Polidiemme® G/420

coloring

• PE based masterbatches added at 0.6-1% (approx.) by weight; predrying of colour masterbatch is suggested if moisture absorption occurred during storage (4-6 hours at 70-80°C).

storage

• The product should be stored under the following conditions:

• closed and unbroken bags

• ambient temperature not exceeding 30°C

• avoid direct exposure to sunlight and weathering

• Product alterations could occur due to extended period of storage. Its use within six months from the production date is suggested.

• Solvay Padanaplast S.p.A. accepts no liability of any kind in case the above mentioned conditions are not fulfilled.

packaging

• 25 kg moisture-resistant bags on 1375 kg pallet.

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processing

• POLIDIEMME® G/420 pregrafted base must be added with Catalyst CT/1 masterbatch to promote curing. Catalyst dosage is 5% by weight and blending must be done just before using (2-3 hours max.), preferably in the extruder hopper. Catalyst doesn't need any predrying. The pregrafted base compound is sensible to moisture; open bags must be used within few hours.

extrusion equipment

• Standard PVC extruders and single or double flight screw, having a L/D ratio of 20÷30 and an adequate barrel thermoregulation; longer screws may require a reduced dosage of Catalyst.

• Screw cooling not required

• Filter net: 80-160 mesh/cm²

• Compression tools suggested

curing

• by immersion in hot water at 60-70°C

• by exposure to low pressure steam (about 0.15 bar)

• by exposure in ambient at 10-30°C for some days

• In all cases curing time depends on insulation thickness; for 0.7-1.2 mm wall thickness 2-4 hours are generally necessary in case of forced curing in hot water and 8-12 hours in case of curing in steam room; in case of self curing, time depends also on the specific ambient conditions.