8670/33 is a water-based emulsion of waxes and oils, formulated in Ingwiller to demold cold-cure flexible polyurethane foams and rigid foams. The same drum therefore works on two families of parts:

• cold-cure flexible foams: car seat cushions and backrests, motorcycle seats, cushions and armrests for indoor furniture;
• rigid foams: technical parts and structural components molded in polyurethane.

For the automotive sector, it joins the range of release agents for polyurethane parts: seats, steering wheels, dashboards, headliners. It also complements the 8670/31 designed for flexible foams, with the same water-based approach. A motorcycle seat on Monday, a rigid part on Tuesday, and always the same spray gun setting.

A water-based emulsion replaces the solvent phase with water: it is an alternative to solvent-based release agents, with an equally clean release. This is the approach the Ingwiller manufacturer, in the Bas-Rhin department, follows across its water-based industrial chemistry.

On a seat line, three benefits show from the very first cycles:

• a clean release: the foam comes off the mold without tearing or skin damage;
• a dry grip after demolding: the part is not tacky and goes straight to upholstery or inspection;
• a ready-to-use product: no dilution to measure, no mix to prepare at the start of the shift.

Foam belongs on the seat, not stuck in the mold. The steps for switching from a solvent-based product are detailed in our article on water-based release agents for polyurethane. And from 10 to 12 November 2026 in Stuttgart, Foam Expo Europe is the right place to talk it through with the technical team.

8670/33 is sprayed onto a clean, dry mold heated to 50 to 60 °C, with a 0.3 mm nozzle. The technical data sheet describes a four-step routine, and each step has a reason.

• Clean the mold thoroughly and dry it: every trace of a previous release agent must be gone before the first coat.
• Condition the cavity with a generous first coat, then wipe it carefully with a clean cloth.
• Spray two or three further coats, without wiping, before the first polyurethane injection.
• Let the mold dry between each coat and before injection: water residue damages the foam skin.

Here are the start-up settings, to be fine-tuned on your line with your molds and your cycle time:

Your molds, your spray robot and your cycle time decide the final setting: that is exactly what a trial under industrial conditions is for.

The right release agent depends on the foam and the process: cold-cure flexible and rigid for 8670/33, flexible low-VOC for 8670/31, recycled for 1701/129. The range of release agents for polyurethane foam reads as follows:

• 8670/33: cold-cure flexible PU foams and rigid foams, car seats, motorcycle seats, indoor furniture;
• 8670/31: flexible and rigid foams, car seats and headrests, about 79.8% water for 10% solvents;
• 1701/129: recycled foams for the sports industry;
• 1701/105: polyurethane sandwich panels for construction.

Torn between two references? Send us your foam type and your mold temperature: the sample leaves Ingwiller with the right number on it.