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SikaBiresin® UR305

Elastomeric casting resin for multi-purpose applications

SikaBiresin® UR305 is a 2-component polyurethane elastomeric casting resin. It is a very versatile product which can be used in various applications.  

  • Good tensile strength
  • High elongation at break
  • Very high abrasion resistance
  • Very low shrinkage
  • Casting thickness up to 50 mm
  • Acceleration for faster demolding possible
  • Customized colors with SikaBiresin® Colour Paste
 
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PRODUCT BENEFITS

  • Good tensile strength

  • High elongation at break

  • Very high abrasion resistance

  • Very low shrinkage

  • Casting thickness up to 50 mm

  • Acceleration for faster demolding possible

  • Customized colors with SikaBiresin® Colour Paste

 

Areas of Application

SikaBiresin® UR305 is designed for coating of wear stressed surfaces in machine, container and automotive construction as well as for manufacture of seals, gaskets, elastic supports and molds. 
The product is also well suited for encapsulation of electronic components and sensitive instruments for protection against mechanical and water influence.
It is also used as an adhesive for spall liners in armored vehicles.
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® UR305 (A)

Box with bottles

6 x 1 kg

Can10 kg
Hobbock20 kg
Drum200 kg

SikaBiresin® UR305 beige (B)

Box with bottles

6 x 0.6 kg

Pail6 kg
Hobbock12 kg
Drum200 kg

SikaBiresin® UR305 black (B)

Hobbock12 kg
Drum200 kg

Biresin® HC586

Can

0.5 kg

 

Product Details

Typical Product Data
Properties

SikaBiresin® UR305 (A)

SikaBiresin® UR305 (B)

Chemical base

Isocyanate prepolymer

Polyol

Color

 

mixed

Colorless-transparent

Beige, black

Beige, black

Density

 

cured

1.14 kg/l

1.03 kg/l

1.2 kg/l

Mixing ratio

by weight

100 : 60

Viscosity (CQP029-4)

 

mixed

4200 mPa·s

600 mPa·s

2300 mPa·s

Pot life (CQP021-3 / Gel Timer TECAM)

500 g

20 minutes

Demolding time

16 hours

Curing time

at 23 °C

7 days

Shore A hardness (CQP023-1 / ISO 868)

89 A

Tensile strength (CQP036-6 / ISO 527)

25 MPa A

Elongation at break (CQP036-6 / ISO 527)

300 % A

Tear propagation resistance (CQP045-1 / ISO 34)

27 N/mm A

Linear shrinkage (CQP014-5)

500 x 40 x 50 mm

0.1 % A

Abrasion resistance (CQP112-1 / ISO 4649)

75 mm3 A

Shelf life

12 months

CQP = Corporate Quality Procedure

A) curing condition: 23 °C for 7 days

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.

STORAGE CONDITIONS

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