Is Your Blasting Air Clean?

To obtain a clean surface, the compressed air must be clean

blast check blotter paperOne of the main reasons for blast cleaning is to remove surface contaminants, rust, old paint etc. to ensure a good coating adhesion to the substrate is achieved. To obtain a clean surface, the compressed air must be clean. If it’s not, blast cleaning will introduce new contaminants onto the substrate as you blast.

Contaminants to Check in the Blast Air

  • Dirt
  • Oil (mist or droplets)
  • Moisture (mist or droplets)

Recommended Check Intervals

When testing for air cleanliness make sure to run the test before commencement of blasting and then again in intervals of 4 hours of continual blasting.

7 Simple Steps to Test Blasting Air

  1. Ensure appropriate safety precautions are in place – safety goggles etc.
  2. Set up the blast equipment and start-up the compressor.
  3. Secure the test paper apparatus.
  4. When the compressor is warmed up, start the blast equipment running with NO abrasive in the air stream.
  5. Position the nozzle so it is firing at the center and within 600mm of the test sheet.
  6. Continue the test for 2 minutes.
  7. Shut off the air supply and quickly check the test paper for any visual sign, feel or smell of oil, moisture or other contaminants.