SikaBiresin® GC155

Epoxy gelcoat with high temperature resistance

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SikaBiresin® GC155 is a 2-component epoxy gelcoat with high temperature resistance. It is easy to apply by brush or roller.  

  • High heat resistance up to 140 °C
  • Easy to apply (also by roller)
  • Dense surface
 
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Overview

PRODUCT BENEFITS

  • High heat resistance up to 140 °C

  • Easy to apply (also by roller)

  • Dense surface

 

Areas of Application

SikaBiresin® GC155 is designed for the production of large composite molds. It is part of a product system dedicated to mold making (see section Further Information). 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® GC155 (A)

Pail10 kg

SikaBiresin® GC155 (B)

Canister

1.4 kg

 

Product Details

Properties

SikaBiresin® GC155 (A)

SikaBiresin® GC155 (B)

Chemical base

Epoxy resin, filled

Amine, unfilled

Color

 

mixed

Dark grey

Amber

Dark grey

Density

 

cured

1.60 kg/l

0.98 kg/l

1.53 kg/l

Mixing ratio

by weight

100 : 14

Viscosity (CQP029-4 / ISO 3219)

 

mixed

33 000 mPa·s

120 mPa·s

8500 mPa·s

Pot life (CQP021-4)

500 g at 23 °C

4 hours

Shore D hardness (CQP023-1 / ISO 868)

88 A

Flexural modulus (CQP027-2 / ISO 178)

7000 MPa A

Flexural strength (CQP027-2 / ISO 178)

101 MPa A

Tensile strength (CQP036-2 / ISO 527)

56 MPa A

Tensile modulus (CQP036-2 / ISO 527)

6000 MPa A

Elongation at break (CQP036-2 / ISO 527)

1 % A

Impact resistance (CQP038-2 / ISO 179)

10 kJ/m2 A

Compressive strength (CQP028-5 / ISO 604)

143 MPa A

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

135 °C A

Glass transition temperature (CQP301-5 / ISO 11357)

140 °C A

Shelf life

24 months

12 months

CQP = Corporate Quality Procedure

A) curing condition: 160 °C for 8 hours

Application

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

Apply the gelcoat to the mold in a uniform thickness using a flat, short-haired brush or a roller. 
Pre-curing at 60 °C for 4 hours is mandatory before removal of the mold from the plug. Post-curing of the finished part at 160 °C for 8 hours improves the resistance of the gelcoat in respect of temperature, solvents and water.
Note: The post-curing requires a slow temperature increase and decrease process.
Depending on the geometry and weight of the part, it is recommended to use a counterpart (conformer) during post-curing.

STORAGE CONDITIONS

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

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