The standard "BMW GS 95008-3 Wiring harness components in motor vehicles - Adhesive tapes for wiring harnesses in motor vehicles - Requirements, tests," developed by BMW, a multinational vehicle manufacturer, specifies the requirements and test methods for adhesive tapes used in vehicle wiring harnesses. This standard applies only to new designs and is used only for initial approval/registration by original equipment manufacturers. The resulting data may be used if additional approvals are obtained for applications. The adhesive tapes in series production have not been modified.
Tapes are primarily used for bundling and binding cables or bundles of cables. In special cases, additional requirements may be imposed on adhesive tapes, such as insulation, securing cables or bundles, protection against mechanical damage, chemical agents, or sound-absorbing properties. The scope of application (including relevant tests for initial releases) depends on the installation location, the resulting requirements, and any additional special requirements.
Adhesive tapes are applied at room temperature. Proper adhesion requires that the wiring harnesses used for wrapping be free of oil, grease, silicone, talcum powder, or other substances that could reduce adhesiveness. Because applied adhesives are pressure-sensitive, brief, firm pressure, especially on the tape end, is essential. The adhesive tape manufacturer's storage and handling instructions should be followed.
The following temperature classes are defined in this standard:
The scope of testing is determined by the adhesive tape supplier and the automotive manufacturers' engineering departments. In the standard case, the test criteria matrix applies. Test results are also binding for adhesive tapes of the same structure with different geometric dimensions (length, width, finished versions).
The adhesive tape supplier is obligated to deliver a series of materials that meet the tested and approved product quality. In the event of any relevant product changes, the automaker's design departments must be notified in advance, and approval must be obtained before delivery (after testing, if necessary).
Adhesive tapes generally consist of a carrier material (substrate) and a single- or double-sided adhesive layer. Adhesive tapes can be backed with a single- or double-sided silicone film or paper backing. Adhesive tapes are available as rolls or pre-drilled pieces.
The test report must specify the adhesive tape construction in terms of substance classes and materials for each component: substrate, e.g. fabric, fleece, foil, adhesive, coating, weight of individual components.
Unless another test climate is specified, tests and conditioning are carried out in the ambient climate according to DIN 50014. Any other conditions must be stated in the test report.
The sampling procedure is based on DIN EN 1939. The sample roll is conditioned under test climatic conditions for at least 24 hours. The outer three wraps of the adhesive tape roll are rejected. The sample strips are then cut. All tests are performed on 19 mm wide tapes. Additional tests for smaller tapes are only performed upon request. For each test, samples that are not older than 6 months at the beginning of the test and have not been used in previous tests are used.
In the high-stakes world of automotive engineering, where every decibel counts for passenger comfort and vehicle quality, BMW has long been a pioneer in setting rigorous standards. The BMW GS 95008-3 standard includes a precise method for measuring noise reduction in adhesive tapes used to wrap wiring harnesses and other long items in vehicles. This standard has influenced global automotive suppliers, leading to quieter cabins and more durable wiring systems.
Automotive wiring harnesses are essential but problematic. As vehicles travel over rough roads, these wiring harnesses rub against each other, chassis components, or protective wrapping, producing high-frequency squeaks and rattles. While traditional materials like PVC adhesive tapes provide insulation and bonding, they have failed to reduce noise, often amplifying rather than dampening vibrations.
Textile-based adhesive tapes include woven or nonwoven fabrics coated with pressure-sensitive adhesives. These woven tapes offer better flexibility and abrasion resistance, but their noise performance varies greatly. BMW has designed the BMW GS 95008-3 standard to measure and improve this.
The BMW GS 95008-3 standard defines a controlled noise measurement protocol to evaluate the sound reduction performance of adhesive tape. The test setup simulates real-world conditions. A cable bundle is wrapped with the tape and subjected to oscillatory friction against a fixed surface, typically at frequencies and amplitudes reflecting road-induced vibrations.
The key elements of this standard are:
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