Weiconlock AN 305-73 Flange Sealing Adhesive - 50ml Pen

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  • Low Strength Anaerobic Adhesive for sealing flanges, gearboxes and motor housings.
  • Allows easy disassembly of flanges when required.
  • High viscosity adhesive for accurate application to flange faces.
  • Anaerobic nature means that you can apply to the flange, but curing will not start until the two sides are mated (and adhesive is deprived of air).

Weiconlock AN 305-73 is a low strength, high viscosity flange sealing adhesive. Manufactured by Weicon in Germany, this professional-quality liquid gasket is used for sealing close-fitting flanges, gearboxes and motor housings.

In these applications, AN 305-73 can be a great alternative to conventional, cut gaskets. It’s often used in repair shops for this purpose as it cuts down on the amount of different sized gaskets that need to be kept in stock.

Weiconlock AN 305-73 Flange Sealing Adhesive can bridge gaps up to 0.3mm. Once cured, it will withstand temperatures between -60° and +150°C. This gasket adhesive is light green in colour.

Connections sealed with AN 305-73 will be able to be disassembled fairly easily which makes it ideal for sealing flanges that need to come apart for maintenance. This liquid gasket adhesive has excellent chemical resistance and can withstand attack from a wide range of fluids and media.

Typical Applications for Weiconlock AN 305-73

  • Sealing of close fitting flanges on gearboxes, pump housings, compressors.
  • Sealing lids and maintenance panels on electrical devices.
  • As an alternative to conventional gaskets on closely-mated metal-to-metal flange connections.


What do I do before using the adhesive?
Clean and dry as much as possible. Weiconlock grades will work on slightly oily surfaces but adhesion will be improved on parts that have been cleaned and degreased.

Do I apply the AN 305-73 to both flange faces or just the one?
Just the one. Do ensure that you make a complete bead though as any gaps will create potential leak paths once the flanges are joined.

What’s the shelf life of a container that’s been opened before?
There's no official data on this. Unopened containers of Weiconlock are expected to be good for at least two years (stored at room temperature). Opened containers appear to last at least that long (if not longer) in our own personal experience though we cannot warrant this in any way.

Do I need a primer?
Not for most material. With certain, passive, metals adhesion and cure time will be improved through the use of Weiconlock Activator.

Colour Light Green
Viscosity at 25ºC Brookfield 17,000 – 50,000 MPa
Gap Bridging Capacity (Max.) 0.3mm
Breakaway Strength (Thread) 6 – 10 Nm
Prevailing Strength (Thread) 2 – 5 Nm
Shear Strength (DIN 54452) 4 – 6 N/mm²
Handling Strength At
Room Temperature
20 – 40 Minutes
Final Strength At
Room Temperature
12 Hours
Temperature Resistance -60ºC to +150ºC


SKU SWP000246
Brand Weicon

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