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The tables below show the recommended resin to fibreglass ratios and catalyst ratios for polyester resin systems. These are general guidelines and may vary based on specific materials and applications. Always refer to the manufacturer's recommendations for the best results.
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Calculate by Area Calculate by Dimensions Calculate a Rectangle MouldResin to Fibreglass Ratios
| Material (Kevlar/Carbon Fibre?) | Resin Per Sq Meter | Thickness |
|---|---|---|
| 300g (1oz) Chop Strand Mat | 650g | 0.5mm |
| 450g (1oz) Chop Strand Mat | 1.0 kg | 0.75mm |
| 600g (2oz) Chop Strand Mat | 1.4 kg | 1.0mm |
| 900g (1oz) Chop Strand Mat | 2.0 kg | 1.5mm |
| 125g Plain weave Glass cloth | 150g | 0.25mm |
| 200g Plain weave Glass cloth | 250g | 0.5mm |
| 300g Woven Roving | 300g | 0.25mm |
| 600g Woven Roving | 600g | 0.5mm |
| 800g Woven Roving | 800g | 0.75mm |
| 600/300 Combination Matt | 1.2 kg | 0.75mm |
| 800/450 Combination Matt | 1.7 kg | 1.0mm |
| 600g Biaxial Glassfibre | 700g | 0.5mm |
| 800g Biaxial Glassfibre | 900g | 0.75mm |
| Gel Coat | 600g | 0.5mm |
Catalyst Ratios
| Temperature | 5°C to 13°C | 13°C to 16°C | 16°C to 20°C | 20°C to 25°C |
| % Catalyst to Resin | 4% | 3% | 2% | 1% |
| Catalyst Amounts for Common Resin Quantities |
(Using the above % Catalyst to Resin) | |||
| 100g | 4ml | 3ml | 2ml | 1ml |
| 500g | 20ml | 15ml | 10ml | 5ml |
| 1.0 kg | 40ml | 30ml | 20ml | 10ml |
| 1.5 kg | 60ml | 45ml | 30ml | 15ml |
| 2.0 kg | 80ml | 60ml | 40ml | 20ml |
| 2.5 kg | 100ml | 75ml | 50ml | 25ml |
| 3.0 kg | 120ml | 90ml | 60ml | 30ml |
| 3.5 kg | 140ml | 105ml | 70ml | 35ml |
| 4.0 kg | 160ml | 120ml | 80ml | 40ml |
| 4.5 kg | 180ml | 135ml | 90ml | 45ml |
| 5.0 kg | 200ml | 150ml | 100ml | 50ml |