SikaBiresin® UR406

Elastomeric casting resin for manufacturing of flexible molds

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SikaBiresin® UR406 is a 2-component polyurethane elastomeric casting resin with very good flow behavior for manufacturing of flexible molds.  

  • Insensitive to moisture
  • Very good flow behavior during processing
  • Rubbery, high elongation at break
  • Good tensile strength and elasticity
  • Minimum water absorption
 
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Overview

PRODUCT BENEFITS

  • Insensitive to moisture

  • Very good flow behavior during processing

  • Rubbery, high elongation at break

  • Good tensile strength and elasticity

  • Minimum water absorption

 

Areas of Application

SikaBiresin® UR406 is designed for casting of flexible molds for ceramic and gypsum processing. The Product is also well suited 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® UR406 (A)

Canister

10 kg

SikaBiresin® UR406 (B)

Canister

3 kg

 

Product Details

Properties

SikaBiresin® UR406 (A)

SikaBiresin® UR406 (B)

Chemical base

MDI prepolymer

Amine

Color

 

mixed

Yellowish-transparent

Reddish-transparent

Yellowish-transparent

Density

 

cured

1.03 kg/l

1.05 kg/l

1.05 kg/l

Mixing ratio

by weight

100 : 30

Viscosity (CQP029-4)

 

mixed

3000 mPa·s

830 mPa·s

2800 mPa·s

Pot life (CQP021-4)

500 g at 23 °C

18 minutes

Demolding time

16 hours

Curing time

at 23 °C

7 days

Shore A hardness (CQP023-1 / ISO 868)

55 A

Tensile strength (CQP036-6 / ISO 527)

5 MPa A

Tear strength (CQP045-1 / ISO 34)

12 N/mm A

Elongation at break (CQP036-6 / ISO 527)

450 % A

Shelf life

12 months

CQP = Corporate Quality Procedure

A) curing condition: after demolding 14 days at 23 °C

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.
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.
Demolding time may vary depending on casted thickness and room temperature.

STORAGE CONDITIONS

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

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