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Polyester Acceleration

COMACC Accelerators are either single-metal or multi-metal metallic soaps based on synthetic monocarboxylic and naphtenic acids depending on the application. They are supplied in liquid form and are stable, highly soluble and carefully controlled to ensure that product quality comply with corresponding specification data sheets. COMACC Accelerators can be supplied in various metal concentrations or combinations thereof and solvents depending on customers' requirements.

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Cobalt is used to accelerate the curing of unsaturated polyester resins and may be used on its own or in conjunction with other metals like Potassium, Sodium and Copper to obtain optimal results. COMACC Cobalt accelerators can be supplied at various concentrations and solvents according to customers\\\' needs.

Product / Grade Metal Content  Appearance  Colour  Solids Content  Specific Gravity (at 25°C)  Viscosity (at 25°C) Application information  SDS
 %m/m %m/m  mPas 
Cobalt Octoate 12% White spirits 11.7 - 12.3 Clear Liquid Violet 65 -75 0.95 - 1.05 800 max Primary Drier in alkyd resin paints & Polyester accelerators  pdf-icon
Cobalt Octoate 10% White Spirits 9.7-10.3 Clear Liquid Violet 50 - 58 0.92 - 0.99 400 max Polyester accelerators  pdf-icon
Cobalt Octoate 8% White Spirits 7.8 - 8.2 Clear Liquid Violet 42 - 46 0.87 - 0.93 100 max Printing Ink Driers and Polyester accelerators  pdf-icon
Cobalt Octoate 6% White Spirits 5.7 - 6.3 Clear Liquid Violet 28 - 38 0.84 -0.94 80 max Polyester accelerators  pdf-icon

COMACC Potassium

In certain applications Potassium can be used to enhance the effectivity of Cobalt and offers the advantage of a lighter coloured cured polyester resin.

Product / Grade Metal Content Appearance Colour Solids Content Specific Gravity (at 25°C) Viscosity (at 25°C) Application information
%m/m %m/m mPas
Potassium Octoate 15% White Spirits 14.7 - 15.3 Clear Liquid Gardner 12 max. 68 - 75 0.96 - 1.05 1000 max Polyester accelerators
Potassium Octoate 10% White Spirits 9.7 - 10.3 Clear Liquid Gardner 8 max. 45 - 50 0.90 - 0.98 700 max Polyester accelerators


Comar has developed a new Sodium Accelerator, that replaces the traditional Potassium Accelerator, which is used in the curing of Unsaturated Polyester Resins. The advantage of Sodium over Potassium is that its use will lead to lighter coloured cured resins, while providing all the functions of Potassium in conjunction with Cobalt.


Copper is used to retard the cure of unsaturated polyester systems and is known to lower the peak of the exotherm in certain formulations.


This product is a cobalt feeder, and is used in conjunction with standard Cobalt Accelerators. Its function is to maintain the activity of the cobalt accelerator of a period of time.