SikaBiresin® UR404 UR620

Elastomeric casting resin for mold making

Image not available

SikaBiresin® UR404 UR620 is a 2-component polyurethane elastomeric casting resin for mold making.  

  • Cured not sensitive to moisture
  • High elongation at break
  • Good tensile strength and elasticity
 

Overview

PRODUCT BENEFITS

  • Cured not sensitive to moisture
  • High elongation at break
  • Good tensile strength and elasticity

 

Areas of Application

SikaBiresin® UR404 UR620 is designed for casting of flexible molds for ceramic and gypsum processing. The Product is recommended for manufacturing of elastic, flexible moldings and components by hand casting or with 2-component low pressure equipment. 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® UR404 (A)

Bottle0.8 kg

Canister

8 kg

20 kg

Drum200 kg

SikaBiresin® UR620 (B)

Canister

8 kg

Drum200 kg
 

Product Details

Properties

Component A

SikaBiresin® UR404

Component B

SikaBiresin® UR620

Chemical base
Isocyanate prepolymer

Amine

Color

 

mixed

Colorless-transparent

Amber

Amber

Density

 

cured

1.05 kg/l

1.05 kg/l

1.1 kg/l

Mixing ratio

by weight

100 : 40

Viscosity (CQP029-4)

  

mixed

6500 mPa·s

800 mPa·s

5000 mPa·s

Pot life (CQP021-4)

500 g at 23 °C

10 minutes

Demolding time

depending on geometry, earliest after

6 hours

Curing time

at 23 °C

7 days

Shore A hardness (CQP023-1 / ISO 868)

62 A

Tensile strength (CQP036-6 / ISO 527)

7 MPa A

Tear strength (CQP045-1 / ISO 34)

10 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 7 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. 
To achieve the highest performance, leave the elastomeric mold at a temperature ≥ 23 °C for 6 days before using it.

STORAGE CONDITIONS

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