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Henkel has introduced Loctite SI 5930 FIT, an RTV silicone rubber adhesive for in-tire bonding applications.
Henkel has introduced Loctite SI 5930 FIT, an RTV silicone rubber adhesive for in-tire bonding applications.
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Henkel has introduced Loctite SI 5930 FIT, an RTV silicone rubber adhesive for in-tire bonding applications, to pave the road towards next-generation automotive tires with effective cavity noise reduction and increased sensor technology.

Loctite SI 5930 FIT (for Fix In Tire bonding of acoustic foam and sensors) is a one-component room temperature vulcanizing (RTV) silicone rubber adhesive supplied as thixotropic black paste with a tack-free time of ≤15 minutes, depending on ambient humidity.

The material offers excellent adhesion on all common tire rubbers used in the automotive industry, including mixtures for trucks and two-wheelers.

Likewise, extensive tests have confirmed the compatibility of Henkel’s Loctite product with different release agents typically used in tire production and with various special acoustic foams developed for enhanced cavity noise reduction.

Based on a proprietary adhesive technology proven in a wide range of plastic housing applications, Loctite SI 5930 FIT also provides the required bonding strength for in-tire mounted sensors. The result is a high-performance yet cost-efficient solution for an innovative new generation of low-noise intelligent summer, all-season and winter tires.

Fully cured, the Henkel adhesive offers a continuous operating temperature range of -50°C to +200°C, which is well above tire OEM standard specifications (120°C). Its outstanding bonding characteristics are complemented by excellent flexibility, with an elongation at break of ≥200 percent.

Moreover, Loctite SI 5930 FIT is an odorless product and free of methyl-ethyl-ketoximes (MEKO), which makes it a perfect choice for applications in line with more demanding health, safety and environmental standards (HSE).

Comprehensive support for rapid implementation

Several different brand tires with Loctite SI 5930 FIT bonded cavity noise reducing acoustic foam and integrated sensors are already on the road on various luxury vehicles. 

Some major automotive OEMs and Tier 1 tire manufacturers are now also targeting to phase-in the technology in the wider market of high-volume medium-size and compact cars, according to Wim Boone, Senior Sales Engineer for Henkel. 

As part of its extensive support package offered to tire manufacturers, Henkel is running a global in-tire bonding test program where customers can evaluate the processing and adhesion performance of Loctite SI 5930 FIT.

Apart from tensile shear and peel test procedures, this also includes a set-up for simulating extreme environmental conditions and temperature cycling up to 200°C in a climate chamber.

In addition, Henkel is actively collaborating with Pro-Sigma Consulting, an experienced tire market consultancy promoting silent tire bonding projects at OEMs and tire manufacturers worldwide, and with SEEB Automation (France), a leading manufacturer of tire wheel assembly equipment specializing in fully integrated solutions, including machines for automated in-tire foam bonding within a cycle time up to 12 seconds.

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