GME 60341 Test Method for Determining the Seam Strength of Flooring Edge Materials

The “GME 60341 Test Method for Determining Seam Strength of Upholstery Edge Materials” standard, developed by General Motors Europe (GME), is an automotive test specification designed to determine the seam strength of upholstery materials used specifically in vehicle seat covers and interior soft upholstery.

The primary purpose of this standard is to evaluate the ability of seams in flooring materials to withstand mechanical loads. The test is primarily applied to:

• Automotive seat cover fabrics
• Textile upholstery materials
• Synthetic leather (depending on application requirements)
• Laminated or coated flooring materials
• Other stitched interior trim components

This standard specifies the maximum force required to break or separate a weld under tensile loading.

A car seat cover is subjected to repeated forces in the following situations:

• Passenger entry and exit
• Passenger movement during driving
• Seat adjustment procedures
• Prolonged vibration and fatigue loading

Therefore, seam performance is a critical factor in ensuring durability and passenger safety.

In principle, a prepared sample containing a suture is subjected to tensile force until the suture breaks. This test generally evaluates the following:

• Suture breaking strength
• Suture dehiscence behavior
• Suture rupture
• Tear of fabric next to the seam
• Thread breakage
• Sewing shift

The measured result indicates the floor structure's ability to maintain its integrity under service conditions.

The typical test procedure essentially follows these steps:

• Sample preparation: Samples are cut from the flooring material with the seam positioned according to the required orientation. Key parameters include:
  • Material orientation (warp/weft or machine orientation)
  • Seam
  • Stitch type
  • Yarn properties
  • Seam allowance
• Conditioning: Prior to testing, samples are typically conditioned under controlled laboratory conditions to stabilize the following:
  • Temperature
  • Gender
  • Material moisture content

This is important because textile strength can vary significantly depending on environmental conditions.

• Tensile loading: The specimen is mounted on a tensile testing machine and pulled until it fractures. The applied load is usually recorded in Newtons (N).
• The type of fracture is documented. For example,
  • stitch thread breakage
  • Removing the stitches
  • Fabric tearing
  • Opening stitches

Typical parameters evaluated in these tests include:

• Seam strength: The maximum force a seam can withstand.
• Seam strength: The ability of seams to remain strong.
• Thread performance: The resistance of sewing thread to breakage.
• Fabric strength near the seam: Preventing tearing next to the seam.
• Suture elongation: Deformation before rupture.

The GME 60341 standard is considered important for the following reasons:

• Passenger safety: Seat covers are constantly subjected to mechanical stress. Weak stitching can lead to:
  • Seat cover tearing
  • Loss of sight
  • Exposure of internal foam structures
  • Reduced collision protection performance in extreme situations.

This standard helps ensure that the upholstery maintains its structural integrity throughout the vehicle's lifespan.

• Quality control for suppliers: Automotive suppliers use this test to verify the following:
  • Consistency of the stitching process.
  • Material compatibility
  • Yarn selection
  • Production quality

A material may have excellent tensile strength, but still fail due to poor seam design.

• Durability and customer satisfaction: Visible seam defects are among the most noticeable interior imperfections. Testing according to this standard helps prevent the following:
  • Broken stitches
  • suture separation
  • Wrinkles resulting from suture deformation.
  • Early seat cover replacement

The GME 60341 standard is typically used in the following situations:

• Material approval
• Seat cover development
• Supplier qualification
• Prototype verification
• Production Part Approval Processes (PPAP)

This standard is especially important for:

• Seat cushions
• Seat back covers
• Door panel trims
• Armrest covers
• Interior textile upholstery

The GME 60341 standard is typically part of a broader internal material verification program that includes the following tests:

• Seam strength: The resistance of welded joints.
• Tear resistance: Resistance to fabric tearing.
• Wear resistance: The ability to withstand wear and tear.
• Color fastness: Appearance preservation.
• Flammability test: Fire safety.
• Aging tests: Long-term performance.

In conclusion, the GME 60341 standard is a crucial standard used in automotive interior durability testing, measuring the strength and reliability of seams in upholstery materials. By verifying the seams' resistance to mechanical loads, this standard helps automotive manufacturers and suppliers ensure that seats and interior upholstery remain safe, durable, and visually acceptable throughout the vehicle's lifespan.

For automotive seat suppliers, compliance with the GME 60341 standard is a key indicator of material quality, stitching process control, and long-term interior performance.

For many years, our organization, with its competent and experienced staff, 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 GME 60341 standard.