SikaBiresin® GC115

Epoxy gelcoat with very good chemical and heat resistance

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SikaBiresin® GC115 is a 2-component epoxy gelcoat with very good chemical and heat resistance for manufacturing of polyester and foam models.  

  • Very good chemical and heat resistance
  • Good mechanical resistance
  • Easy application and good spreadability
 
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Overview

PRODUCT BENEFITS

  • Very good chemical and heat resistance

  • Good mechanical resistance

  • Easy application and good spreadability

 

Areas of Application

SikaBiresin® GC115 is designed for the manufacture of polyester and foam models.
The Product is also suitable for producing gauges, moulds, foundry patterns, and laminated structures. 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® GC115 (A)

Pail

5 kg

SikaBiresin® GC05 (B)

Box with bottles

6 x 0.35 kg

 

Product Details

Properties

Component A

SikaBiresin® GC115

Component B

SikaBiresin® GC05

Chemical base
Epoxy resin, filled Amine, unfilled

Color

 

mixed

Green

Amber

Green

Density

 

cured

1.58 kg/l

0.99 kg/l

1.55 kg/l

Mixing ratio

by weight

100 : 7

Viscosity (CQP029-4 / ISO 3219)

 

mixed

30 000 mPa·s

90 mPa·s

16 000 mPa·s

Pot life (CQP021-4)

200 g at 23 °C

40 minutes

Tack free time (CQP019-3)

at 23 °C

70 minutes

Demolding time

earliest after

16 hours

Shore D hardness (CQP023-1 / ISO 868)

88 A

Flexural modulus (CQP027-2 / ISO 178)

7100 MPa A

Flexural strength (CQP027-2 / ISO 178)

89 MPa A

Impact resistance (CQP038-2 / ISO 179)

7 kJ/m2 A

Compressive strength (CQP028-5 / ISO 604)

120 MPa A

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

103 °C A

Shelf life

12 months

CQP = Corporate Quality Procedure

A) curing condition: 80 °C for 2 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. The material must be applied in a uniform direction to produce a homogeneous, gap-free surface layer.
A coupling layer or other backfill layer shall be applied as close as possible to the tacky phase to ensure proper adhesion and prevent bonding issues. Tack-free time depends on application thickness, room and mold temperature.
Post-curing of the finished part at 80 °C for 2 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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