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    Fibreglass work: Estimating quantities

    Fibreglass work: Estimating quantities
    Eastcoast Fibreglass Catalyst addition chart
    % of catalyst to resin 4% Catalyst 3% Catalvst 2% Catalyst 1% catalyst
    Temperature 5 - 13°C 13 - 16°C 16 - 20°C 20 - 35°C
    500g 20ml 15ml 10ml 5ml
    1 kg 40ml 30ml 20ml 10ml
    2kg 80ml 60ml 40ml 20ml
    3kg 120ml 90ml 60ml 30ml
    4kg 160ml 120ml 80ml 40ml
    5kg 200ml 150ml 100ml 50ml
    6kg 240ml 180ml 120ml 60ml
    7kg 280ml 210ml 140ml 70ml
    8kg 320ml 240ml 160ml 80ml
    9kg 360ml 270ml 180ml 90ml
    10kg 400ml 300ml 200ml 100ml
    The provided guidelines are based on the Medium reactivity catalyst Butanox M50. However, it is essential to refer to the Technical data sheet specific to your Resin before use. The above chart serves as a general guide and may not account for all variations and specific requirements of different resins.
    Do's and don'ts
    1. Accurately measure the catalyst and thoroughly stir it into the Resin, ensuring you wear appropriate personal protective equipment (PPE).
    2. Ideally, use a Catalyst dispenser for precise measurement.
    3. Adding the catalyst initiates the curing process of the resin, and the reaction rate depends on the specific resin and catalyst activity.
    4. Avoid mixing more resin than you can practically use; work with smaller, more manageable quantities if necessary. Unused resin will cure, leading to an exothermic reaction. If you have leftover resin, move it to a safe outdoor area and fill the container with cold water. In an unfilled casting, this reaction can generate temperatures over 150 degrees Celsius, while in the laminate, it will be considerably lower.
    5. As soon as the resin begins to thicken to a jelly-like consistency, cease laminating and promptly clean your tools and immediate work area.
    6. When using Gelcoats, always use a 2% catalyst.
    7. If adding pigment, do so before adding the catalyst, ensuring thorough stirring and mixing. Be cautious not to under or over pigment the mixture.

    Please note that the guidelines provided for estimating Resin to Fibreglass ratios are approximations and intended as general guidelines only. Variations in laminate complexity and mould surface may slightly alter the quantities required.


       Material                                             Resin

    300g (1oz) CSM                               650g Resin per m2

    450g (1 ½ oz) CSM                          1kg  Resin per m2

    600g (2oz) CSM                               1.4kg Resin per m2

    900g (1oz) CSM                               2 kg Resin per m2

    125g Plain weave Glass cloth          150g Resin per m2

    200g Plain weave Glass cloth          250g Resin per m2

    300g Woven Roving                         300g Resin per m2

    600g Woven Roving                         600g Resin per m2

    800g Woven Roving                         800g Resin per m2

    600/300 Combination Matt           1.2 kg Resin per m2

    800/450 Combination Matt           1.7 Kg Resin per m2

    450g Biaxial Glassfibre                 500g Resin per m2

    600g Biaxial Glassfibre                 700g Resin per m2

    800g Biaxial Glassfibre                 900g Resin per m2

    200g Carbon Fibre                        300g Resin per m2

    375g Carbon Fibre                        550g Resin per m2

    650g Carbon Fibre                        950g Resin per m2

    180g Kevlar/Aramid                      270g resin per m2

    300g Kevlar/Aramid                  450g resin per m2