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Rubber molded part

Many Rubber Applications,
One Molding Expert

The rubber molding process has been around for hundreds of years and today it is utilized to generate thousands of different products that come in a wide array of shapes and configurations:

Gaskets and seals for transportation, machinery and durable goods applications:

  • Rotary shaft seals
  • O-rings
  • Dust seals
  • Wash tub seals
  • Heat exchanger gaskets

Medical equipment and supplies:

  • Syringe cups
  • Blood vial stoppers

Sporting goods:

  • Golf ball cores and covers
  • Soles and mid-soles for athletic shoes

Noise Vibration and Harshness (NVH) elimination/reduction (Anti-vibration mountings):

  • Motor mounts
  • Suspension mounts
  • Machinery isolation

General rubber goods:

  • Shaped tubes and hoses
  • Stoppers and grommets

Chem-Trend has been involved in making mold release agents and associated molding processing aids for manufacturers of these types of goods for several decades. In the late 70s we started to develop value adding semi-permanent release agents to help rubber molders improve their efficiency, reduce their scrap and reduce their downtime. In 1991, we expanded our capabilities by acquiring the Perma-Mold® line of products, a well-respected brand of conventional release agents. That acquisition, along with our many years of experience in semi-permanent products, allowed us to provide our customers with a wide range of technologies and expertise to address the challenges of the rubber molding industry.

Meeting the Challenges of Rubber Molding

Today, Chem-Trend is a global leader in providing release agents and related molding process aids for use in a wide range of rubber molding applications. The processes of compression, transfer, injection and injection-transfer molding all have certain characteristics that challenge release agents. Each application of these processes dictates major performance attributes that the mold release agent must possess. These “must-have” attributes for the release agent may not be of equal relevance for each application. However, not giving the issue reasonable consideration could easily result in inefficiencies, high scrap rates, poor product quality and potential damage to molds or a complete production stoppage due to stuck parts. For example:

  • Anti-vibration mountings: when these parts are made from a rubber-to-metal bonded construction, it is extremely important that the release agent does not transfer from the mold to the molded part in any appreciable amount. If excessive transfer happens, the bond line could be compromised and the component would need to be scrapped. The mold release agent must also impart a high degree of chemical resistance in order to prevent the mold surface from being contaminated with adhesive residues and by-products of off-gassing – which can also result in the part needing to be scrapped. Beyond these requirements, the mold release agent must also release the product cleanly and efficiently from the mold.
  • Wash-tub seals: when molding these parts the transfer of mold release agent to molding is not a critical issue. However, the molded profile is often very complicated, meaning that the mold release agent must provide a high degree of slip so that the seal can be easily extracted from the mold. The amount of slip that is built into the mold release formulation ensures that the extraction force is very low, limiting the chance of tearing the rubber profile.
  • Rotary shaft lip seals: these products are molded to form very thin rubber sections, which need to retain their definition as close to the mold profile as possible. A correctly designed conventional release agent at the right dilution can spread into difficult-to-reach areas of the mold profile and produce a very well-defined part that can be easily extracted from the mold tool. This needs to be achieved without causing such defects as splits or knit lines in the rubber section.
    Knit line defect in rubber molded part

Based on our extensive production floor experience, working shoulder-to-shoulder with our rubber molding customers for decades, Chem-Trend is able to understand and differentiate the needs of your process. Factors such as compound type and hardness; production parameters such as molding temperature, molding process, mold shape/construction, rubber to substrate bonding; and post-molding requirements all factor into finding the right product.

A Worldwide Support Network

When you purchase Chem-Trend products for your rubber molding operations you get more than world leading products, you also gain access to a worldwide network of industry professionals committed to overcoming your particular molding challenges. We utilize our direct production floor experience working with customers, combined with our molding know-how, to address your specific production challenges. We bring this to you through our sales, technical service and distribution experts who are available locally to our customers from a global network of offices.

Our main Research and Development Center is reinforced by technical service and development laboratories around the globe. Our laboratory facilities house equipment that allows us to simulate our customers’ processes during the product development phase, thus enabling us to evaluate performance and quality before our products reach you. It’s all part of our commitment to providing our customers with greater value, performance and dependability. When you choose Chem-Trend you’re choosing world tested products that are ready to solve your unique challenges.

We have vast experience in developing a wide variety of semi-permanent and conventional mold release agents for rubber molding processes, as well as mold protectors. Contact us and let us prove to you that our process aids can increase your efficiency and lower the costs of your rubber molding operations.