High temperatures can sharply reduc

High temperatures can sharply reduce the storage
stability of the raw materials. Care must be taken in
this respect particularly during long periods of
transportation and heating caused by solar radiation.
As a rule, the raw materials available on the
market are adequately stable over fairly short periods
of time (days to weeks) at temperatures up to
50 °C. This has to be the case as the temperature
of the raw material can often be 50 °C, for example
with tanker deliveries. A processing temperature of
20 to 25 °C is recommended in most cases, which
means that appropriate cooling, for example by
heat exchangers, should be arranged on receipt of
the raw materials. Temperature control of the raw
materials during prolonged storage is also appropriate.
High temperatures can impair the quality,
and low temperatures can impair the processability
by making the viscosity too high.
For completeness it should be noted that raw materials
containing blowing agents
(H-FC, H-CFC) should generally be stored at temperatures
below 30 °C.
As a general rule, the statutory regulations on storing
chemical raw materials should always be observed.