Technical training
Blade Repair Standard / V4 2023-05-02
Share their understanding of:
a. the function of the matrix material, and how air voids and dry fibres can lead to failure of the laminate structure
b. how the fibre content can affect the properties of the laminate
ELEMENT 17.5 - MIXING RATIO
Learning objectives:
146) The participants can explain the term ‘mixing ratio’ (Knowledge, intermediate level)
147) The participants can explain how the incorrect mixing ratio of a multi-component material will affect the properties of the cured material (Knowledge, intermediate level) 148) The participants can explain where to find the mixing ratio for a given material (Knowledge, intermediate level) 149) The participants can describe the chemical reaction between the base resin and hardener in epoxy, polyester, and polyurethane materials (Knowledge, basic level)
The instructor shall:
Recap on the terms ‘mixing ratio’, ‘two components’ and ‘three components’ materials, ‘base resin’, ‘hardener’ and ‘accelerator’ Describe the chemical reaction between the base resin and hardener in epoxy, polyester, vinyl ester and polyurethane materials
Explain:
a. where to find the mixing ratio for blade repair chemicals from the manufacturer technical data sheet (TDS) b. how the TDS must be cross referenced with a blade manufacturer specific work instruction relating to mixing and curing materials c. how care must be taken to ensure that the correct mixing ratio is used, as these are given in the TDS by weight and volume d. how incorrect mixing ratios will affect the cured product, with a focus on the implications to health and safety of sanding in unreacted materials
e. why it is important to calculate the mixing ratio for each batch of chemicals that is being mixed
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