Composite Release Agents

Synthetic Composite Release Agents

Industry Overview

Composites are made from two or more materials with significantly different physical or chemical properties that combine to form a new material with its own unique capabilities. The individual components of a composite generally remain separate and distinct within the new material. Advancements in composite technology have exponentially grown in tandem with the plastic and polyurethane industry over the last seventy years, but composites are far from a modern concept.


The earliest known composite material, the wattle and daub, was a wood-reinforced clay fabricated as early as 6,000 years ago and it is still used today. Plywood and concrete are also composite building materials that predate modern engineering. Ancient Egyptians and Mesopotamians created stronger boat hulls, pottery, and brick with inlaid straw fibers and the Mongolian bone-wood composite bow was the most feared weapon in the world until the advent of firearms in the 14th century. While the wattle and daub and other natural composites continued as staple building materials, many natural composites saw a decline in daily usage and weaponry with advancements in metallurgical technology. The next leap forward in composite technology occurred hundreds of years later with the advent of polymers and the need for lighter materials.


The first synthetic composites were invented in the early 1900’s but did not see much use until radio detection and ranging (RADAR) technology called for durable, lightweight material with excellent electromagnetic properties. After World War II, fiber-reinforced polymers and ceramic composites began to replace metal in the aerospace industry and by the turn of the century the automotive market had become the largest consumer of composite materials.


The cost of developing and manufacturing synthetic composites was not an obstacle during the Cold War. As more consumer products are made with synthetic composites, however, cost reduction has become a crucial element in driving composite innovation. McLube Composite Release Agents will significantly reduce the manufacturing and operating costs of composite molders and producers. Continue reading to learn more about our proven release agents for synthetic composites or contact us for process assistance and free samples.

Benefits of McLube Composite Release Agents


Composite Release Agents are designed to enhance flow during curing steps and never transfer to the molded part. Reduced transfer will improve part appearance and cut down on prep time for painting and gluing (if applicable). All McLube Release Agents contain proprietary rust-inhibiting additives to extend the lifespan of molds and tooling. Our products for composite release are thermally stable to 1,000°F and chemically inert; they will not interfere with material integration. We offer operator-friendly and environmentally-conscious release agents that help customers meet governmental regulations and plant safety goals.

Reduced scrap and rejection rates - McLube release agents are tailormade for specific materials and processes and will achieve far superior release characteristics than generalized coatings. Superior release characteristics translate to reduced rejection rates and scrap to save time and valuable raw materials.

Efficiency - our products are non-dusting, non-oily and will not buildup on the mold surface, allowing customers to run their molds longer. We also offer dual mold sealers and release agents that eliminate the need for an extra sealing step.

Extending tooling life - our products will protect mold surfaces and tooling from rust, corrosion and abrasive materials.

Application options

  • Ready-to-use aerosol can
  • Wipe-on
  • Atomizing spray gun
  • Brushing


  • 1-G, 5-G pail, 55-G drum, 275-G tote
  • Aerosols (6 oz., 10 oz., 12 oz., 16 oz.)

Capability options

  • Water or solvent-based
  • Glossy, Matte, or Satin
  • Semi-permanent or sacrificial
  • Dilutable or ready-to-use

  • Heat-cure or air-cure/ quick dry
  • Tin-free formulations available
  • Silicone-based options available
  • Surface enhancers and flow promoters available

  • Fiber-reinforced Plastics (FRP)

-Fibers: CRP, fiberglass, metals, boron, cellulose, hardwood, softwood, and ceramic

-Matrix: nylon, polyethylene, polystyrene, polyamides, polypropylene, MDI, Epoxy, Silicone, phenol, polyester, aromatic, polyamide and formaldehyde-based resins

  • Graphite
  • Borosilicate glass matrices
  • Biodegradable matrices
  • Laminar Composites & sandwich structures: metal-polymer, vinyl-metal, etc.
  • Metal Matrices: silicon carbide fiber, titanium, aluminum, magnesium
  • Ceramic Matrices: syntactic foam, dental composites, Cermet (ceramic-metal)

Fiberglass spray lay-up, filament winding, vacuum bag molding, pressure bag molding, RTM (resin-transfer molding), lamination, hand lay-up, molding pre-press preforms, slip-casting, extrusion, pultrusion, forged composites, potting,  Lanxide process (pressure-less metal infiltration), sheet and bulk molded compound

Invar, steel, aluminum, silicone rubber, nickel, carbon-fiber, ceramic, magnesium

McLube offers Composite Release Coatings for the following surface finishes:






(and custom formulations for unique finishes)

Contact McLube for specific product information, pricing, and safety data sheets.

External Resources: Composites World Magazine