Sista PU Foam Universal 750 ml, Straw Type

Sista is Henkel's foam and sealant brand, and this is the 750 ml Universal can sold here. It is the straw type, not a gun foam: the pack prints “STRAW · PIPETTE” beneath “PU FOAM” and the applicator straw is clipped to the side of the can, so no foam gun is needed. Henkel's own safety data sheet for the Africa market identifies it as Sista PU Foam TR and describes it as a one-component foam with propellant gas — a polyurethane that cures on the moisture in the air and in the substrate.

Henkel publishes no application list for this particular can, so take the following as what an expanding gap-filling foam is used for on site rather than as a Henkel specification: closing and insulating the gaps a trowel cannot reach. As with any expanding polyurethane foam, mineral surfaces are dampened before foaming, anything that could be pushed out of square is braced until the foam has set, and the bead is run in at about a third of the gap because it grows. Cured foam has to be covered — painted, plastered or trimmed over — because Henkel publishes that requirement for its PU foams: unprotected foam breaks down in sunlight.

Sold by the full carton of 12. Henkel publishes no technical data sheet for this exact can, only its safety data sheet, so we quote no yield, cutting time, cure time or fire class for it. The gold badge on the pack carries a figure we cannot read reliably, and we are not going to guess at it. If you need those numbers for a specification or a tender, ask us and we will request the datasheet from Henkel. This is a diisocyanate foam and an extremely flammable aerosol; the hazard information below is Henkel's own and it is not boilerplate.

Specifications

Henkel safety data sheet for Sista PU Foam TR, SDS No. 528657 V002.0, Henkel South Africa. Performance figures are not published for this product.

• Type: one-component moisture-curing polyurethane foam, hand-held straw / pipette application
• Intended use, as Henkel states it: foam, one-component with propellant gas
• Isocyanate content: 10–30% 4,4′-methylenediphenyl diisocyanate (MDI)
• Propellants: dimethyl ether, isobutane, propane and n-butane
• Appearance: pressurised can; foam; brownish
• Density of the product as supplied: 1.2 g/cm³ at 23 °C
• Flash point: −20 °C
• Yield, tack-free time, cutting time, full cure time, temperature range, fire class and approvals: not published by Henkel for this product

Hazards — Henkel's published classification

• H222 Extremely flammable aerosol
• H229 Pressurised container: may burst if heated
• H315 Causes skin irritation
• H317 May cause an allergic skin reaction
• H319 Causes serious eye irritation
• H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled
• H335 May cause respiratory irritation
• H351 Suspected of causing cancer
• H362 May cause harm to breast-fed children
• H373 May cause damage to organs through prolonged or repeated exposure
• H413 May cause long lasting harmful effects to aquatic life

Handling, as Henkel publishes it for its PU foams: store and transport the can upright, wrapped, and never in the passenger compartment of a vehicle. Remove fresh foam from skin at once and wipe residues with vegetable oil; fresh foam on other surfaces comes off with PU cleaner; cured foam can only be removed mechanically. Henkel also publishes that since August 2023 users of reactive polyurethane products containing more than 0.1% MDI must be able to demonstrate personal training in safe handling on request, and points to the FEICA training tool at www.feica.eu/PUinfo.