Kettlitz Chemie Kezadol GR

Kezadol GR is a soft 81.5 % calcium oxide granule coated with special dispersing agents, for use as a desiccant in rubber compounds which are cured on micro-wave systems, LCM or hot air. Moisture which is present in all rubber chemicals, especially fillers, will be absorbed and the calcium oxide will change to calcium hydroxide after reaction with the moisture. This reaction will happen while storing the uncured rubber compounds.

Functions: Desiccant

End Uses: Footwear, Housewares, Sporting Goods, Tires, Tubing

Technical Data Sheet
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Identification & Functionality

Plastics & Elastomers Functions
Technologies

Features & Benefits

Materials Features

Applications & Uses

Uses

Kezadol GR should be used in order to prevent blisters and porosity in the following rubber processes.-

  • Pressureless continuous curing systems like micro-wave, LCM, fluid beds or hot air
  • Low pressure curing in the cable industry
  • In compounds cured in heat transfer fluids
Dosage

The dosage of Kezadol GR (80 % CaO) depends on the moisture contained in the compound. The molecular weight of calcium oxide is 56, and 18 for water. By these relations it can be seen that for every part of water by weight expected in the rubber compound approx. 4 parts of Kezadol GR are required in order to avoid blisters on profiles. It is a standard practice to add quantities in excess of this amount, however, usually between 5 and 10 % calculated on the filler quantity. We recommend to add Kezadol GR in the second mixing stage. A big part of the humidity can escape in the first step at higher mixing temperatures without being absorbed by CaO. Kezadol GR can be added to the compound together with the special packing, if mixing temperatures of more than 85 °C are achieved (melting range of the PE foil 60–85 °C). Attention! AN OVERDOSAGE CAN CAUSE WHITE SPECKS

Properties

Physical Form
Appearance
light grey, soft granules (diameter 6–8 mm), free-flowing
Physical Properties
ValueUnitsTest Method / Conditions
Density at 20 °Capprox. 2.36g/cm³

Packaging & Availability

Packaging

hermetically sealed PE bags of low melting PE foil (60–85 °C) of 1 kg each in cartons of 15 kg each, stored on pallets with 960 kg net (standard). on customers’ request any measurement between 0.5 and 5 kg is possible.

Storage & Handling

Storage

1 year under cool and dry storage conditions in sealed packing