WEICON WEICONLOCK AN 305-10 Anaerobic Flange Sealant

WEICON WEICONLOCK AN 305-10 Anaerobic Flange Sealant is an anaerobic industrial adhesive solution developed to provide permanent sealing together with high-strength bonding on metal flange surfaces and suitable connections. Its orange color and fluorescent traceability help make application control easier. The high-viscosity structure supports forming a uniform sealing bead, especially on complex flange geometries. With proper surface preparation and correct tightening, it is designed to help keep maintenance intervals stable.

Flange sealing structure and working principle of AN 305-10

This product functions as an anaerobic, resin-based industrial adhesive that cures in narrow metal gaps once contact with air is cut off. By creating a sealing line between flange surfaces, it aims to close leak paths while also bonding the joint. The high-viscosity range helps the material stay in place without running and spread as a continuous bead where it is applied. The manufacturer is WEICON GmbH & Co. KG and the origin is Germany.

Performance features and strength parameters

AN 305-10 contributes to tolerance management with a maximum gap-bridging capability of up to 0.5 mm on flange surfaces. Shear strength is stated as 5–10 N/mm² according to DIN 54452, and it is positioned in the high-strength class. Initial handling strength typically develops within 15–30 minutes, and full strength is expected to develop within 6–12 hours. Since the temperature resistance is given as -60 °C to +200 °C, it supports a reliable sealing approach in lines where process temperatures vary.

Standards, approvals, and process compatibility

The product is specified as a BAM-tested flange sealing solution and includes a referenced compliance information under AGA AS 4623-2008. Such approvals can be a selection criterion, especially in facilities with gas line equipment and flange connections. Its orange and fluorescent nature can contribute to application traceability in maintenance and quality control processes. Due to its high-strength character, removability planning should be evaluated based on process requirements in maintenance scenarios where disassembly is needed.

Application method, surface preparation, and areas of use

Before application, the surfaces to be sealed should be cleaned of oil, dirt, and loose oxides, and a clean, dry substrate should be prepared. Without letting the nozzle contact metal directly, the product should be applied as a continuous bead to one side of the flange, and the parts should be assembled and tightened quickly. If used for sealing pipe connections, applying it to the thread in circular movements and tightening until the desired orientation is achieved is recommended. Not returning product that has contacted metal back into the container is a critical practice to reduce the risk of premature curing inside the package.

Industry applications and key advantages

This industrial-adhesive-based flange sealant can be considered for points requiring sealing in gas lines, flange connections, valves and fittings, and process-line joints. In machine manufacturing, it helps reduce leak risk in metal-surface connections such as gearbox housings, pump flanges, and compressor flanges. High viscosity improves application control and makes it easier to form a continuous sealing line on flange surfaces. Its wide temperature resistance is a major advantage for targeting long-term performance under demanding process conditions. For storage, it is stated that the product can remain stable for at least 24 months at room temperature in its unopened original packaging and should be protected from heat sources and direct sunlight.