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The fast-curing elastomer casting resin: FastElast from Synthene

Publié le 2020-07-09

FastElast, Synthene's new range of fast setting vacuum casting resins.

In order to meet the ever-increasing requirements and constraints of the prototyping market and industry in general, Synthene is now able to offer you, as a complement to its HPE range, the FastElast range.

The FastElast range is available as follows:

  • Two Polyols: FastElast 35P and FastElast 93P
  • 1 Isocianate: FastElast Iso

What is the FastElast system used for?

The FastElast system is a polyurethane elastomer system for the production of flexible parts for prototyping and other technical needs.

Two polyols are combined with an isocyanate to obtain several types of elastomer parts:

  • very flexible 35 ShA
  • to the semi-rigid 93 ShA (=50-55ShD),
  • while offering excellent mechanical performance.

Processing properties depending on the desired hardness

Hardness35A 45A 50A 60A 65A 75A 80A 86A 93A
FastElast 35 A Polyol (g) 100 90 85 75 60 45 30 10 -
FastElast 93 A Polyol (g) - 10 15 25 40 55 70 90 100
FastElast 35-93 A Isocyanate (g) 30 37 41 48 58 69 79 93 100
Viscosity BROOKFIELD LVT at 25°C (mPa.s) According to MO-051 350 310 310 300 300 300 300 300 300
Reactivity on 200 g at 25°C (min.) According to MO-062 12 10 8'30 12'30 10'30 6 7 5 6
Demoulding time at 70°C (h) in-mould proofing at 70°C 2 1 1 1 1 1 1 1 1

The benefits of Synthene's FastElast system:

  • Very low viscosity (between 300 and 350mPa.s) which allows a fast filling of the moulds. This viscosity is particularly adapted to the vacuum casting process.
  • Demoulding time at 70°C one of the fastest on the market!

Demoulding after 1 hour for hardnesses from 45 Shore A to 93 Shore A (2 hours for 35 Shore A)

  • Very good Elongation at break (up to 1110% for 45 Shore A ) and very good tear resistance.
  • Very easily colorable in any light or dark color.

Hardness Shore A ISO 86835* 45 50 60 65 75 8086 93
Elongation at break at 23°C (%) ISO 37 385 1110 732 765 770 830 630 680 616
Tensile stress at break at 23 °C (MPa) ISO 37 1,4 2,7 4,7 5,8 8,3 12,5 13 26 22
Tear strength at 23°C (kN.m-1) ISO 34 7,8 7 15,1 25 29,4 41,2 45 74 60

*Results obtained after 2 hours at 70°C + 7 days at RT

Key points to know:


The conditions of implementation are indicated on the Data Sheet.

Synthene's FastElast system meets the requirements of European directives: 2002/96/EU, 2000/53/EU, 2000/11/EU, 2011/65/EU and 2017/2102/EU (RoHS).

More information :


Synthene's FastElast system is available in :

Do you need information about our range of Synthene? Contact our technical department on +33 426 680 680 or fill in our contact form.


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