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GracoRoberts supplies epoxy syntactic systems for core filling, edge filling, potting, and void repair in aerospace, defense, and composite manufacturing. Syntactic epoxies incorporate hollow glass or phenolic microspheres into the resin matrix, producing low-density materials with strong mechanical performance at reduced weight.
Our portfolio includes Resin Formulators' syntactic systems, Huntsman Epocast syntactic series, and Loctite syntactic film products, available in barrier kit, bulk kit, cartridge, semkit, and frozen formats. Many products are qualified to Boeing BMS, Sikorsky SS, Northrop Grumman, and military program specifications.
For custom syntactic formulations, see our custom formulation services.
Two-part systems for core fill, edge stabilization, fastener potting, and void repair in composite sandwich panels. Products include Resin Formulators’ RF 1131 A/B, RF 1133 A/B, RF 1135 A/B, RF 1141 A/B, RF 1143-1 A/B, and Huntsman Epocast 1615, 1626, 1628, and 89537 series.
Sheet-format syntactic films for honeycomb core fill and panel edge applications without mixing or dispensing. Products include Loctite EF 9899CF expanding syntactic film and HC 9875 syntactic honeycomb fill film.
Structural void-filling compounds for airframe assembly and interior applications with FST requirements. Products include 3M Scotch-Weld EC-3505 FR, EC-3515 FR, and EC-3550 FST.
Frozen systems for programs requiring extended out-life and controlled material use. Products include Huntsman Epocast 938-A3.
We offer certificates on request including COA and COC, lot traceability, shelf life and out-life management, and approved sourcing aligned to program specifications. See our certifications and quality page for more information.
Talk to our team to discuss your application or qualification requirements.
An epoxy syntactic system is a two-part epoxy resin containing hollow glass or phenolic microspheres. The microspheres reduce cured density while maintaining compressive strength, making syntactics suited to lightweight fill, potting, and edge-filling in aerospace composite structures.
Syntactic foams are higher-volume systems for filling large cavities. Syntactic fill and edge-filling compounds are lower-density, lower-viscosity systems for precision applications such as honeycomb edge stabilization, fastener potting, and void repair. The distinction is primarily in density, viscosity, and application scale.
Yes. Epocast 1615, 1626, 1628, 1633, 1635, and 89537 are qualified to Boeing BMS 5-28 and related specifications. Confirm qualification status against the product data sheet and program approval list.
Standard two-part kits store at room temperature away from heat and sunlight. Frozen systems require storage at minus 18 degrees Celsius or below. Follow the product data sheet for shelf life, thaw times, and out-life tracking.
Syntactic films are pre-cut sheet materials laid up alongside composite laminates requiring no mixing. Liquid compounds are mixed and applied by hand, gun, or syringe, suited to repair and complex geometry. Films suit high-volume production; liquids suit repair and low-volume applications.
Yes. COA and COC on request, with lot traceability and out-life documentation. Contact us to discuss program documentation requirements.
