Soft Foam - SF4 (Polyurethane)

Soft Foam 4 is an easy to mix 2:1 (by weight) soft to medium, low density, self-skinning flexible polyurethane foam. The system is designed to be a medium to high rise, lightweight foam with a cream time of 60 seconds.


Key Characteristics

– 2:1 easy to mix ratio (by weight)
– Soft and compliant foam with a low density (typically 150-180 kg/M3, 8-10 lb/ft3)
– Lightweight
– CFC-free (water blown) and non-flammable
– Can be pigmented
– Can be cut and shaped with appropriate tools


Soft Foam 4, also known as SF4 has been primarily formulated for use within moulding and casting applications, which require a moderate skin.

The processing characteristics of SF4 allow for mixing by hand, drill or machine. However best results are obtained with a machine.

The versatile nature of the material allows it to be used in a range of applications including:

Film, Television and Stage props (for special effects)
Mould Backing
Industrial Cushioning, Padding, Sound and Vibration Dampening
Scenery Design


How much foam do I need? SF4 typically rises by a factor of 6-8 times its original volume, depending on the circumstances of use. It is strongly advised to calculate the foam prior to casting, otherwise overspill can occur, generating health and safety risks, requiring clean-up and wasting material.

Soft Foam - SF4 (Polyurethane)


    Contact Details

    Ph : +353 83 4027887

    E :

    Open to Public :

    Unit C2, Metropoint Business Park,

    Swords, Co. Dublin

    Trade Only :

    Odyssey Studios, Corcanree Business Park

    Dock Road, Limerick

    Stay Connected

    • Facebook
    • YouTube
    • Instagram

    Why not sign up to our Mailing List for all the latest news!

    Got a technical question?

    Not sure what product to use? What way to approach a project? Email us at and we will do our best to help.

    Arachnid FX Productions

    In addition to material supply, Arachnid FX is also composed of Arachnid FX Productions.

    Catering to everyone from the high end collector and cosplayer to the latest TV or Film production.

    From prop rentals, 3d printing and scanning, moldmaking and more!

    If you have an idea you want to bring to life, get in contact!

    Customer Information

    © Copyright 2019  Arachnid FX. All rights reserved