A Perfect Solution to Cover Liquid Surfaces and Tanks such as:

  • Wastewater
  • Biomass
  • Ponds
  • Slurry lagoon
  • Dangerous materials
  • Heated or cooled open surface tanks


The simplest and most effective way to control:

  • Fumes and smell
  • Heat loss
  • Evaporation loss
  • Chemical loss
  • Oxygen absorption
  • Odour
  • Light penetration
  • Organic growths
  • UV effect


Features and Benefits of Using Croffles:

  • “Install and forget” solution – maintenance free
  • Resistant to storms and wind
  • Reusable
  • Life expectancy of 10 years
  • No running cost
  • Not affected by rain, snow and frost
  • Quick and simple to install
  • Spread automatically as the liquid levels rise and fall


Quality Polypropylene Croffles: Effective Plastic Float Balls

Our polypropylene croffles and floating ball blankets provide a highly effective solution to difficult liquid storage problems. By placing a sufficient number of hollow plastic float balls onto the surface of a liquid, they arrange themselves into a closely packed formation over 91% of the surface area. Therefore, such a high surface coverage provides a successful barrier. As a result, this reduces the mass and heat transfer mechanisms operating between the liquid and the surrounding environment.

Also, a thermal insulation barrier is achieved through the air held in each plastic float ball and the poor heat conductivity of plastic. Although the air pockets between the croffles are not sealed, this contributes to this cellular insulation system which dramatically reduces heat loss.

In addition, the low liquid surface area exposed to the atmosphere decreases liquid loss through evaporation, odour released into the atmosphere and prevents surface absorption of oxygen.

Most importantly, a blanket of our float balls presents no difficulty to product dipping or equipment which need to move through the liquid; when this occurs, the balls are pushed aside, but quickly reform their cover as the equipment moves forward or products are lifted away from the tank. The balls will also rise and fall with the liquid level, which provides a constant cover over liquids held in reservoirs with sloping sides or within storage tanks. Moreover, if the liquid level falls, causing the surface area to shrink, the balls will stack in a double layer; as the level rises again they will spread themselves into a single layer.

Material Specification and Chemical Resistance


High-Density Polyethylene (HDPE)

High-Density Polyethylene (HDPE) – suitable for working conditions up to 80°C (176°F). HDPE is recommended for all external applications due to its enhanced resistance to freezing conditions.



Polypropylene (PP)

Polypropylene (PP) – able to withstand continuous working temperatures of up to 110°C (230°F). Suitable for contact with most chemicals used in the metal treatment industry.



Ultra Violet (UV)

Ultra Violet (UV) – stabilising additives prevent the degrading effects of sunlight. HDPE is also recommended for demineralised water and Chromic acid applications.




PVDF – This material offers increases in operating temperatures up to 160°C (320°F) providing resistance to many aggressive chemicals where alternative plastics would fall.


In conclusion, Polypropylene croffles are an effective solution to solve your liquid storage issues. After that, if you want to find out more you can contact us at or take a look at our range of Croffles on our shop.


Floating Croffles – The Advantages:

  • Wide range in size: from 6,5mm till 150mm.
  • Surface coverage of up to 90%.
  • Heating costs reduced by up to 75%.
  • Reduction of liquid loss through evaporation by up to 90%.
  • Minimized chemical consumption.
  • Improved working environments.
  • Increased life expectancy of building structures by reducing corrosive vapours.
  • Lessened demand on air extract systems, saving factory heating and reducing gas scrubber demands.
  • Foul odours reaching the atmosphere are reduced.
  • Allows movement of equipment through the liquid.
  • Decreased penetration of UV rays.
  • Precludes growth of algae and clogging weeds.
  • Lowered ice formation point by up to 50°F (10°C), in freezing conditions.
  • Extra stability at wind speeds above 147 km/h (28 m/s).
10mm blue croffle cover balls