SikaBiresin® UR404

Elastomeric casting resin for mold making

SikaBiresin® UR404 is a 2-component polyurethane elastomeric casting resin for mold making.  

  • Cured not sensitive to moisture
  • Very soft, high elongation at break
  • Good tensile strength and elasticity
  • Very low shrinkage
  • Customized colors with SikaBiresin® Color Paste
 
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Overview

PRODUCT BENEFITS

  • Cured not sensitive to moisture

  • Very soft, high elongation at break

  • Good tensile strength and elasticity

  • Very low shrinkage

  • Customized colors with SikaBiresin® Color Paste

 

Areas of Application

SikaBiresin® UR404 is designed for casting of flexible molds for ceramic and gypsum processing. The product is also suitable for the casting of complex structures. It is recommended for manufacturing of elastic, flexible moldings and components. This product is suitable for experienced professional users only. Tests under actual processing conditions and with additional materials such as coatings and release agents must be performed to proof material compatibility.  

Packaging

    

SikaBiresin® UR404 (A)

Bottle0.8 kg
Canister

8 kg

20 kg

Drum200 kg

SikaBiresin® UR404 (B)

Bottle1 kg
Canister

10 kg

 

Product Details

Properties

SikaBiresin® UR404 (A)

SikaBiresin® UR404 (B)

Chemical base

Isocyanate prepolymer, unfilled

Amine, unfilled

Color

 

mixed

Colorless-transparent

Reddish-transparent

Reddish-transparent

Density

 

cured

1.05 kg/l

1.03 kg/l

1.05 kg/l

Mixing ratio

by weight

80 : 100

Viscosity (CQP029-4)

 

mixed

6500 mPa·s

300 mPa·s

3000 mPa·s

Pot life (CQP021-4)

500 g at 23 °C

25 minutes

Demolding time

24 hours

Curing time

at 23 °C

5 days

Shore A hardness (CQP023-1 / ISO 868)

40 A

Tensile strength (CQP036-6 / ISO 527)

4 MPa A

Tear strength (CQP045-1 / ISO 34)

7 N/mm A

Elongation at break (CQP036-6 / ISO 527)

600 % A

Linear shrinkage (CQP014-5)

500 x 25 x 20 mm

0.04 % A

Shelf life

12 months

CQP = Corporate Quality Procedure

A) curing condition: 23 °C for 14 days

Application

Surface preparation

The material, processing and mold or master-model temperature shall be between 18 °C – 25 °C.
Make sure the mold or master model is clean, dry, dust and grease free.
If mold or master-model surface is porous, it must be sealed prior applying the release agent.
It is recommended to use wax-based release agents. For further information regarding Sika release agent consult the corresponding Product Data Sheet.

Application

Immediately after mixing pour the Product into the mold starting at the deepest point.
Demolding time may vary depending on casted thickness and room temperature.
If using wood as support core or PUR foam boards with low to middle density, a previous sealing is necessary.
The compatibility of the sealing on PUR foam must be tested separately.

STORAGE CONDITIONS

Both components must be stored at temperature between 15 °C and 25 °C in original unopened containers.

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