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TAPPI T441 Cobb Test

Testing Standard:

TAPPI T441 Water Absorptiveness of Sized (Non-Bibulous) Paper, Paperboard, and Corrugated Fiberboard (Cobb Test) ie. TAPPI T441 Cobb Test

Standard Number
TAPPI T441

Standard Title
Water Absorptiveness of Sized (Non-Bibulous) Paper, Paperboard, and Corrugated Fiberboard (Cobb Test), Test Method

Overview for TAPPI T441 Cobb Test:

TAPPI T441 Test Method is used to evaluate the materials rate of water absorption and to verify the performance of any coatings and the sizing applied to the paper. Purple Diamond Testing offers TAPPI T441 Water Absorptiveness of Sized (Non-Bibulous) Paper, Paperboard, and Corrugated Fiberboard (Cobb Test) as part of our packaging compliance and validation services.

Rationale for TAPPI T441 Cobb Test:

TAPPI T441 – Water Absorptiveness of Sized (Non-Bibulous) Paper, Paperboard, and Corrugated Fiberboard (Cobb Test). The amount of moisture in paper affects the overall physical strength, porosity, and printability. This method can be ideal when evaluating different surface coatings applied to the material for increased performance in addition to verification of resistance to water absorption requirements, which are common for some regulated packaging. Depending on the material, the test’s duration is between one and thirty minutes and measures the amount of water absorbed by weight.

Key Points:

  • Determines the need for moisture barrier coatings and the sizing of paper
  • Using this test method verifies compliance with UN DOT regulations
  • Utilize this test method to ensure quality control
  • Verifies the amount of surface coating used is sufficient

Related Standards:

  • ASTM D3285 – Test Method for Water Absorptiveness of Non-Bibulous Paper and Paperboard (Cobb Test)
  • ISO 535 – Paper and Board – Determination of Water Absorptiveness – Cobb Method

As always, Purple Diamond offers you the ability to either schedule an initial consultation, complimentary, OR you can book a facility tour and come on in and visit. Definitely feel free to stop in to the lab if you are close to the Lehigh Valley. The packaging and whole Purple Diamond team is here to assist you anyway that we can. The initial consultation can be either a phone call or a zoom call, whatever is more convenient for you. Reach out via the Contact Us page by either filling out the contact us form OR booking some time on the calendar below the contact form. Either way we will get back to you! Thank you so much for reading down this far and thank you for considering Purple Diamond as your dedicated testing, engineering, and design facility for all of your packaging needs.

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