Biresin® CR83 is an epoxy resin system with extremely low viscosity designed specifi cally for the infusion process for the production of high performance fiber reinforced composites parts and molds. The system has thermal properties up to 80°C. Biresin® CR83 epoxy resin has a low tendency to crystallize.

Polymer Name: Epoxy Resins & Compounds

Chemical Family: Epoxy & Epoxy Derivatives

Processing Methods: Reinforced Reaction Injection Molding (RRIM), Resin Transfer Molding (RTM), Vacuum Infusion Processing (VIP)

End Uses: Tanks

Technical Data Sheet

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Identification & Functionality

Composite Materials Functions

Features & Benefits

Product Highlights
  • 3 hardeners (B) give a wide range of processing times
  • The reactivity can be adapted by mixing the hardeners
  • Fast infusion and good wet-out of fabrics and non-wovens due to low viscosity and good wetting characteristics even at low temperatures
  • All systems Germanischer Lloyd approved, Certifi cate No. WP 1420017 HH (attached)
  • Glass transition temperatures up to 80°C dependent on curing conditions
  • Carbon fi bres are wet out well by all of the resin systems
  • Biresin® CR83 resin (A) has a low tendency to crystallize

Applications & Uses

Composites End Use
Application

Biresin® CR83 is especially suited to the infusion and injection processes due to its low viscosity range. It can be used in the marine and general industrial composite areas. Due to its good wetting properties it is particularly suited for use with carbon fi bre reinforcement.

Processing
  • The material and processing temperatures should be in the range 18 - 35°C.
  • The mixing ratio must be followed accurately to obtain best results. Deviating from the correct mix ratio will lead to lower performance.
  • The final mechanical and thermal values are dependent on the applied postcuring cycles.
  • It is recommended to clean brushes or tools immediately after use with Sika Reinigungsmittel 5.
  • Additional information is available in “Processing Instructions for Composite Resins”.

Properties

Typical Properties
ValueUnitsTest Method / Conditions
Mixing Ratio, parts by Weight100
Mixing Ratio, parts by Volume100
Density at 25°C1.14g/ml
Viscosity at 25°C~610mPa.s

Technical Details & Test Data

Postcuring

The suitable cure cycle and the attainable mechanical and thermal values depend on various factors, such as laminate thickness, fi bre volume, reactivity of the resin system etc.
An appropriate cure cycle could look as follows:

  • Heat-up rate of ca. 0.2°C/Minute until approx. 10°C below the required glass transition temperature (Tg)
  • Followed by a dwell at that temperature of between 2 and 12 hours.
  • Part(s) should then be cooled at ~0.5°C per minute

The specifi c postcure should be adapted to the required technical and economic requirements. To measure the mechanical performance of the resin system a SikaAxson standard cycle is used to ensure that the full Tg potential of the system in question is reached.

Storage & Handling

Storage
  • Minimum shelf life of Biresin® CR83 resin (A) is 24 month and of Biresin® CH83-2, CH83-6 and CH83-10 hardeners (B) is 12 month under room conditions (18 - 25°C), when stored in original unopened containers.
  • The tendency to of crystallize with this system is very low. However, if crystallization of the resin (A) component appears, it can be easily removed by warming up the resin for a suffi cient time to at least 60°C.
  • Containers must be closed tightly immediately after use. The residual material needs to be used up as soon as possible.