ASTM D6633 Basic Functional Stability of a Mechanical Pump Dispenser

ASTM D6633 package testing determines the basic functional stability of a mechanical pump dispenser with a product. As an ISTA and ISO 17025 certified lab, we realize the importance of functional stability of a mechanical pump dispenser testing. Meeting the ASTM D6633 requirements can be difficult. We understand the challenges and guide companies through the process.

Keystone provides the peace of mind that all of your needs will be met. We also quickly provide comprehensive reports shortly after completion of the testing. Lastly, Keystone Package Testing is proud to offer competitive pricing and volume discounts.

Request a quote to see why so many companies partner with Keystone Package Testing. Contact us to receive more information on Mechanical Pump Dispenser testing.

Summary of ASTM Basic Functional Stability Testing Information

The mechanical pump dispensers (spray or flow type) are tested at accelerated usage elevations. To begin ASTM D6633 testing, appropriate apparatuses and test specimens must be obtained.


  • 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

Scope of ASTM Basic Functional Stability of a Mechanical Pump Dispenser

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 specimens 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.

Significance of ASTM D6633 Package Testing

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).

Expert ASTM D6633 Mechanical Pump Dispenser Package Testing

Keystone can accommodate a range of flexible and rigid packages of all sizes, including large pallets. Our team strives to give our customers more time and energy on product development instead of testing. In addition to mechanical pump dispenser testing, Keystone has a full scope of expertise including temperature validation, drop, and high impact shock.

Our package testing engineers are experienced and have thorough knowledge of industry standards. They are prepared to guide you through the transit testing process. Let’s get started! Request a quote or contact us at (724) 657-9940.


For more referenced ASTM standards and similar testing, please follow the links below: