3518 LAKESHORE ROAD
POST OFFICE BOX 758
PHONE 920-458-2121
FAX 920-458-1923
PLASTICS ENGINEERING COMPANY
SHEBOYGAN, WISCOSNIN 53082-0758
Injection Molding Guidelines for
PLENCO BMC Polyester Molding Compound

ParameterSuggested Press Settings
Mold Temperatures 143° - 171°C (290° - 340ºF)
Front Barrel Temperature
Rear Barrel Temperature
27° - 44°C (80° - 110°F)
27° - 44°C (80° - 110°F)
Stock Temperature 32° - 71°C (90° - 160°F)
Injection Time 3 - 6 Seconds
Clamp Tonnage27.6 - 41.4 MPa (2 - 3 Tons/in2) Of Projected Part Area
Screw Back Pressure 0.18 MPa (25 psi) or Less
Screw RPM 30 - 60 RPM

Additional Technical Information

Common Molding ProblemsPotential Solutions
Blistering Increase mold temperature
Increase stock temperature
Increase cure time
Gas BurnsSlow injection time
Check for blocked vent(s)
Lower stock temperature
Short PartsIncrease shot length
Increase back pressure
Lower mold temperature
Sticking PartsIncrease mold temperature
Increase cure time
Precure (set marks)Increase injection speed
Lower mold temperature
Lower stock temperature
The listed parameters are suggested for use as a guide when setting up an injection molding machine for molding Plenco Thermoset materials. These parameters are for your evaluation and may or may not be compatible for all mold designs, runner systems, press configurations, and material rheology. Please feel free to call Plenco and a Plenco Technical Service Representative will be happy to assist you. Revised 9-28-07
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Plastics Engineering Company
3518 Lakeshore Road, P.O. Box 758
Sheboygan, WI 53082-0758 U.S.A

Phone (920) 458-2121
Fax (920) 458-1923

Email Orders to orders@plenco.com