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Liquid X-30 Expanding Polyurethane Foam

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Quart Kit1/2 Gallon Kit2 Gallon Kit10 Gallon Kit
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This system consists of two components - "X-30" Resin and "X-30" Catalyst. When the resin and catalyst are mixed in equal volumes they expand into a rigid closed-cell foam of 2 pound density. "X-30" Foam expands up to 30 times its liquid volume. Small-batch mixes are recommended. Cured foams can be easily trimmed, cut and shaped with common woodworking tools. Just mix equal amounts of Side A (Resin), and Side B (Catalyst), stir vigorously, and pour into an enclosed area¡Xleaving plenty of room for expansion. X-30 is unaffected by gasoline, oil, solvents or other petroleum products, and is ideal for pour-in-place buoyancy or insulation. Use toluene or MEK for cleanup. "X-30" Foam contains a highly reactive agent and is classified as a toxic material. It is combustible, a strong skin sensitizer and eye irritant. Avoid contact with the skin. Use rubber gloves when handling.

Used for: Flotation, thermal and acoustical insulation reinforcement and miscellaneous void filling. Most small pleasure boats can be made "sink-proof" with approximately two gallons of "X-30". Data sheet available. "X-30" Foam contains a volatile fluorocarbon and should be stored at 70°F. or lower. "X-30" is used on the Osprey II bottom hull, canopy, nose cone, etc., requiring about four gallons of material (two gallons of each). Shelf life at least six months. Users have reported "more than two years shelf life".

Note: When working with X-30 always cover your working surface with plastic film, as X-30 will soak through newspaper or cardboard and will be difficult to remove.
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


X-30 Expanding Foam Volume
Kit Size 1 Qt. Kit 1/2 Gal. Kit 2 Gal. Kit 10 Gal. Kit
Side A 16 oz. (1 pt.) 32 oz. (1qt.) 1 gal. 5 gal.
Side B 16 oz. (1 pt.) 32 oz. (1qt.) 1 gal. 5 gal.
Foamed Volume (approx.) cu. ft 1 2 8 40
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Great product. A little does a lot! Works well bonding polystyrene pieces together in approved areas. Fills voids well. Will purchase again.

Barry S Verified Purchase


February 14, 2024

Great product

Frank M Verified Purchase


March 7, 2022

Exactly as advertised, works as I expect it. So far its seems to be easy to form, easy to cut, easy to sand and it is light. Also holds very well to other surfaces. Only con is... its a bit more expensive than the stuff that the Marine guys sell.

July 16, 2018


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Regarding Part # 01-08800: What is the weight of this Liquid X-30 foam once it has expanded and cured?

It would be approximately 2 lbs. per cu. ft.

Q: Is this product compatible with polyester type fiberglass resin?

This product has not been tested with polyester type fiberglass resin, so it is not recommended.

Q: Is there a Tech Data Sheet available for this Liquid X-30 foam?

Yes, we have added the Tech Data Sheet to the Documents tab of this webpage for download.

Q: I need to fix my aluminum cowling. Will this stick to aluminum?

There is not data on the peel and shear strength adhesive strength to aluminum, but as long as the aluminum is properly sanded and clean, this will stick to aluminum.

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