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SikaBiresin® CR135

(formerly Biresin® CR135)

Composites resin system for RTM process with Tg up to 152 °C

SikaBiresin® CR135 is an epoxy resin system suitable for the production of high performance fiber reinforced composites with high surface quality by RTM-process.  

  • Very good surface quality (with specific mold setup)
  • Tg up to 152 °C (depending on curing conditions)
  • Good impregnation of dry fabrics, multi-axials and non-woven fiber preforms
 
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PRODUCT BENEFITS

  • Very good surface quality (with specific mold setup)
  • Tg up to 152 °C (depending on curing conditions)
  • Good impregnation of dry fabrics, multi-axials and non-woven fiber preforms
 

Areas of Application

SikaBiresin® CR135 is especially suited to the RTM process and can be used for the production of automotive and general industrial composites components where very good surface quality and higher thermal resistance is needed. This product is suitable for experienced professional users only. Tests under actual processing conditions and with additional materials such as fibers and release agents must be performed to proof material compatibility.  

Product Details

Typical Product Data
Properties

SikaBiresin® CR135 (A)

SikaBiresin® CH135-4 (B)

Chemical base

Epoxy resin

Amine hardener

Color

Translucent

Colorless to yellowish

Mixing ratio

by weight

by volume

100 : 24

100 : 30

Density

liquid

cured

1.17 g/ml

0.92 g/ml

1.14 g/ml

Viscosity (CQP029-4)

  

mixed

5750 mPa·s

10 mPa·s

940 mPa·s

Pot life (CQP021-3 / Gel Timer TECAM)

160 minutes

Curing conditions

8 hours

140 °C

Tensile strength (CQP036-2 / ISO 527)

72 MPa

Tensile modulus (CQP036-2 / ISO 527)

2850 MPa

Tensile elongation (CQP036-2 / ISO 527)

3.3 %

Flexural strength (CQP027-2 / ISO 178)

134 MPa

Flexural modulus (CQP027-2 / ISO 178)

2900 MPa

Compressive strength (CQP028-5 / ISO 604)

129 MPa

Shore D hardness (CQP023-1 / ISO 868)

87

Impact resistance (CQP038-2 / ISO 179)

27 kJ/m²

Glass transition temperature by DSC (CQP301-5 / ISO 11357)

152 °C

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

150 °C

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

133 °C

Shelf life

24 months

12 months

CQP = Corporate Quality Procedure

Application

Application Information

Application

The injection temperature of the resin system shall be between 50 °C – 70 °C. The mold temperature for an isothermal process shall be between 70 °C – 120 °C and for a variothermal process between 50 °C – 180 °C.
Prior to application, check both components for crystallization. The crystallization process can be reversed by heating the product to 60 °C – 70 °C until the crystals are no longer visible.
Containers must be closed tightly immediately after each use to prevent moisture ingress.

Removal

Uncured SikaBiresin® CR135 can be removed from tools and equipment with Sika® Reinigungsmittel 5 or another suitable solvent. Once cured, the material can only be removed mechanically. Hands and exposed skin shall be washed immediately using industrial hand cleaner and water.
Do not use solvents on skin.

STORAGE CONDITIONS

All components must be stored between 15 °C – 30 °C.

Prior to use check the material for homogeneity and crystallization and make sure to temper it to processing temperature.