PQ – Measuring abnormal wear particles

%name PQ   Measuring abnormal wear particles PQ – this is a non-dimensional value indicating the amount of ferrous (i.e. Iron, Steel, Cobalt or Nickel – magnetic) material in the sample. Standard Iron results are performed by ICP (Inductively coupled plasma) and measures particles ideally less than 5 to 10µm. By comparison the width of a human hair is 80µm. Therefore large ferrous particles that can be seen by eye will be underestimated by ICP. Hence the PQ method detects small and large particles.

Common Causes Potential Result Potential advice
High PQ result compared to Iron ICP result

Abnormal wear processes:

  • Abrasive contaminants
  • Misalignment
  • Overloading
  • Poor lubrication
  • And many more.
  • Machine failure
  • Reduced component life
  • Loss of production.
  • Further investigation of oil/filter by laser net fines or ferrography to determine cause.

word image 1 PQ   Measuring abnormal wear particles

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