SikaBiresin® GC080

Epoxy gelcoat with very good chemical resistance

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SikaBiresin® GC080 is a 2-component epoxy gelcoat with very good chemical resistance for mold manufacturing.
SikaBiresin® GC080 is also available with hardener SikaBiresin® GC14 for longer pot life.  

  • Very good chemical resistance
  • Easy to apply
  • Sandable and polishable
  • Applicable on wet plaster
 
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Overview

PRODUCT BENEFITS

  • Very good chemical resistance

  • Easy to apply

  • Sandable and polishable

  • Applicable on wet plaster

 

Areas of Application

SikaBiresin® GC080 is designed for manufacturing of molds with very good chemical resistance. The Product is well suited for production of ceramic and plaster molds as well as RTM molds. 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® GC080 blue (A)

Box with tins

12 x 0.5 kg

Pail5 kg

SikaBiresin® GC080 white (A)

Pail

5 kg

10 kg

SikaBiresin® GC11 (B)

Box with bottles12 x 0.05 kg

Bottle

0.5 kg

Canister9 kg
 

Product Details

Properties

Component A

SikaBiresin® GC080

Component B

SikaBiresin® GC11

Chemical base

Epoxy resin, filled

Amine, unfilled

Color

 

mixed

Blue, white

Amber

Blue, white

Density

 

cured

1.78 kg/l

1.08 kg/l

1.73 kg/l

Mixing ratio

by weight

100 : 10

Viscosity (CQP029-4 / ISO 3219)

 

mixed

52 000 mPa·s

1400 mPa·s

41 000 mPa·s

Pot life (CQP021-4)

165 g at 23 °C

12 minutes

Tack free time (CQP019-3)

at 23 °C

40 minutes

Shore D hardness (CQP023-1 / ISO 868)

91 A

Flexural modulus (CQP027-2 / ISO 178)

5200 MPa A

Flexural strength (CQP027-2 / ISO 178)

74 MPa A

Glass transition temperature (CQP053-1 / ISO 11359)

23 °C for 48 h

80 °C for 16 h

53 °C

100 °C

Shelf life

24 months

CQP = Corporate Quality Procedure

A) curing condition: 23 °C for 24 h + 80 °C for 16 h

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 improves the resistance of the gelcoat in respect of temperature, solvents and water.
The duration of the post-curing process depends on the mass and thickness of the finished part.
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.