanical weakening

In the automotive industry, the GMI 60307 standard is considered important for the following reasons:

• Ensures long-term durability: Vehicle interiors must withstand temperature variations over many years. A dashboard material may be exposed to:
  • Very cold winter mornings
  • High summer cabin temperatures
  • Fast heating and cooling cycles.

This standard helps prevent potential premature failures.

• It prevents customer complaints: Temperature-related malfunctions can cause visible defects.
  • Cracked floor surfaces
  • Bent panels
  • Peeling decorative films
  • Loosely glued layers

These defects negatively impact the perceived quality of the vehicle.

• It supports material selection: the described test method allows General Motors engineers and suppliers to compare and select the most suitable materials for production.
  • Different polymers
  • Coating systems
  • Adhesives
  • Surface coatings
  • Textile structures
• It increases safety and reliability: Some malfunctions caused by extreme temperatures can affect:
  • Adhesion of internal components
  • Functional operation of the controls
  • Passenger contact surfaces

Thermal resistance testing reduces these risks.

The GMI 60307 standard is part of a broader General Motors materials qualification system. Relevant assessments may include:

• GMW 14444 Material-related internal component performance.
• GMW 16853 Comprehensive emissions test of interior materials and parts.
• GMW 14231 Interior Upholstery Fabrics
• GMW 14867 Performance requirements for paints on interior plastic surfaces.

In conclusion, the GMI 60307 standard is a crucial automotive material qualification standard for evaluating heat and cold resistance. This standard ensures that vehicle materials remain stable, attractive, and functional under challenging temperature conditions throughout the vehicle's lifespan.

For suppliers, compliance with the GMI 60307 standard demonstrates that their materials can withstand real-world environmental conditions and meet General Motors' durability expectations. Practically, the GMI 60307 standard answers a critical engineering question: will this material maintain its performance after years of extreme temperature variations?

For many years, our organization, with its competent and experienced team, has been understanding the needs of its clients, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services compliant with the GMI 60307 standard.