SikaBiresin® G38

Epoxy casting resin with high heat resistance

SikaBiresin® G38 is a 2-component epoxy casting resin with good flow behavior for manufacturing of heat resistant molds.  

  • Good flow behavior and degassing
  • Casting thickness up to 40 mm
  • Low shrinkage
  • Good mechanical properties also at elevated temperatures
 

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Overview

PRODUCT BENEFITS

  • Good flow behavior and degassing
  • Casting thickness up to 40 mm
  • Low shrinkage
  • Good mechanical properties also at elevated temperatures
 

Areas of Application

SikaBiresin® G38 is designed for manufacturing of heat resistant molds, e.g. vacuum forming molds.
The Product is also used for casting of heat resistant back fillings of foundry patterns.
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® G38 (A)

Pail

10 kg

SikaBiresin® G38 (B)

Box with bottles

6 x 0.7 kg

 

Product Details

Properties

SikaBiresin® G38 (A)

SikaBiresin® G38 (B)

Chemical base

Epoxy resin, filled

Amine, unfilled

Color

 

mixed

Grey

Amber

Grey

Mixing ratio

by weight

100 : 7

Density

 

cured

1.86 kg/l

0.96 kg/l

1.8 kg/l A, B

Viscosity (CQP029-4)

 

mixed

40 000 mPa·s

200 mPa·s

11 000 mPa·s

Pot life (CQP021-4)

500 g at 23 °C

120 minutes

Demolding time

24 hours

Maximum casting thickness

40 mm

Shore D hardness (CQP023-1 / ISO 868)

88 A

90 B

Flexural strength (CQP027-2 / ISO 178)

51 MPa A

68 MPa B

Impact resistance (CQP038-2 / ISO 179)

5 kJ/m2  A

8 kJ/m2 B

Compressive strength (CQP028-5 / ISO 604)

94 MPa A

112 MPa B

Linear shrinkage (CQP014-5)

500 x 40 x 25 mm

0.08 % A

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

54 °C A

126 °C B

Coefficient of thermal expansion (CQP053-1 / ISO 11359)

38 x 10-6 1/K B

Shelf life

18 months

24 months

CQP = Corporate Quality Procedure

A) curing condition: 23 °C for 14 days

B) post curing: 60 °C for 4 hours + 100 °C for 2 hours

Application

Surface preparation

The material, processing and mold or mastermodel 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 properly sealed prior applying the release agent.
Wax-based release agents are recommended. 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.
Further post curing of the demolded part can improve the final mechanical properties.
Depending on the geometry and weight of the part, it is recommended to use a conformer while post curing.

STORAGE CONDITIONS

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