Polyurethane Release Agents

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Our mold release agents for polyurethane provide a competitive advantage to the largest and smallest manufacturers alike. We offer water and solvent-based release agent solutions along with carrier-free solutions that can maximize productivity while meeting the most demanding specifications and operating conditions. We work with manufacturers on applications that include:

  • Integral skin
  • PU spray skin
  • High-resiliency foam for seating, acoustical, and carpet
  • Insulation back foaming
  • Visco-elastic polyurethane products
  • Rigid foams
  • Dual-density and single-density shoe soles
  • Isocyanate-bound products
  • Cast elastomers
  • Microcellular urethane applications such as jounce bumpers

Learn more about release agents here.

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Tutorial #5 – Polyurethane Application: Proper Spray Application

The video demonstrates how to properly apply a release agent to a mold prior to the startup of a polyurethane molding process.


Innovative Process Solutions for the Concrete and Stone Veneer Industry

At the core of our business are industry-standard mold release agents, download our Concrete and Stone products brochure to see how we solve de-molding problems in your industry.

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Delivering customized solutions for the toughest polyurethane molding challenges

For 50 years, Chem-Trend’s reputation has been built on a foundation of providing value and service. Download our Polyurethane product brochure to learn more about how we can solve your mold release problems.

Sure-Footed at all Molding Steps

Chem-Trend provides customized technologies to effectively optimize productivity for your shoe sole manufacturing processes.

Innovative Process Solutions for Shoe Sole Manufacturers

Find out how our mold release agents and ancillary process aids can help the manufacturing of polyurethane shoe soles. Download our brochure to find out more.

Are low or zero VOC release agents available in the market?

There are some concrete release agents that are low or zero VOC. This needs to be investigated when discussing the characteristics and attributes of different release agents with potential suppliers.

Are low/no VOC release agent and other process aid materials available to help meet emission regulations?

This is an area of growing concern and interest and there are products available that have low and zero VOC materials.

How are release agents best applied?

Depending on the production set up a wide variety of configurations can be utilized. From manual HVLP guns to automated spray systems, assistance with determining the best selection to efficiently apply concrete release agents should be provided by the release agent supplier.

How can concentrate release agents be most efficiently mixed?

Materials may be diluted through very reliable wall mounted or floor model proportioners. These units provide a consistent water to concentrate ration that allows for a dependable mix without the use of valuable manpower.

How can I ensure the surface is adequately sprayed?

By using a piece of cardboard a spray pattern may be tested. First make sure the spray equipment nozzle and air cap are clean and unrestricted. Hold the spray gun a distance from the cardboard that is a normal distance from the spray gun to the molding surface. Spray the mold release onto the cardboard in a sideways sweeping motion. The pattern should be solid yet dry quickly. Any splotches will show areas that may be under sprayed or unevenly applied. Liquid running down the surface means the liquid is being applied too heavily.

How do I ensure a consistent application from operator to operator?

When applying a release agent with manual spray it is important to establish a baseline throughput to maintain a consistent spray. Required throughput amounts will vary based on the tooling grain, part complexity, and the speed of the line. When a proper spray amount is determined the throughput in grams or milliliters per second should be recorded. This should be checked each shift to make sure there is consistency between operators. This information will help to train new operators to correctly apply the release agent. Consistent fluid and atomizing air pressures are also a must for repeatable application.

How long should I wait between when the release agent is applied and pouring polyurethane foam?

The key is to have a dry mold surface before the foam is poured. A liquid carrier is used to deliver the release agent to all surfaces of the tooling. This carrier should be evaporated before the foam is poured or injected into the tool.

What are the key factors in selecting a proper mold release for the task?

Key selection factors are:

  • Type of foam being produced (rigid, seating, RIM, etc.)
  • Molding temperature range
  • Mold material (aluminum, steel, etc.)
  • Time between mold release application and foam pour
  • Cure time
  • Foam density
  • Post molding requirements (bonding, painting, etc.)

The more information on the process the easier it is to determine the perfect release agent.

What are the major benefits of a release agent for concrete molding?

Obviously enabling the easy removal of cured parts from different molded materials is an important reason for using a release agent. What many do not consider is that these same materials can greatly increase mold life by maintaining a lubricious film on the mold surface that will prevent the cured concrete from deteriorating the interface. These products can also aid in the wetting out of pigments and improve color transfer from the mold substrate to the stone. This can help to minimize scrap caused by color changes. All of these benefits result in a more efficient operation.

What is a hybrid release agent?

Hybrid products provide the benefits of a solvent based material, such as an open surface and faster film formation and evaporation, but they utilize a waterborne carrier with a small amount of solvent to provide these benefits. This technology significantly minimizes VOC emissions.

What is the recommended spray equipment for release agents?

Various release agents can be used with many forms of spray equipment. While HVLP systems are the most common method of application, many other methods can be used based on equipment and plant configurations.

Will release agents affect the color of the stone?

Release agents for veneer/masonry stone applications and other specific concrete applications should be designed to allow pigments to wet out on the surface and to keep molds clean through improved color transfer. Maintaining a proper application amount and/or dilution is important in achieving these goals and the effectiveness of the release agent should be fully evaluated in a field trial prior to full scale adoption.

A brand of Freudenberg.
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