Weiconlock AN 305-72 Pipe & Flange Sealing Adhesive - 50ml Pen

SKU: SWM000086B01V0001
MPN: 30572150
Availability: Available for Fast Dispatch.
Container Size


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Buy 3 - 5 and pay only $28.46 each
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  • High Viscosity for Larger Gap Filling and Accurate Application.
  • Immediate Sealing Effect.
  • Enhanced with PTFE.
  • Medium Strength. Can Be Disassembled with Normal Tools.
  • German Hygiene Institut Approved for Potable Water.
  • DIN DVGW & AGA Approved for Use with Gas.

Weiconlock AN 305-72 Pipe and Flange Sealing Adhesive is a medium strength, high viscosity grade designed for sealing metal flanges, housings and connections as well as larger diameter pipes.

This grade of anaerobic adhesive is manufactured in Germany by Weicon and offers a variety of benefits. These are expanded on in the sections below:

Enhanced with PTFE for Greater Sealing.

Our Weiconlock AN 305-72 has its formula modified with PTFE to enhance the sealing effect offered. This ensures long lasting performance in a wide range of environments in which liquid gaskets are used.

Hygiene Institut Approved.

Our Weiconlock AN 305-72 has been tested and approved in by the Hygiene-Institut des Ruhrgebiets. This allows it to be used for bonding in drinking water applications.

AGA (Australian Gas Association) & DVGW Approval.

AN 305-72 has been tested and approved for use with Gas by the Australian Gas Association. It has has also been tested and approved in accordance with DIN DVGW.

High Viscosity.

Weiconlock AN 305-72 has a very high viscosity of 17.000 - 50.000 ht mPa·s (according to Brookfield at 25°C). This thick nature makes it a good choice for applying to complex flange shapes (such as compressor connections) or narrow flanges that require very accurate application.

Medium Strength, Can Be Disassembled when Needed.

Weiconlock AN 305-72 cures with medium strength for bonding and sealing connections that will likely need to be disassembled at some point in the future for servicing. Disassembly will be possible using normal tools. Strength ratings are summarised further below.

Weiconlock AN 305-72 Key Specs Overview.

Colour White
Threaded Joints Up To... M 80 / R 3“
Viscosity 17.000 - 50.000 ht mPa·s
Maximum Gap Bridging 0.4mm
Prevailing stregth 2 - 4 Nm
Handling Strength at Room Temperature 20 - 40 Minutes
Temperature Resistance -60°C to +150°C.

For more detailed information on this high-quality adhesive, please consult the specifications tab or the Technical Data Sheet via the Media Tab.

The Weiconlock Pen System.

One of the features of all Weiconlock Threadlockers, Flange Sealants, Retaining Adhesives and Pipe Sealers is the pen system they use for most size containers (300ml varieties are supplied in cartridges and are the one exception).

This special pen makes accurate application natural and easy. It also helps to reduce wastage as there’s less chance of spillage.

The Weicon Pen System has been used in all kinds of industries all over the world for decades and continues to be a key point of difference for these German-Made adhesives.

Common Features of All Weiconlock Anaerobic Adhesives.

WEICONLOCK® are one-component anaerobic adhesives and sealants, especially made for metal assembly parts.

The full range covers over 60 different grades designed for everything from Thread Locking, Pipe Sealing, Flange Sealing and Retaining Cylindrical Assemblies like bearings. There are special grades for potable water applications, gas lines, oxygen service and more.

No matter the grade chosen, all types of Weiconlock Adhesive have a few things in common:

Excellent Chemical Resistance.

All grades of Weiconlock Adhesives are resistant to a large variety of different chemicals, fluids and gases. Some of the more common are summarised in the table below. A more comprehensive list is also available via the Media Tab..

Media Resistance   Media Resistance
Acetic acid 80% o   Oxygen
Aromat, Solvent +   Phenol +
Brake fluid +   Propane +
Diesel, heating oil +   Seawater +
Edible oil +   Silicone oil +
Fuel oil +   Turpentine +
Glycocol, glycine +   Vinegar +
Helium +   Water (acidic) under PH 7 +
Hydrochloric acid +   Water PH 7 to 8 +
Isobutane +   Water (alk.) over PH 8 +
Kerosene +   Water, chlorinated +
Mineral oil +   Water, cooked o
Naphtha, petroleum +   Water, distilled +
Natural gas - dry +   Water, wastewater (sewage) +
Nitrogen gas +   Xylene, dimethylbenzene +

+ = Good Resistance.
o = Resistant
% = Limited Resistance.
- = Not Resistant.

Easy to Use.

In general, WEICONLOCK does not require special pre-treatment as slightly oily surfaces (e.g. on as received parts) will be tolerated.

However, best results will be achieved on cleaned, degreased parts (use WEICON Surface Cleaner). If required, the parts should be slightly roughened.

WEICONLOCK is ready for use and should be applied evenly direct from the bottle/tube with the dispensing tip (avoid direct contact of dispensing tip with metal). Apply continuous bead on one side of flange, join and tighten parts quickly.

For sealing applications (pipe fitting) apply WEICONLOCK in circular motions on the thread. Screw pipe threads together and tighten until desired orientation.

Do not pour back into the bottle any WEICONLOCK fluid which had contact with metal; even smallest metal particles will cause the content of the bottle to cure. In series construction, the use of manual or automatic applicators is recommended.

Simple to Store.

WEICONLOCK can be stored in the unopened original container for at least 24 months at room temperature. Keep away from heat sources and direct sunlight. The air in the bottle/tube keeps WEICONLOCK liquid.

Colour White
Viscosity 17.000 - 50.000 ht mPa·s
Maximum Gap Bridging 0.4mm
Breakaway strength (Thread)  7 - 10 Nm
Prevailing stregth 2 - 4 Nm
Shear strength Nmm² (DIN 54452)* 4 - 6 N/mm²
Handling Strength at Room Temperature 20 - 40 Minutes
Final strength (100%) after 5 - 10 Hours
Temperature Resistance -60°C to +150°C.

*Strength values based on M 10 screws, 8.8 grade, thickness of nut 0,8.d Static shear strength based on cylindrical parts of abt. Ø 13 mm, tolerance (D-d) = 0,05 mm, l/d = 0,88 

SKU SWM000086B01
Brand Weicon

What do I have to do to prepare the surfaces?

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.

Can is use Weiconlock AN 305-72 with plastic flanges?

Not by itself. As an anaerobic adhesive this grade relies on contact with metal and the absence of air to trigger curing. There is a workaround though. If you use Weiconlock Activator on the plastic parts first this will allow you to secure them with AN 305-72.

How long does it take to cure?

Full cure is expected to take about 5-10 hours at room temperature. The large range quoted here is a reflection of two things; the difference in what room temperature can mean and the fact that Weiconlock AN 302-72 will take slightly longer to cure on some surfaces than others.

All that being said, handling strength is achieved far faster. This will take about 20-40 minutes.

It is also important to remember that this grade seals immediately. Adhesive bonds will take time to develop but the sealing effect is immediate.

What’s its pot life?

Virtually unlimited. As an anaerobic adhesive, AN 305-72 only begins to cure when it is in contact with metal and deprived of air. That means as long as the bottle is open, no curing will occur.

It also means that great care should be taken to ensure that you don’t accidently allow any metal shards or filings to find their way into the bottle. Once the lid is back on, even the smallest amount of metal will cause the whole bottle to set.

How do I store it?

None of the Weiconlock grades needs to be kept in any kind of special storage. Just try and keep them somewhere that doesn’t get direct sunlight and away from heat sources. Room temperature is fine.