Processing

POLYPROPYLENE requires adjustments to the processing used for Polyethylene

Oven Temperature – Actual air in oven	300^oC	280^oC to 315^oC	570^oF	540^oF to 600^oF
PIAT	225^oC	220^oC to 235^oC	440^oF	435^oF to 445^oF
Mold External Surface Temperature	245^oC	240^oC to 260^oC	475^oF	465^oF to 500^oF
Rotation	Similar to LMDPE.
Oven Time	About 10% more than LMDPE – 1 minute per 0.25 mm (.01 inch) of wall thickness.
Cooling	Delay airflow onto mold for about 5 minutes after removing from oven. Then fan-air cool.
Demoud	Crystallizes at about 125^oC (255^oF). Can be removed at anywhere below 115^oC (240^oF). Care should be taken when handling hot materials and products (refer to MSDS). Optimisation of the molded part will take up to 72 hours after demolding, due to continued crystalisation.
Shrinkage	About 1.5% (1.5% to 2.5%) or 1% less than LMDPE.
Supervents	Are known to improve processing and product appearance. http://laplastecnica.co.nz/products/

For processing information refer;

1/. POLYPROPYLENE-Rotational molding processing guide.

2/. Trouble shooting guidelines

Important

The information contained on this website is of a general nature only and is intended to provide an indication of the potential properties and benefits of a particular polypropylene compound. The statistical and other information provided on this website has been determined in laboratory test conditions. Accordingly, there may be differences in performance in a production environment including having regard to the materials used.

The information contained in this website should not be used as a sole basis for production or manufacturing purposes. Independent testing verification and independent professional advice should be obtained before making a decision to use any product or to apply any method or process.

To the full extent permitted by law, PSD Rotoworx Pty Limited (ACN 166 016 244) (“PSD Rotoworx”),/ Salee Colour PLC, and their related entities, their directors and employees: (i) give no warranty or representation that the information contained in this document is accurate and complete in every particular, and (ii) disclaim all liability for reliance on the information contained in this document.