SKINFOAM 350 BLACK -Flexible Integral Black Leather Foam

SKINFOAM 350 BLACK is a two-component flexible polyurethane foam with integral skin, formulated in black. Unlike conventional foams, it forms a denser, more resistant outer layer where it contacts the mould, while the interior remains soft and flexible, making it especially suitable for realistic props, animatronics, hairdressing busts and technical parts that require consistency without full rigidity.

Technical specifications

What it is used for

SKINFOAM 350 BLACK excels in applications where a flexible part with a hard surface, black colour built into the material and the ability to reproduce fine details are required. Its moderate expansion (approximately 3 times its volume) makes it easy to control mould filling without excessive pressure.

• Props and set dressing for film, television and theatre requiring consistency without rigidity
• Hairdressing and barbering busts: the integral skin withstands repeated pin and needle insertions without deteriorating
• Figures and parts for animatronics where flexibility with a defined surface is needed
• Scenography and set decoration with a built-in dark finish
• Furniture components: armrests, headrests, technical upholstery
• Automotive components: trims, gear knobs, replacement or custom steering wheels
• Industrial prototypes requiring a resistant skin and a soft core

How to use it

1. Prepare the mould: Make sure the mould is clean, dry and at room temperature (between 18 °C and 25 °C). Apply a suitable release agent to prevent the foam from adhering. Close the mould securely if you are working in a closed system.
2. Weigh the components: Use a precision scale. Mix 100 parts by weight of component A with 43 parts by weight of component B. Do not estimate by eye: the exact ratio determines the cure and final density.
3. Mix quickly: The cream time is 25 seconds and the working time is only 80 seconds. Mix vigorously but avoid introducing too much air. Once the mixture starts to cream, it can no longer be manipulated.
4. Pour into the mould: Introduce the mixture into the mould before expansion begins, or right at the start of creaming, depending on the technique used (free rise or closed mould). The foam will expand to approximately 3 times its volume.
5. Close the mould and wait: If working in a closed mould, close it firmly before expansion pressure reaches its peak. Allow a minimum of 3 minutes to cure before demoulding.
6. Demould and finish: Remove the part carefully. The integral skin will have formed on the face in contact with the mould. If necessary, trim flash with a cutter or scissors.

Usage tips

Temperature: the factor that most affects the result

SKINFOAM 350 BLACK is very sensitive to temperature. Below 18 °C, the reaction slows down, the cure is incomplete and the density may vary. Above 28 °C, working times shorten even further and the foam may expand unevenly. If your workshop is cold, warm the components by submerging them in warm water (35–40 °C) for 10–15 minutes before mixing. The mould should also be warm, never cold.

Density and expansion control

The final density of the part depends on the amount of material poured relative to the mould volume. If you completely fill a closed mould, the foam cannot expand freely and you will obtain a higher density (stiffer, heavier). If you leave space or work with free rise casting, the density approaches the nominal value of 350 kg/m³. Experiment with small quantities to calibrate the expansion before working with the final mould: remember that expansion is approximately 3 times the original volume.

Moisture: the enemy of polyurethane foams

Any trace of moisture in the mould, in the tools or in the components generates additional CO₂ during the reaction, resulting in unwanted bubbles or open cells. Always dry the mould before applying the release agent. If the components have been stored in a humid environment, discard the material if you observe solid deposits or a change in viscosity in component B. Store containers sealed with nitrogen or with desiccant if you use them intermittently.

Frequently asked questions