SikaBiresin® UR409

Flexible elastomeric casting resin for ultrasonic welding fixtures

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SikaBiresin® UR409 is a 2-component flexible polyurethane elastomeric casting resin for ultrasonic welding fixtures.  

  • Insensitive to moisture
  • Good tear strength
  • High elasticity
  • Good low temperature flexibility
 
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Overview

PRODUCT BENEFITS

  • Insensitive to moisture

  • Good tear strength

  • High elasticity

  • Good low temperature flexibility

 

Areas of Application

SikaBiresin® UR409 is designed for casting of flexible fixtures for parts for ultra sonic welding. The Product is also well suited for manufacturing of elastic, flexible molds, moldings and components. 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® UR409 (A)

Pail

10 kg

SikaBiresin® UR409 (B)

Canister

10 kg

 

Product Details

Properties

SikaBiresin® UR409 (A)

SikaBiresin® UR409 (B)

Chemical base

Amine, unfilled

Isocyanate prepolymer, unfilled

Color

 

mixed

Beige

Yellowish-transparent

Beige

Density

 

cured

1.09 kg/l

1.09 kg/l

1.10 kg/l

Mixing ratio

by weight

100 : 100

Viscosity (CQP029-4)

 

mixed

1400 mPa·s

4000 mPa·s

2500 mPa·s

Pot life (CQP021-4)

500 g at 23 °C

30 minutes

Demolding time

16 hours

Curing time

at 23 °C

7 days

Shore A hardness (CQP023-1 / ISO 868)

92 A

Tensile strength (CQP036-6 / ISO 527)

12 MPa A

Tear strength (CQP045-1 / ISO 34)

50 N/mm A

Elongation at break (CQP036-6 / ISO 527)

650 % 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.
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.
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.