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High Temperature Polymers
High Temperature Materials

High temperature plastics are processed at melt temperatures ranging from 300 - 450°C (570 - 840°F). These materials present certain molding challenges due their unique processing characteristics. High mold temperatures require special hot runner systems, designed to deliver reliable performance under extreme conditions.

PSU (Polysulfon) molecule

Amorphous Materials
Amorphous thermoplastics such as PSU, PEI or PC are characterized by a high viscosity and a strong adhesion of the melt to the wall of the melt channel. Rheo-Pro® hot runner technology addresses this challenge specifically with special alloys and surface treatments that promote the flow of the melt.

High Temperature Plastic Materials
High temp PSU fittings


Crystalline Materials

Crystalline thermoplastics such as PEEK, PA4.6, LCP, and PPS are known for their distinct, sharp crystallite melting point.  This thermal characteristic demands extremely accurate temperature control of the hot runner along the entire melt channel, from the machine nozzle to the mold cavity.

High Temperature Valve Gating
New Rheo-Pro® iVG™ nozzles require no cooling or actuator maintenance over millions of molding cycles. iVG™ is the world's most compact back-to-back valve gate hot runner system and the first and only internal valve gate on the market. It is also the only air actuated valve gate hot runner that operates without seals.

Rheo-Pro® iVG internal valve gate nozzles are extremely compact and deliver accurate performance at high operating temperatures without cooling or piston wear (no o-rings)

iVG™ performs well under the most demanding processing conditions, unlike electric valve gates and conventional pneumatic cylinders, that can fail in extremely hot operating environments. iVG™ does not require any cooling, seals, hoses, tubes, belts or motors, making it the most durable and user friendly valve gate nozzle program ever built.


Learn more


Cooling-free Valve Gating
Black Box™ Valve Gate Actuators

iVG™ Internal Valve Gate Hot Runners
iVG™ Single Bushings

Molding Materials Guide PDF



Case Studies


Cooling and Maintenance Free Cylinders
New Rheo-Pro® Black Box™ pneumatic valve gate actuators perform even under the most extreme operating conditions by doing away with elastomeric seals, lubricants, and cooling. The new technology is ideal for all valve gate applications including high temperature and clean room applications.

New Black Box™ valve gate cylinders operate without elastomeric seals or lubricants, delivering continuous operation at temperatures of 450°C without cooling

Patented Heater Technology
Rheo-Pro® hot runner systems with patented heater technology offer ideal isothermal conditions for a uniform melt temperature and precision nozzle control.


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