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SikaBiresin® F21

Filled fastcast resin with very good workability

SikaBiresin® F21 is a filled fast curing 2-component polyurethane system with very good workability.  

  • Very good flow behavior
  • Easy to mix by hand
  • Short demolding time and low shrinkage
  • Almost odorless
  • Very fine structure
  • Very good mechanically workable
 
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PRODUCT BENEFITS

  • Very good flow behavior

  • Easy to mix by hand

  • Short demolding time and low shrinkage

  • Almost odorless

  • Very fine structure

  • Very good mechanically workable

 

Areas of Application

SikaBiresin® F21 is designed for casting of master and core models, negatives and moldings of medium size.
This product is suitable for experienced professional users only.  

Packaging

   

SikaBiresin® F21 (A)

Box with tins

6 x 1 kg

Can8 kg
Hobbock25 kg

SikaBiresin® F21 (B)

Box with bottles

6 x 0.15 kg

Can

1.2 kg

3.75 kg

 

Product Details

Typical Product Data
Properties

SikaBiresin® F21 (A)

SikaBiresin® F21 (B)

Chemical base

Polyol, filled

MDI-based isocyanate, unfilled

Color

 

mixed

Light grey, black

Brown-transparent

Light grey, black

Density

 

cured

1.74 kg/l

1.23 kg/l

1.7 kg/l

Mixing ratio

by weight

100 : 15

Viscosity (CQP029-4)

 

mixed

2500 mPa·s

40 mPa·s

2100 mPa·s

Pot life (CQP021-4)

200 g

5 minutes 30 seconds

Demolding time

30 minutes

Curing time

at 23 °C

3 days

Shore D hardness (CQP023-1 / ISO 868)

80 A

Compressive strength (CQP028-5 / ISO 604)

75 MPa A

Flexural strength (CQP027-2 / ISO 178)

35 MPa A

Flexural modulus (CQP027-2 / ISO 178)

2500 MPa A

Impact resistance (CQP038-2 / ISO 179)

5 kJ/m2 A

Linear shrinkage (CQP014-5)

500 x 25 x 20 mm

0.18 % A

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

80 °C A

Shelf life

12 months

CQP = Corporate Quality Procedure

A) curing condition: 23 °C for 7 days

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.

STORAGE CONDITIONS

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