SikaBiresin® UR548

Elastomeric casting resin for mold making

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SikaBiresin® UR548 is a 2-component polyurethane elastomeric casting resin for mold making.  

  • High elongation at break
  • Casting thickness up to 80 mm
  • Good flow behavior
  • Solvent and mercury free
  • Good mechanical resistance
 
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Overview

PRODUCT BENEFITS

  • High elongation at break

  • Casting thickness up to 80 mm

  • Good flow behavior

  • Solvent and mercury free

  • Good mechanical resistance

 

Areas of Application

SikaBiresin® UR548 is designed for production of molds for concrete industry by hand casting or with 2-component low pressure equipment.
The Product is especially well suited for large serie production.
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® UR503 (A)

Canister

2.5 kg

5 kg

Drum227.5 kg

SikaBiresin® UR548 (B)

Pail

16.7 kg

 

Product Details

Properties

Component A

SikaBiresin® UR503

Component B

SikaBiresin® UR548

Chemical base

Isocyanate

Polyol

Color

 

mixed

Amber

Ochre

Ochre

Density

 

cured

1.16 kg/l

1.33 kg/l

1.31 kg/l

Mixing ratio

by weight

30 : 100

Viscosity (CQP029-4)

 

mixed

2000 mPa·s

1900 mPa·s

2000 mPa·s

Pot life (CQP021-3 / Gel Timer TECAM)

130 g at 23 °C

20 minutes

Demolding time

16 hours

Curing time

at 23 °C

4 days

Casting thickness

up to 80 mm

Shore A hardness (CQP023-1 / ISO 868)

50 A

Tensile strength (CQP036-6 / ISO 37)

3.4 MPa A

Tear strength (CQP045-1 / ISO 34)

14 kN/m A

Elongation at break (CQP 036-6 / ISO 37)

550 % A

Linear shrinkage (CQP014-5)

100 x 100 x 1000 mm

1 mm A

Abrasion resistance (Taber) (ISO 5470)

20 mg/100U A

Glass transition temperature (CQP301-5 / ISO 11357)

0 °C A

Shelf life

6 months

12 months

CQP = Corporate Quality Procedure

A) curing condition: 70 °C for 16 hours

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.
PUR foam boards with a low to medium density are not recommended as a master model.
The compatibility of the sealing on PUR foam must be tested separately.
To achieve the highest performance, leave the elastomeric mold at a temperature ≥ 23 °C for 4 days before using it.

STORAGE CONDITIONS

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

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