Polymer Compounds

LMI specializes in mixing custom rubber compounds, with intermeshing mixing lines that provide optimum dispersion for dense and sponge compounds.

LMI is committed to selecting the right materials based on your specific application and needs. Materials such as Ethylene Propylene Diene Monomer (EPDM) and Ethylene Propylene Rubber (EPR) have outstanding resistance to heat, ozone and weather. They show excellent resistance to hot and cold water, glycol, steam and polar chemicals like ketones and excellent electrical insulating properties.

EPDM and EPR show satisfactory compatibility with fireproof hydraulic fluids and alkalis.

Learn more on our Materials page

  • EPDM
  • Neoprene
  • NBR
  • SBR
  • Polybutadiene
  • Natural Rubber
  • CPE
  • CSM
  • AEM
  • FKM

*EPDM rubber is used in vibration dampening components, seals, glass-run channels, radiators, garden and appliance hoses, tubing, automotive and appliance seals, belts, electrical insulation. It is also used for roofing membranes, geomembranes, rubber mechanical goods and many other applications.


Black & Custom Color Compounds

  • Advanced color control
  • Custom color matching
  • UV Resistant compounds
  • Heat Resistant compounds

for Extrusion 

LMI offers a variety of both dense and sponge compounding options for the most sophisticated extrusion processes, including continuous sponge extrusion compounds.

compounds for molding applications

for Molding  

LMI offers options in both dense and cellular rubber for injection, compression and injection
molding processes.


Sponge Compounds 


LMI’s history and experience in the development and mixing of sponge compounds has made sponge one of our core product lines. Success in sponge requires excellent control over incoming raw materials, precise weighment of formulation additives and incredible control throughout the entire mixing process. LMI offers a wide array of sponge compound solutions for both continuous extrusion and molding processes.

Learn more in our Custom Rubber Mixing eBook.

Download eBook

Compound Design and Development 

LMI offers a wide range of compound design and development support. An experienced support team is ready to provide assistance in compound optimization and design for many technical applications. LMI has a fully-equipped lab mixer for creating small, prototype batches. Test compounds can also be evaluated on a pilot Liquid Cure Medium (LCM).