SikaBiresin® F31

Unfilled fastcast resin to produce thin parts

SikaBiresin® F31 is a room temperature fast curing 2-component polyurethane system to produce thin parts.  

  • Very quick setting
  • User friendly mixing ratio
  • Low aggressiveness to silicone molds
  • Opaque even in small thickness
  • Can be painted
 
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PRODUCT BENEFITS

  • Very quick setting
  • User friendly mixing ratio
  • Low aggressiveness to silicone molds
  • Opaque even in small thickness
  • Can be painted
 

Areas of Application

SikaBiresin® F31 is designed for manufacturing in series of toys, figurines, reduced scale models and miniatures. This product is suitable for experienced professional users only.  

Packaging

  

SikaBiresin® F31 (A)

Box with bottles

6 x 0.9 kg

Can

5 kg

20 kg

SikaBiresin® F31 (B)

Box with bottles

6 x 0.9 kg

Can

5 kg

20 kg

 

Product Details

Typical Product Data
Properties

SikaBiresin® F31 (A)

SikaBiresin® F31 (B)

Chemical base

Polyol, unfilled

MDI-based isocyanate, unfilled

Color

 

mixed

Off-white

Dark amber

Beige

Density

  

cured

0.97 kg/l

1.10 kg/l

1.07 kg/l A

Mixing ratio

by weight

by volume

100 : 100

100 : 88

Viscosity (CQP029-4)

 

mixed

55 mPa·s

24 mPa·s

40 mPa·s

Pot life (CQP021-4)

200 g

1 minute 50 seconds

Demolding time

2 mm thickness

20 minutes

Curing time

at 23 °C

3 days

Maximum casting thickness

5 mm

Shore D hardness (CQP023-1 / ISO 868)

73 A

Flexural strength (CQP027-2 / ISO 178)

44 MPa A

Flexural modulus (CQP027-2 / ISO 178)

1100 MPa A

Impact resistance (CQP038-2 / ISO 179)

16 kJ/m2 A

Glass transition temperature TMA (CQP053-1 / ISO 11359)

95 °C A

Service temperature

20 °C – 80 °C A

Shelf life

12 months

CQP = Corporate Quality Procedure

A) values after curing 7 days at 23 °C

Application

Application Information

Surface preparation

The material, processing and mold or master-model temperature shall be between 18 °C and 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.

With SikaBiresin® F31 it is recommended using SikaBiresin® SI125 (silicone) for molds.

STORAGE CONDITIONS

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