TAPPI T441 Cobb Test

Testing Standard:

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

Standard Number
TAPPI T441

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

Overview:

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:

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:

Related Standards:

Accreditations

Achieving ISO 17025 Accreditation is the pinnacle in third-party laboratory testing accreditation. It confirms that the facility has management, quality, and technical systems in place to ensure accurate and reliable analyses.
ISTA is revered as the certification standard for package testing for distribution. ISTA’s Testing Protocol remains a series of testing methodologies and standards well recognized within the packaging community.
A select few companies are authorized by PHMSA as an approved third-party packaging testing laboratory in accordance with Hazardous Materials Regulations, critical to ensuring safe transport of dangerous goods.

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