SikaBiresin® UR419

Elastomeric casting resin for foundry pattern making

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SikaBiresin® UR419 is a 2-component polyurethane elastomeric casting resin for foundry pattern making.
It is a very versatile product which is used in various applications.
The Product can also be combined with the hardener SikaBiresin® UR419 L to achieve different Shore hardness levels and tailored mechanical properties.  

  • Not sensitive to moisture
  • Very high abrasion resistance
  • High elongation at break
  • Good flow behavior
  • Good temperature resistance
  • Customized colors with SikaBiresin® Colour Paste
 
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Overview

PRODUCT BENEFITS

  • Not sensitive to moisture
  • Very high abrasion resistance
  • High elongation at break
  • Good flow behavior
  • Good temperature resistance
  • Customized colors with SikaBiresin® Colour Paste
 

Areas of Application

SikaBiresin® UR419 is designed for casting of abrasion and impact resistant parts and tools, e.g. core boxes.
The Product is as well suited for applications where tough-elastic coatings are required.
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® UR419 (B)

Box with bottles

6 x 0.16 kg

Canister

1.6 kg

16 kg

 

Product Details

Properties

SikaBiresin® UR419 (A)

SikaBiresin® UR419 (B)

Chemical base

Isocyanate prepolymer

Amine

Color

   

mixed

Colorless-transparent

Brownish-transparent

Colored-transparent

Density

 

cured

1.01 kg/l

1.02 kg/l

1.06 kg/l

Mixing ratio

by weight

100 : 16

Viscosity (CQP029-4)

 

mixed

4200 mPa·s

200 mPa·s

2800 mPa·s

Pot life (CQP021-4)

500 g at 23 °C

6 minutes 

Demolding time

depending on casting thickness

1 – 3 hours

Curing time

at 23 °C

5 days

Shore A hardness (CQP023-1 / ISO 868)

98 A

Shore D hardness (CQP023-1 / ISO 868)

54 A

Tensile strength (CQP036-6 / ISO 527)

25 MPa A

Elongation at break (CQP036-6 / ISO 527)

320 % A

Tear propagation resistance (CQP045-1 / ISO 34)

68 N/mm A

Linear shrinkage (CQP014-5)

500 x 40 x 10 mm

0.05 % A

Abrasion resistance (CQP112-1 / ISO 4649)

90 mm3 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.
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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