| Scope |
To determine the spot thickness and grammage of packaging material
This test method covers the measurement of thickness of flexible packaging materials and paper and paperboard using contact micrometers
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| Reference |
ASTM F2251-03 – Standard test method for thickness measurement of flexible packaging material
ASTM D645/D645M-97 – Standard test method for thickness of paper and paperboard
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| Test Procedure |
- The test specimens should be condition as per standard WATER-GDC-T099.
Condition set 1 - Thickness
- The thickness is measured using a micrometer.
- Clean the micrometer contact area (foot and anvil – flat ground circular fixed face - with a tissue)
- Place the specimen on the anvil in such a position that all points on the peripheries of the contact surface are at least 6mm (0.25 in) from the edges of the specimen
- Release foot and allow reading to stabilize
- Make at least five (5) measurements on each specimen taking readings on outer and inner locations. Record the average, maximum, and minimum thickness obtained on each test piece.
- Report the average result and this should be used for all calculations.
Condition set 2 - Grammage
- Lay the sample flat on the cutting pad, on a firm horizontal surface.
- Press the steel template firmly down on to the surface of the sample.
- Carefully cut around the template, using single cuts, holding the cutter upright to ensure a straight edge.
- Weigh the cut out section to 0.001g.
Calculation
For the samples where a 10cm x 10cm (4" x 4") has been taken:
- Grammage = (sample weight x 100) grams per square meter
- Basis weight = (sample weight x 0.0198) pounds per 1000 square feet
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For smaller samples:
- Grammage = sample weight x 106 grams per square meter
X*Y
X and Y = dimensions of sample in mm.
- Basis weight = (sample weight x 317.5) pounds per 1000 square feet.
X*Y
X and Y = dimensions of sample in inches.
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| Level of Acceptance / Success Criteria |
Individual samples must meet required specification. |
