56 PET Plus User Manual
9.3 CHIP SIzE
For optimum drying the chip size should be approximately 1mm diameter, i.e. an average chip weight
of 20mg.
Larger granules, i.e. 40 mg and above, should be ground to powder in the polymer chip grinder then
the SUPPLIED PET (POWDER) procedure followed.
9.4 DRYING PRINCIPLE
Weigh out 3.8g of polymer chip and transfer to a sample drying tube (glass phial).
Dry the chip samples under vacuum at 150ºC overnight, (optimum drying time is 16 - 24 hours).
The above values are guidelines based on the experience of many users. Adjustment of temperature
and drying time may be required to get the best and most repeatable results.
9.5 DRYING PROCEDURE
Using a suitable container and laboratory balance, weigh out 3.8g of polymer chip. Pour the sample
into a sample drying tube (glass phial) then screw the cap onto the top of the tube. Tighten the cap
sufficiently to give a good seal between the silicone rubber gland and the glass tubing but do not over
tighten.
Repeat for the other phials as required noting
that a maximum of 6 samples can be dried at a
time.
Set the temperature controller on the Polymer
Drier to 150ºC, switch the drier on and wait for
15 minutes for the drier to reach this temperature
and stabilise.
Start the vacuum pump by pressing the Vacuum
Power switch on the front of the polymer drier.
Shown: Temperature control
Shown: Vacuum power switchl
