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SikaBiresin® UR390

Elastomeric casting resin with good abrasion resistance

SikaBiresin® UR390 is a 2-component polyurethane elastomeric casting resin with good abrasion resistance for production of flexible molds for foundry tools.  

  • Good abrasion resistance
  • Good shock resistance
  • Quick hardening
  • Low toxicity
 
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PRODUCT BENEFITS

  • Good abrasion resistance

  • Good shock resistance

  • Quick hardening

  • Low toxicity

 

Areas of Application

SikaBiresin® UR390 is designed for casting of flexible molds for foundry tools (patterns, core boxes) on aluminium pre-forms, concrete resin etc. It is well suited for manufacturing of impact and abrasion resistant parts. 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® UR390 (A)

Box with bottles

6 x 1 kg

Canister5 kg

SikaBiresin® UR390 (B)

Box with tins

6 x 0.5 kg

Canister2.5 kg
 

Product Details

Typical Product Data
Properties

SikaBiresin® UR390 (A)

SikaBiresin® UR390 (B)

Chemical base

Isocyanate

Polyol

Color

 

mixed

White

Amber to dark amber

Beige to dark beige

Density

 

cured

1.08 kg/l

1.08 kg/l

1.08 kg/l

Mixing ratio

by weight, volume

100 : 50

Viscosity (CQP029-4)

 

mixed

3000 mPa·s

150 mPa·s

1500 mPa·s

Pot life (CQP021-4)

150 g at 23 °C

14 minutes

Demolding time

at 23 °C / 80 °C

16 hours / 4 hours

Recommended casting thickness

max. 20 mm

Curing time

at 23 °C

at 80 °C, after gelification

6 days

8 hours

Shore D hardness (CQP023-1 / ISO 868)

D1 / D15

67 A / 64 A

Flexural modulus (CQP027-2 / ISO 178)

450 MPa A

Flexural strength (CQP027-2 / ISO 178)

28 MPa A

Tensile modulus (CQP036-6 / ISO 527)

530 MPa A

Tensile strength (CQP036-6 / ISO 527)

27 MPa A

Tear strength (CQP045-1 / ISO 34)

94 kN/m A

Elongation at break (CQP036-6 / ISO 527)

120 % A

BASHORE resilience (ASTM 2632)

62 % A

Impact resistance (CQP038-2 / ISO 179)

no break A

Linear shrinkage (CQP014-5)

250 x 50 x 3 mm

5 mm/m A

Abrasion resistance (Taber) (ISO 5470)

54 mg/100U A

Glass transition temperature (CQP301-5 / ISO 11357)

100 °C A

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

0 – 40 °C

140 x 10-6 1/K A

Service temperature

-40 – 80 °C

Shelf life

12 months

CQP = Corporate Quality Procedure

A) curing condition: 16 hours for 70 °C

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.
To improve adhesion to aluminum surfaces, it is recommended to use Sika® Activator-205.
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.

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