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casting failures (surface roughness (DUE TO: (too high temp of alloy,…

- - - - lack of molten metal due to:
        
        sprue diameter too small
        
        investment not sufficiently heated
    - - too rapid solidification
        
        mould too cold
        
        alloy near liquidus temp
    - - too rapid flow at high temp
  - - - insufficient casting pressue
      - dense investment
      - wax placed too far from open end
      - clogging of mould by residual carbon when low heat technique used