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Weicon Chocking Backing Compound

Weicon Chocking Backing Compound (often referred to more simply as Weicon CBC) is a specially designed epoxy resin system used for the shimming and back filling of difficult to align systems and surfaces. It serves as a replacement for fittings and worn metal sheets while ensuring direct contact with any foundation plates. Weicon CBC will bear heavy loads and due to the very low shrinkage that occurs with this product, machinery and equipment remain constant in their orientation after casting with Weicon Chocking Backing Compound.

Weicon CBC has a low viscosity which allows it to be poured when required and has very good adhesion to steel. In addition, CBC has good compressive strength and is resistant to oils, fuels and many chemicals whilst also withstanding long term exposure to temperatures up to 160°C (once cured).

Key Features
  • Vibration Resistant
  • Impact Resistant
  • Long Lasting
  • Liquid and Self Levelling
  • Easy to Apply to Irregular Surfaces and Cavities
  • Long Pot Life of 30 Minutes
  • Chemical Resistant
  • Resistant to Fracturing, Breaking and Ageing
  • Almost Zero Shrinkage
Applications for Chocking Backing Compound

Chocking Backing Compound is usually used for the mounting or securing of machinery or equipment in areas where direct placement on existing surfaces is not possible. Examples include the mounting of…

  • Electric Motors
  • Gears
  • Stabilisers
  • Flaps
  • Masts
  • Antennae
  • Winches
  • Linkages
  • Crane Rails
  • Pumps
  • And many, many more.
Technical Characteristics
Property Value
Composition Epoxy Resin
Aluminium Filled
Colour (After Curing) Grey
Mixing Ration by Weight (%)
Resin / Hardener
100 : 30
Pot Life at 20°C
10kg Preparation
30 Min.
Density of the Mixture 1.5g/cm³
Viscosity of the Mixture (at 25°C) 45,000 mPas
Cure Time for
Mechanical Loads
12 Hours
Final Hardness 24 Hours
Mean Compressive Strength
acc. DIN EN ISO 604
70 MPa
Elongation at Break
DIN EN ISO 527
0.7%
Impact Strength
ISO 179-1/1eU
3.7 kJ/m²
Mean Strength E-Modul
DIN EN ISO 527
4,170 MPa
Shore D Hardness
DIN EN ISO 868/3s
80
Shrinkage 0.02%
Temperature Resistance -40°C to +160°C
Available Sizes

Weicon Chocking Backing Compound is available from Associated Gaskets in 3kg and 10kg kits.

Processing and Application

The following is a summary of the full instructions for proper application of Weicon CBC (located on the Technical Data Sheet). It is strongly suggested that you refer to this document when actually using the product (in addition to the two Safety Data Sheets).

Preparation

Before using Weicon Chocking Backing Compound it is very important to ensure that the surface(s) to which it will be applied are clean, dry and free of grease. The same applies to the tools and mixing containers being used. Adhesion can be improved by mechanical roughening, particularly when applying CBC to very smooth surfaces.

The resin component of Weicon CBC should be pre-heated to about 25°C (if stored below this). The casing area must be dammed with a suitable material and prepared for casting. Suitable materials for this include foam rubber strips, steels strips, sealing putty combined with a release agent).

You will also need a drill and a stainless steel spiral stirrer. A hot air gun may also be used to accelerate curing if desired.

Mixing

Before adding the hardener, the resin must be stirred carefully and without creating bubbles. Once done, the hardener should be added and the two components should be stirred for at least 4 minutes (without forming bubbles) using a mechanical stirrer set to low speed (300 – 1000 t/min).

To help avoid the formation of bubbles, make sure the drill is turned off when put in and pulled out of the resin container. Only mix as much of the product as you will use within the pot life while strictly following the mixing ratio.

Pot Life

The listed pot life (30 minutes) refers to 10kg at 20°C. When mixing a larger amount, the material will cure faster and thus, the pot life will be shorter. Ideally, processing should take place at room temperature (20°C). Higher temperatures shorten the pot life.

Casting

Apply the mixed Chocking Backing Compound immediately. To avoid bubbles, pour as close to the surface as possible.

Curing and Machining

Weicon CBC will be completely cured after about 24 hours (at 20°C). Curing time can be shortened by applying heat from approximately 1-2 hours after the resin has solidified.

Storage

Weicon CBC should be stored in a dry place at room temperature. Unopened containers have a minimum shelf life of at least 24 months.






 
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