& Dispersing Agents | Rheological
Modifiers | Wood
|Dura supplies a range of organo metallic catalysts
These catalysts are used in accelerating the isocyanate / polypol reaction and the selection of one or more of the above catalysts depends on the formulation.
|Dura also offers an organo
tin based product DURASTAB
LT2 finds application as a catalyst for short polyurethane foams. A
catalyst combination of DURASTAB LT2 and DURASTAB LT3 Stannous Octoate is sometimes
used together with tertiary amines to avoid oxidative degradation.
LT-3 is a stannous salt of ethylhexanoic acid, also widely known
Recommended Storage conditions
storage stability of DURASTAB LT-3 is at least 12 months, provided it is
kept in the
during cold weather should not create any problems as DURASTAB LT-3
LT-3 acts an efficient catalyst for the gelling reaction during the
For this reason, the optimal use level depends on the formulation details, like reactivity of polyol, type of amine, type and amount of blowing agent and desired rise time.
catalysis out of balance are tight foam with bad porosity if the applied
amount of stannous octate is on the high side, and lots of tiny internal tissues
Base don 100 parts of polyol 0.17 - 0.40 parts per weight of DURASTAB LT-3 are commonly used levels. Special formulations for low-density methylene chloride blown foams can require up to 0.70 parts.
There are 2 ways to
feed the DURASTAB LT-3, either directly or to increase the accuracy,
premixed with some polyol, e.g., in a ratio of:10. Those premixes should
be used up quickly, preferably with the same day.
Chemical Corporation Ltd.