Tooling & Composites Product Data Sheet Version 05 / 2017 Product Description Biresin® CR120 is a low viscosity epoxy resin system suitable for the production of high performance fibre reinforced composites with thermal performance up to 120°C Application Areas Biresin® CR120 is especially suited to the infusion and injection processes due to its low viscosity range. It can be used in the production of general industrial composites as well as in the production of composite tooling by infusion where higher temperature performance is needed Features / Advantages ■i Fast infusion and good wet-out of fabrics and non-wovens due to low viscosity and good wetting characteristics ■i All systems Germanischer Lloyd approved. Certificate No. WP 1620034 HH (attached) ■ Glass transition temperatures of up to 120°C depending on curing conditions ■ 2 hardeners (B) give a range of processing times ■ Uniform mixing ratio of 100:30 gives processing flexibility ■ The reactivity can be adapted by mixing the hardeners 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”.

Development of Exotherm of Biresin ® CR120 Resin (A)-Hardener (B) Mixtures, 100g / 23°C, insulated, Development of Viscosity of Biresin ® CR120 Resin (A)-Hardener (B) Mixtures, 25

The test specimens were produced from 3 mm thick pure resin. Before the above postcuring, the samples were cured for 7 days at 23°C. When curing a composite part, the whole of the part (including the very middle of the laminate) needs to see the cure temperature. BUILDING TRUST

Postcuring The suitable cure cycle and the attainable mechanical and thermal values depend on various factors, such as laminate thickness, fibre 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 specific postcure should be adapted to the required technical and economic requirements. To measure the mechanical performance...

Statement of Approval Approval No. WP 1620034 HH The material described below complies with the applicable requirements as given in the Rules and Regulations of GL. On this basis the material is for the construction of components provided that the recommendations for use as specified by the producer are observed. Type Biresin CR120 ■ Series Normative Reference GL Rules for Classification and Construction, II - Material and Welding Technology Part 2 Non-Metallic Materials This document consists of this page and a one-page annex which is integral part of the approval. This Statement of Approval...

Statement of Approval ANNEX Approval No. Reference Documents Technical specifications deposited at DNV GL SE, Hamburg.