Casting Tips

Painting Cast Urethane Parts Painting Cast Urethane Parts

Many modelmakers, prototypers and molders of polyurethane parts must paint cured plastic surfaces to attain a production-quality finish.  Some customers avoid painting by color-matching the more...

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Coloring Cast Urethane Parts Coloring Cast Urethane Parts

RAMPF provides a color-matching service for customers who purchase our polyurethanes.  (We do not offer this service for competitors’ products.)  However, before considering polyurethane pigmentation, more...

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Avoiding Air Bubbles in Cast Urethane Parts Avoiding Air Bubbles in Cast Urethane Parts

Trapped air in a mixed polyurethane resin system can produce bubbles in the surface or wall of a cast part.  To prevent the formation of more...

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Calculating Shrinkage in Cast Urethane Parts Calculating Shrinkage in Cast Urethane Parts

Before casting a urethane part, an accurate assessment of shrinkage is a key to obtaining dimensionally accurate results.  Shrink in urethane systems, and other thermoset more...

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Avoiding Moisture Contamination in Liquid Urethane Avoiding Moisture Contamination in Liquid Urethane

Polyurethanes are moisture sensitive materials.  Polymers that are exposed to moisture may form an indissolvable skin on the resin surface.  The skin can be removed more...

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UL 94 Test Standards for Flame Resistance UL 94 Test Standards for Flame Resistance

UL 94 Test Standards for Plastics RAMPFS’ product line includes flame-retardant polyurethanes that are specially formulated for use in manufacturing medical devices, electrical/electronic housings and more...

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Effects of Oxidation on Amine-Containing Materials Effects of Oxidation on Amine-Containing Materials

Among the highest performing elastomers in the RAMPF product line are polyurea/polyurethane hybrid systems that exhibit excellent durability with high strength, high heat resistance and more...

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Silicone Glove Molding Silicone Glove Molding

The low-pressure rotocasting process today is seeing a resurgence in popularity fostered, in part, by the development of improved process controls and easier-to-handle plastics. Moldmaking more...

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Ensuring Fully Cured, High Quality Cast Urethane Parts Ensuring Fully Cured, High Quality Cast Urethane Parts

Just as pilots perform a pre-flight check to verify that all systems are working properly, it is often helpful for molders of plastic parts to more...

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Choosing the Correct Casting Resin Choosing the Correct Casting Resin

With so many cast polyurethane systems available in the marketplace today, selecting the best material for a new prototype or part can be a most more...

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Quality Control Ensure Reliable Products Quality Control Ensure Reliable Products

At RAMPF, product quality and consistency is a top priority. As various products are manufactured, our quality control (QC) team conducts a variety of tests more...

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Check the Weather Report! Check the Weather Report!

When polyurethanes don't perform as expected, companies typically look for explanations such as technician error, mixing machine issues or supplier/raw materials problems.  A common culprit more...

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