VW TL 52320 Flexible Sound Insulation Film - Material Requirements

The “ VW TL 52320 Flexible sound insulation film - Material requirements” standard, developed by the Volkswagen automotive company , describes the requirements for materials used in heavy coverings such as sound insulation, especially when combined with non-woven fabric and foam, and when combined with heavy sheet carpet.

The basic requirements in this standard are stated as follows:

• Initial supply and approval of changes according to VW 01155 standard.
• Avoidance of hazardous substances according to VW 91101 standard.
• 2,5 m2 of material is required for full testing.

Before testing, samples must be conditioned for at least 48 hours in an atmosphere of 23 degrees Celsius and 50 percent relative humidity according to the VW 50554 standard.

When evaluating measurement results, the required numerical values ​​​​are valid for each measurement.

The material properties are specified as follows:

• Defined formulation for indicating recycling information.
• The production and composition of the materials used for the released part must be disclosed. If recycled materials are used, their amount must be limited to 30 percent by weight.
• Only materials specific to the manufacturer's internal processes are allowed to be used as recycled material.
• In the context of part/material development, a procedure that ensures the environmental behavior of the part is tested during production must be validated and documented (e.g., comparing oxidation induction time, specifying a formulation free of recycled content, or deferring delivery until proof is provided). Proof that aging resistance has been verified during the production process is part of the release.

Material and property requirements should be taken from the tables provided in the standard.

The soundproofing film must maintain its dimensional stability and functional capacity in the temperature range of -25°C to +95°C, at 55°C and 95% relative humidity. The backside of the film must be constructed to provide a uniform and durable adhesive bond with textile nonwovens or polyurethane (PUR) foam.

The sample size in terms of mass per unit area is 50 x 100 mm2. Additionally, flexural stiffness should be tested in accordance with the table given in this standard and the VW PV 3903 standard. Tensile strength should be tested in accordance with the DIN 53504 standard.

In short, the VW TL 52320 standard is a technical delivery specification covering the requirements for damping or sound-insulating panels, which are frequently used inside vehicle bodies to reduce noise, improve cabin acoustics, and control vibration. This standard covers damping panels (typically flexible films or foils) used to reduce vibratory acoustic noise in vehicle cabins or body panels. The aim of this standard is to ensure that such materials provide consistent performance in the following areas:

• Sound absorption / insulation
• Vibration damping
• Mechanical flexibility and adhesion
• Durability under thermal and environmental stresses

The general scope of this standard is:

• Material composition and layer structure
• Mass per unit area
• Acoustic and vibration damping performance
• Mechanical tests (e.g. flexibility, tensile strength)
• Environmental durability (temperature cycling, exposure to humidity)
• Adhesion and compatibility with substrates
• Aging and thermal stability tests

The VW TL 52320 standard, a technical standard produced by the Volkswagen Group that defines the requirements for sound insulation films used in vehicles, is considered important for the following reasons:

• Ensures acoustic performance: The purpose of this standard is to specify the required properties for materials used to reduce airborne and structure-borne noise in vehicles. Materials that do not meet this standard may not provide adequate noise reduction, resulting in reduced cabin comfort and perceived vehicle quality.
• Defines material requirements: This standard outlines:
  • Mechanical flexibility
  • Thermal stability
  • Age resistance
  • Adhesion to sub-surfaces
  • Sound absorption and insulation performance

This ensures that materials perform reliably over time and under automotive environmental conditions (e.g., temperature fluctuations, humidity, vibrations).

• Original equipment manufacturers This is critical for approval: OEMs such as Volkswagen, Audi, or Porsche use such standards to qualify suppliers. Materials not certified to VW TL 52320 may be rejected for use in vehicle production or interior trim assembly.
• Supports standardization and supply chain efficiency: By complying with the VW TL 52320 standard, suppliers can:
  • Ensuring interchangeability of materials.
  • Simplifying quality control.
  • Helping original equipment manufacturers reduce validation and testing time for new parts.
• Safety and durability: Some acoustic films also serve secondary functions, such as vibration damping or mild flame resistance. This standard ensures that the product will not deteriorate or pose a risk over time.

Consequently, the VW TL 52320 standard is important because it ensures that flexible sound insulation films used in vehicles:

• Meeting stringent acoustic, mechanical and durability criteria.
• Being safe, long-lasting and original equipment manufacturer approved.
• Providing a quiet and high-quality driving experience.

As a result, the VW TL 52320 standard is Volkswagen's official specification for materials used as damping or sound insulation boards, and compliance is mandatory for suppliers supplying insulation films in Volkswagen Group vehicles.

Our organization, which has been serving for many years and meticulously following global developments in science and technology, employs a skilled team and extensive infrastructure to conduct testing, measurement, and analysis in a wide range of areas for businesses across all sectors. In this context, we also provide testing services in accordance with the "VW TL 52320 Flexible Sound Insulation Film - Material Requirements" standard.