ASTM D6633 Standard Practice for Basic Functional Stability of a Mechanical Pump Dispenser

The scope of ASTM D6633 is to determine the basic functional stability of a mechanical pump dispenser with a product. The mechanical pump dispensers (spray or flow type) are tested at accelerated usage elevations.

To begin ASTM D6633 testing, appropriate apparatuses and test specimen must be obtained.

Apparatus:

  • Containers- The containers must be able to hold the product at various environmental conditions for a period of time predetermined. The mechanical pump dispensers will also be affixed to the containers.
  • Product- The appropriate number of products will be required to fill the containers.
  • Balance- A top loading or analytical style balance with direct reading to 0.01g is recommended.
  • Environments- The mechanical pump dispenser and product will be kept in specific environments during testing
    • Ambient Area- maintained at 23 +/- 3°C (73 +/- 5.4°F)
    • Oven (45°C)- maintained at 45 +/- 3°C (113 +/- 5.4°F)
    • Cycle Chamber (optional)- alternating 5 to 50°C (41 to 122°F) every 24 hours
  • Oven Safe Tray- absorbent paper towels laid out
  • Food Coloring or Dye (optional)

Test Specimen:

  • Clean, dry, unused mechanical pump dispensers
  • Conditioned at 23 +/- 3°C (73 +/- 5.4°F) for no less than 4 hours
  • Assemble test pumps at least 24 hours in advance of testing
  • Minimum of twelve (12) mechanical pump dispensers with product and containers to be used for testing
  • Mechanical pump dispensers attached to containers at the minimum recommended torque load
  • Label the units according to D6633 standard procedure

ASTM D6633 testing begins by testing each mechanical pump dispenser for strokes to prime. Next, test for output per stroke and make sure that there are no obstructions present. All the test specimens are to be placed in their designated environment (designated by labels). They must be placed in a specific position except for trigger sprayers. They should all be stored with any protective devices in place and locking features in the locked position. With the exception of trigger sprayers, all the test specimen should be removed from their environments three (3) times per week for four (4) weeks. This totals twelve (12) test days. Trigger sprayers should be removed from their environments once every two (2) weeks over a twelve (12) week period for a total of seven (7) test days. The test specimens should be removed prior to actual evaluations with enough time for their temperature to equilibrate to ambient temperature which generally takes between 4 and 6 hours.

The mechanical pump dispensers will be evaluated for the following:

  • Leakage- there should not be much visible leakage of the product present on the mechanical pump dispenser or the container, if there is a high degree of leakage discontinue testing of that sample
  • Retention of Prime- each mechanical pump dispenser should be stroked to determine if it has lost any prime. If it has lost prime and cannot be reprimed, discontinue testing of that sample
  • Clogging- the opening of the dispenser should be visually inspected for presence of the product (can be in a dried state). If the dispenser is clogged in a way that interferes with performance try to remove the clog. If removal does not remedy the performance problem then discontinue testing of that sample.
  • Output per Stroke- determine the output per stroke of each mechanical pump dispenser
  • Spray Quality- observe spray quality for any leakage

At the conclusion of testing, a comprehensive report will be written in accordance with the guidelines of ASTM D6633. The report will include specific details about the testing parameters. It will also be complete with any information pertaining to discontinued testing samples (if applicable).

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