Wevo launches WEVOSIL 20000 A/B silicone sealant for alkaline environments of AEM electrolysis cells and flow batteries

Product positioning: Targeting the sealing needs of alkaline electrolysis and energy storage equipment. According to Rubber World, WEVO-CHEMIE GmbH from Ostfildern Kemnat, Germany, has launched a silicone sealant called WEVOSIL 20000 A/B. The product is designed for use in alkaline environments and is intended for AEM electrolysis cells and flow batteries. The original text was published in the form of a text message, without providing specific parameters such as curing mechanism, hardness, tensile strength, and performance retention after alkali immersion, nor did it indicate whether it has passed any industry certification.

Known facts and information boundaries

• Product name: WEVOSIL 20000 A/B, two-component (A/B) packaging form.

  . Supplier: WEVO-CHEMIE GmbH, located in Ostfildern Kemnat, Germany.

• Material category: Silicone sealant.

. Target environment: alkaline environment. Target applications: AEM (Anion Exchange Membrane) electrolysis cells, flow batteries.

The above information comes from the source text. Other than the formula composition, vulcanization conditions, bonding substrate, temperature resistance range, and service life data, they do not appear in the source and will not be supplemented in this article.

Significance for the Rubber and Tire Industry

From a material perspective, this product belongs to the application extension of silicone sealing materials in electrochemical devices, and has technical similarities with commonly used rubber seals, hoses, and molded products in the tire industry: both require long-term elasticity and sealing force in specific media.. The alkaline environment has a significant impact on the aging of most elastomers, involving the selection of anti-aging agents and the influence of vulcanization systems on the stability of cross-linked networks. The silicone system itself has good heat resistance, but its long-term stability under strong alkaline conditions still requires specific test data support. The source did not provide such data. In terms of formula design, although sealant and tire rubber belong to different categories, they both face issues with filling and reinforcement. White carbon black, as a reinforcing filler in tire formulations, can improve the mechanical properties and rolling resistance of the rubber compound. Similarly, the sealant system also needs to adjust the modulus, thixotropy, and medium resistance through the filler system. WEVOSIL 20000 A/B did not disclose its filler composition, so it cannot be determined whether there is a technical connection between it and the white carbon black reinforcement system. For tire and rubber product companies, it is worth noting that the demand for elastomeric seals in electrochemical energy storage and hydrogen production equipment is forming a segmented market. This type of application requires sealing materials to have alkali resistance, electrolyte resistance, low precipitation, and long-term compression permanent deformation, which can be borrowed from the testing experience of rubber aging and weather resistance in the tire industry. If there are any third-party alkali aging data released in the future, it can serve as a reference case for evaluating the lifespan of elastomers in alkaline media.

Observations

The product currently has limited public information. It is recommended to pay attention to its curing method (heating or room temperature), adhesion performance to metals and engineering plastics, swelling and hardness changes in alkaline electrolytes, and whether it has the low ion precipitation characteristics commonly used in electrochemical devices.

. These indicators will determine whether it can truly enter the bulk supply chain of AEM electrolysis cells and flow batteries.

Information source:New silicone sealant from Wevo for AEM electrolysers and flow batteries， Organized by Herun Chemical.