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 of TAPPI T844 Basis Weight of Corrugated:
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.
BOARD (MICROGRAMS PER SQUARE METRE)
TAPPI T844 is a standard test method developed by the Technical Association of the Pulp and Paper Industry (TAPPI) to determine the basis weight of corrugated board, expressed in micrograms per square meter (µg/m²). Basis weight is the weight of a paper or paperboard per unit area, and is usually expressed in pounds per ream (500 sheets). However, for corrugated board, which is a composite material made up of multiple layers of paper and adhesive, the basis weight is usually expressed in micrograms per square meter. To determine the basis weight of corrugated board according to TAPPI T844, a sample is cut to a specified size and weighed. The dimensions of the sample depend on the type of corrugated board being tested. The sample is then conditioned to a specified relative humidity and temperature to ensure accuracy of the test.
Next, the sample is placed on a flat surface and an area of 100 square centimeters is marked off. The sample is then placed on a balance and the weight is recorded. The basis weight is then calculated using the following formula: Basis weight (µg/m²) = weight of sample (grams) / (area of sample in square meters x 10)
TAPPI T844 is a widely recognized and accepted method for determining the basis weight of corrugated board and is used by paper and packaging manufacturers and quality control agencies worldwide. Purple Diamond Testing offers TAPPI T844 Determining Construction (Nominal Basis Weight) of Corrugated Board as part of our packaging compliance and validation services.
Rationale of TAPPI T844 Basis Weight of Corrugated:
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 part (lbs./MSF). For example, a single wall board would be identified as “42 / 33 / 42” (outer liner, medium, and inner liner).
Key Points:
- Correlates to other paper characteristics such as TAPPI T403 for bursting strength
- Crucial when designing corrugated packaging
- Utilize this test method to ensure quality control
Related Standards:
- ISO 536 – Paper and Board – Determination of Grammage
- TAPPI T410 – Grammage of Paper and Paperboard (Weight Per Unit Area)
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.
Related Testing Standards
- ASTM D642
- ASTM D685
- ASTM D880
- ASTM D951
- ASTM D999
- ASTM D3078
- ASTM D3103
- ASTM D3285
- ASTM D4169
- ASTM D4332
- ASTM D4728
- ASTM D5265
- ASTM D5276
- ASTM D5277
- ASTM D5487
- ASTM D6055
- ASTM D6179
- ASTM D6344
- ASTM D6653
- ASTM D7386
- ASTM F88
- ASTM F1140
- ASTM F1886
- ASTM F1929
- ASTM F1980
- ASTM F2096
- ASTM F2250
- ASTM F3039
Contact Us
Accreditations
Affiliations
The APASS program was designed by Amazon to help support vendors, sellers, and manufacturers in obtaining certification of their products as Frustration Free Packaging (FFP), Ships in Own Container (SIOC), or Prep-Free Packaging (PFP).
