LOCTITE HC 9823.1 / 9872.1 / 9875, EF 9899 / 9890 / 557, EF 9835 / 9840 AERO syntactic and expanding films, honeycomb fillers and abradable seals

Country: · Model: HC 9823.1 / 9872.1 / 9875, EF 9899 / 9890 / 557, EF 9835 / 9840 AERO

Syntactic and expanding film materials for sandwich structures and engines, where the epoxy matrix is filled with microspheres. The non-expanding films HC 9823.1, 9872.1 and 9875 have compressive strength of 6.9, 17.2 and 44.8 MPa at densities of 19, 26 and 35 lb/ft³. Expanding films grow 2–3 times.

Non-expanding syntactic films: HC 9823.1 (co-cure with prepregs at 121 °C), HC 9872.1 and HC 9875 (with prepregs at 177 °C; 9875 has high crush strength); strength 6.9 / 17.2 / 44.8 MPa at density 19 / 26 / 35 pcf
Expanding films: EF 9899 (SynSpand, cure 121 or 177 °C, closed-cell structure), EF 9899CF (low exotherm, density 0.29–0.56 g/cm³), EF 9890, EF 557 (MA 557); expansion 2–3 times
Abradable seals: EF 9835, EF 9840 — for gas turbine engine compressors; erosion resistance at low density
Application: honeycomb stabilization, edge closeout, honeycomb splicing, RTM cores, local thickening

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Technical specifications

Non-expanding syntactic films	HC 9823.1 (co-cure with prepregs at 121 °C), HC 9872.1 and HC 9875 (with prepregs at 177 °C; 9875 has high crush strength); strength 6.9 / 17.2 / 44.8 MPa at density 19 / 26 / 35 pcf
Expanding films	EF 9899 (SynSpand, cure 121 or 177 °C, closed-cell structure), EF 9899CF (low exotherm, density 0.29–0.56 g/cm³), EF 9890, EF 557 (MA 557); expansion 2–3 times
Abradable seals	EF 9835, EF 9840 — for gas turbine engine compressors; erosion resistance at low density
Application	honeycomb stabilization, edge closeout, honeycomb splicing, RTM cores, local thickening
Storage	−18 °C
Qualification	major OEMs (per the brochure)

Specifications are taken from the manufacturer’s technical documentation. Updated 11/10/2026.

Description

The syntactic material gives a lightweight filler with high compressive strength, it can be contoured to the panel thickness and used for local thickening. HC 9823.1 cures together with prepregs at 121 °C, HC 9872.1 and HC 9875 at 177 °C, and 9875 is designed for high compressive loads. EF 9899 (SynSpand) cures at 121 or 177 °C and expands with a closed-cell structure, EF 9899CF has a density after cure of 0.29–0.56 g/cm³ and low exotherm. EF 9890 cures at 121 °C for abradable seals, EF 557 (MA 557) is an expanding adhesive for sealing, splicing and reinforcing honeycombs. The abradable EF 9835 and EF 9840 form in jet engine compressors a blade-rub strip with high erosion resistance, which gives minimal clearances. Stored at −18 °C.

How to choose

The choice starts with whether expansion is needed. For thick and complex sandwich structures take the non-expanding HC, and by density and compressive strength one of the three grades will fit. For thick honeycomb joints, deep cell filling and co-cure, EF 9899 or EF 9899CF are better. For the engine gas path the abradable EF 9835 or EF 9840 are needed.

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LOCTITE HC 9823.1 / 9872.1 / 9875, EF 9899 / 9890 / 557, EF 9835 / 9840 AERO syntactic and expanding films, honeycomb fillers and abradable seals. We reply within one business day.