SikaBiresin® F38

Unfilled fastcast resin to produce thin parts

SikaBiresin® F38 is a room temperature fast curing 2-component polyurethane system to produce thin parts.  

  • Good impact resistance
  • Short demolding time
  • Low viscosity
  • Thermoplastic aspect
  • Low shrinkage
  • User friendly mixing ratio
  • Can be painted
 
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PRODUCT BENEFITS

  • Good impact resistance
  • Short demolding time
  • Low viscosity
  • Thermoplastic aspect
  • Low shrinkage
  • User friendly mixing ratio
  • Can be painted
 

Areas of Application

SikaBiresin® F38 is designed for the manufacturing in series of toys, figurines, reduced scale models and miniatures. This product is suitable for experienced professional users only.  

Packaging

   

SikaBiresin® F38 (A)

Can

5 kg

SikaBiresin® F38 (B)

Can

5 kg

 

Product Details

Typical Product Data
Properties

SikaBiresin® F38 (A)

SikaBiresin® F38 (B)

Chemical base

Polyol, unfilled

MDI-based isocyanate, unfilled

Color

 

mixed

Transparent

Amber

Off-white

Density

  

cured

0.98 kg/l

1.16 kg/l

1.07 kg/l A

Mixing ratio

by weight

by volume

100 : 100

100 : 85

Viscosity (CQP029-4)

 

mixed

35 mPa·s

40 mPa·s

35 mPa·s

Pot life (CQP021-4)

200 g

2 minutes

Demolding time

25 minutes

Curing time

at 23 °C

3 days

Maximum casting thickness

10 mm

Shore D hardness (CQP023-1 / ISO 868)

70 A

Tensile strength (CQP036-2 / ISO 527)

28 MPa A

Elongation at break (CQP036-2 / ISO 527)

10 % A

Compressive strength (CQP028-5 / ISO 604)

20 MPa A

Flexural strength (CQP027-2 / ISO 178)

32 MPa A

Flexural modulus (CQP027-2 / ISO 178)

750 MPa A

Impact resistance (CQP038-2 / ISO 179)

30 kJ/m2 A

Linear shrinkage (CQP014-5)

3 mm thickness

1.5 mm/m A

Heat deflection temperature (CQP030-1 / ISO 75B)

55 °C A

Service temperature

20 °C – 60 °C A

Shelf life

12 months

CQP = Corporate Quality Procedure

A) values after post 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® F38 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.