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SikaBiresin® UR350

Elastomeric casting resin with good tear resistance

SikaBiresin® UR350 is a 2-component polyurethane elastomeric casting resin for production of semi-flexible molds.  

  • Good tear resistance
  • Very good hydrolysis resistance
  • High abrasion resistance
  • High elongation at break
 
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PRODUCT BENEFITS

  • Good tear resistance

  • Very good hydrolysis resistance

  • High abrasion resistance

  • High elongation at break

 

Areas of Application

SikaBiresin® UR350 is designed for production of semi-flexible molds, forming tools or parts requiring good abrasion and tear resistance. 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® UR350 (A)

Box with tins

6 x 1 kg

Canister20 kg

SikaBiresin® UR350 (B)

Box with bottles

6 x 0.35 kg

Canister7 kg
 

Product Details

Typical Product Data
Properties

SikaBiresin® UR350 (A)

SikaBiresin® UR350 (B)

Chemical base

Isocyanate

Polyol

Color

 

mixed

Colorless

Black

Black

Density

 

cured

1.08 kg/l

1.03 kg/l

1.08 kg/l

Mixing ratio

by weight

by volume

100 : 35

100 : 36

Viscosity (CQP029-4)

 

mixed

19 000 mPa·s

150 mPa·s

3000 mPa·s

Pot life (CQP021-4)

150 g at 23 °C

18 minutes

Demolding time

at 23 °C

at 80 °C

24 hours

2 hours

Curing time

at 23 °C

at 80 °C after gelification

4 days

4 hours

Recommended casting thickness

max. 80 mm

Shore A hardness (CQP023-1 / ISO 868)

A1

A15

80 A

79 A

Tensile strength (CQP036-6 / ISO 37)

12 MPa A

Tear strength (CQP045-1 / ISO 34)

67 kN/m A

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

620 % A

BASHORE resilience (ASTM 2632)

44 % A

Linear shrinkage (CQP014-5)

250 x 50 x 3 mm

3.6 mm/m A

Abrasion resistance (Taber) (ISO 5470)

41 mg/100U A

Glass transition temperature (CQP301-5 / ISO 11357)

-60 °C A

Linear coefficient of thermal expansion (CQP053-1 / ISO 11359)

230 x 10-6 1/K A

Service temperature

-40 – 80 °C

Shelf life

12 months

CQP = Corporate Quality Procedure

A) curing condition: 70 °C for 16 hours

Application

Application Information

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.
To improve the flowability, the isocyanate component can be heated up to 40 °C, taking into account that higher processing temperatures shorten the pot life.

STORAGE CONDITIONS

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