TAPPI T844 Basis Weight of Corrugated

Testing Standard:

TAPPI T844 Determining Construction (Nominal Basis Weight) of Corrugated Board

Standard Number
TAPPI T844

Standard Title
Determining Construction (Nominal Basis Weight) of Corrugated Board, Test Method

Overview:

TAPPI T844 Test Method is used to verify the grade of corrugated material. This method is ideal when comparing the corrugated material against the manufacturer’s specifications or verifying against previously tested materials. Purple Diamond Testing offers TAPPI T844 Determining Construction (Nominal Basis Weight) of Corrugated Board as part of our packaging compliance and validation services.

Rationale:

TAPPI T844 – Determining Construction (Nominal Basis Weight) of Corrugated Board. This test method is the first step in evaluating corrugated board when managing quality control, verification to specifications, and in predicting the expected strength performance of corrugated materials. The board is soaked in water and the adhesive is removed. The layers of paper are then oven dried and reacclimated to ambient lab conditions before being weighed. In most cases, the basis weight of combined board is specified in pounds per thousand square feet for each component (lbs/MSF). For example, a single wall board would be identified as “42 / 33 / 42” (outer liner, medium, and inner liner).

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.

Affiliations

With over 12,000 standards globally, ASTM International’s fully transparent standards development enhances performance and confidence in consumer choices.
The Technical Association of Pulp and Paper Industry’s peer-reviewed standards improve production through operational methods and industry recognized best practices.

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