SikaBiresin® UR419 UR458

Elastomeric casting resin for foundry pattern making

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SikaBiresin® UR419 UR458 is a 2-component polyurethane elastomeric casting resin for foundry pattern making.  

  • Cured not sensitive to moisture
  • Good tensile strength
  • Good temperature resistance
  • Customized colors with SikaBiresin® Color Paste
 
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Overview

PRODUCT BENEFITS

  • Cured not sensitive to moisture

  • Good tensile strength

  • Good temperature resistance

  • Customized colors with SikaBiresin® Color Paste

 

Areas of Application

SikaBiresin® UR419 UR458 is designed for casting of abrasion and impact resistant moldings and tools, e.g. core boxes. The Product is also well suited for casting of tough-elastic coatings. 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® UR419 (A)

Box with tins

6 x 1 kg

Canister10 kg
Drum200 kg

SikaBiresin® UR458 (B)

Box with bottles

6 x 0.18 kg

Canister1.8 kg
Drum180 kg
 

Product Details

Properties

Component A

SikaBiresin® UR419

Component B

SikaBiresin® UR458

Chemical base

Isocyanate prepolymer

Amine

Color

 

 

mixed

Colorless-transparent

Yellowish- and reddish-transparent

Reddish-transparent

Density

 

cured

1.0 kg/l

1.15 kg/l

1.1 kg/l

Mixing ratio

by weight

100 : 18

Viscosity (CQP029-4)

 

mixed

4200 mPa·s

330 mPa·s

4000 mPa·s

Pot life (CQP021-4)

500 g at 23 °C

20 minutes

Demolding time

16 hours

Curing time

at 23 °C

7 days

Shore A hardness (CQP023-1 / ISO 868)

97 A

Shore D hardness (CQP023-1 / ISO 868)

45 A

Tensile strength (CQP036-6 / ISO 527)

18 MPa A

Tear strength (CQP045-1 / ISO 34)

58 N/mm A

Elongation at break (CQP036-6 / ISO 527)

500 % 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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