Fast Cast Polyurethane Casting Resin 2kg Pack

Fast Cast Polyurethane Casting Resin
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Your Price £24.34 (ex VAT)
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Product Description

Easy Composites' Fast Cast Polyurethane Casting Resin is a high quality, low viscosity odourless general purpose casting resin for use in model/sculpture casting, pattern making and prototyping/product development.

As the name suggests the resin is very fast curing making it ideal for production runs whilst its low price ensures that even larger castings can be produced cost effectively.

Easy Composites' Fast Cast system is also one of the lowest viscosity casting resins on the market enabling it to flow freely into the most complex moulds where it with faithfully recreate even the finest surface detail. The ultra-low viscosity also opens up the possibility of casting without the need for degassing the mixed resin before pouring.

Whether you’re new to casting or a seasoned professional you’re sure to get excellent results with this highly regarded resin system.


  • Very fast de-mould (20mins!)
  • Incredible fine surface detail reproduction
  • Ultra-low viscosity
  • Easily pigmented
  • Supports a high ratio of filler
  • Highly heat resistant
  • Very machinable

Suggested Uses

In conjunction with a silicone mould, Easy Composites’ Fast Cast resin can be used to produce beautifully detailed sculptures, figurines, RPG character replicas and modifications (Warhammer, Lord of the Rings, White Dwarf etc.) in fact just about anything you would like to accurately reproduce in a durable, heat resistant plastic.

Pack Size

The resin is supplied in a choice of 2kg, 4kg, 10kg and 50kg packs each containing the correct ratios of Part A and Part B.

For larger quantities or pack sizes please contact us.


Property Units Resin Hardener Combined
Material - Formulated Polyol Isocyanate Polyurethane
Appearance - Off-White Liquid Amber Liquid Off-White Liquid
Viscosity (25°C) mPa.s 80-100 45-85 50-100
Density g/cm³ 1.00 - 1.05 1.10 - 1.15 1.05 - 1.10
Minimum Casting Thickness mm - - 2

Working & Cure Times

Pot Life @ 25°C Demould Time 200g (20mm) @ 25°C Demould Time 100g (5mm) @ 25°C
3'30 - 4'30" 15 - 20mins 30 - 40mins

Cured Properties

Shore Hardness Linear Shrinkage Tensile Strength Elongation at Break Flexural Strength Flexural Modulus Glass Transition Temp
D 500 x 50 x10 mm ISO 527-2:1993 (MPa) ISO 527-2:1993 (%) ISO 178:1993 (MPa) ISO 178:1993 (MPa) °C
75-80 Less than 0.05 10 - 15 4 - 6 30 - 40 800-1300 62 - 67

Mixing Ratio

100 p.b.w. Fast Cast Polyurethane Part A
100 p.b.w. Fast Cast Polyurethane Part B

Further Information

For detailed instructions and advice please download the accompanying Technical Data Sheet.

Transport and Delivery Information

This product is classified as safe for carriage to all destinations. No restrictions apply.

Technical Questions

What can I use to clean the resin off tools?

We would recommend using Acetone to clean up before the resin has cured. Once cured, the Fast Cast is a rigid plastic and nothing will really remove it other than mechanical means (scraping/chipping it off).

Can I mix the pigment in part A and leave it in storage for later use?

Yes you can mix a pigment into part A for later use. However, remember to thoroughly shake and mix the container again before use as some of the solids content may settle into the bottom of the container.

Is this resin non-toxic? And safe for children to handle finished product I.e miniature figures.

It's non-toxic and safe to handle when mixed properly and cured correctly. It's not non-toxic in its uncured (liquid) state so the mixing and casting is not suitable for children but the cured products would be.

Why can't I use condensation cured silicone moulds with this casting system?

There's no reason, in fact they work brilliantly. The only type of polyurethane that you can't use with condensation cure silicone rubber is our Water Clear Polyurethane which, owing to its particular sensitivity to moisture, will become sticky and airated if you cast it into a condesation cure silicone mould.

Should I be wearing a respirator when using polyurethane resins?

We would never advise against the use of a respirator wherever fumes or vapours are present however the hazard risk of vapours from a Fast Cast polyurethane are very small. Most people would consider working in a reasonably well ventilated (or unconfined) area sufficient to be perfectly safe.

Can I vary the hardness of Fast Cast by varying the mixing ratio?

No, definitely not. Varying the mixing ratio will not change the hardness of our Fast-Cast other than causing curing problems potentially leading to an unusable part or a part with degraded performance characteristics.

Is Fast Cast UV resistant and suitable for outdoor use?

Fast Cast is UV stable and can therefore be can be used in outdoor applications however if you use filler powders or pigments then you would need to ensure that these are as UV stable as possible too, in order to avoid discolouration.

Do I need a Release Agent with this resin?

If casting into silicone moulds, then no release agent is necessary. Otherwise, if you’re casting into a rigid mould (such as an epoxy, polyester, or even metal mould) then you will need a release agent and we would recommend our Easy-Lease Chemical Release Agent.

Does this resin have a strong smell, and is it suitable for use making models (i.e. paintable)?

Fast Cast is very low odour; you would hardly detect it in a normal home and certainly not in a workshop. Once cast, the cured casting would be odourless. It's a great resin for model making, figure casting and that sort of thing. You can pigment the resin to give you your base-colour and then just paint on detail or you can just cast it in the natural colour and then paint the whole thing. Wash the piece thoroughly in soapy water and/or give it a gentle rub with a scotch-pad to ensure the paint sticks well.

What temperature can the cured resin withstand? I would like to mould a component that will be in contact with metal and water at no more 120°C?

The 'Glass Transition' temperature or Tg of the Fast-Cast resin is 62-67°C which means that above this temperature the resin would start to soften or distort, therefore it's unlikely that it would be suitable for making your component that would be subjected to temperatures of up to 120°C.

Instead, you might need to be looking at something like our Very High Temperature Epoxy. It might be overkill slightly because it can take up to 180°C but at least you could be confident that it would not distort or weaken at 120°C.

I'm hoping to produce a casting in a 3d printed plastic mould. Are there any mould materials with which this resin reacts unfavourably?

The resin itself is unlikely to have a bad reaction with any conventional plastic (i.e. soften or melt it etc.) but you will need to give consideration to whether the resin would stick to the plastic you use for the mould. In most cases, particularly for the types of plastic that you can 3D print with, you will find that the Fast-Cast would stick to them. The conventional way to overcome this is the have a positive (male) shape 3D printed and then use an RTV silicone (like our CS2 Condensation Cure Silicone) to make a female mould into which you can cast the Fast-Cast. If you really do want to release direct from a 3D printed plastic mould then you will need to experiment with various release agents (like our Easy-Lease for example) to see if the Fast-Cast will release off the plastic mould.

Is this casting resin clear?

No, Fast Cast is not a clear resin system. When mixed and cured Fast Cast is a creamy-beige colour. It is light enough in colour to be successfully pigmented using Polyurethane Colour Pigments. For a properly clear casting resin you would want either our Waterclear Polyurethane Casting Resin or our Waterclear Polyester Casting Resin.

Can you use die on it? - I want to die it black.

Yes, Fast Cast is pigmentable. The type of pigment that you should use would be a Polyurethane Pigment Paste. We have a Black Polyurethane Pigment as well as a wide range of other colours.

Can Fast Cast it be used in latex moulds?

Yes, absolutely. Latex moulds are perfectly fine. The cast part will release well.

Download Product Datasheets

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