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Technical Data
Chemical Resistance of Plastics
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High Density Polyethylene (HDPE)

Suitable for working conditions up to 176°F (80°C). HDPE is recommended for all external applications due to its enhanced resistance to freezing conditions. Black, UV stabilizing additives prevent the degrading effects of sunlight. HDPE is also recommended for demineralized water and Chromic acid applications.

Polypropylene (PP)

Able to withstand continuous working temperatures of up to 230°F 110°C. Suitable for contact with most chemicals used in the metal treatment industry.

Polyvinylidene Fluoride/Polyvinylidene Difluoride (PVDF)

This material offers significant increases in operating temperatures up to 320°F (160°C), providing resistance to many aggressive chemicals where other plastics would fail.

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Floating Ball Cover Diameter and Surface Coverage

The percentage of area covered by the floating ball cover is independent of the ball diameter, being the ratio of a circle to the hexagon which surrounds it. This equates to 91% of the liquid surface area. The frictional contact points ensure that each floating ball cover remains stable when subjected t44o increased liquid or air turbulence.

Average weight (g)Number per ft²Number per m²

Floating Ball Cover Diameter and Surface Coverage


Open Surface1 Layer 38mm Balls2 Layers 38mm Balls
Avg Surface Temperature °C907050907050907050
Energy consumption Kwh/h10.734.611.612.701.31.602.040.760.051
Percentage energy saving757165817670
Evaporation liters/m²h13.054.971.451.670.410.141.280.380.13
Percentage vaporation saving879190909291