Tyvek® Industrial Packaging
Property and Test Information
Basis Weight, oz/yd2
Description: Mass per unit area
Test Method: ASTM D3776
Test Note: Modified for specimen size
Thickness, mils
Description: Distance between the upper and lower surfaces of the material
Test Method: ASTM D1777
Test Note: 7.15 psi, 0.625- in. diameter presser foot.
Tensile Strength, MD lb/in and CD lb/in
Description: Force required to stretch a sample at a constant rate to the breaking point
Test Method: ASTM D5035
Test Note: Cut strip; CRE tensile tester, crosshead speed of 2 in./min and gauge length of 5 in.
Elongation, MD % and CD %
Description: Amount by which a sample is stretched proportionally from its initial length at its breaking point
Test Method: ASTM D5035
Test Note: Cut strip; CRE tensile tester, crosshead speed of 2 in./min and gauge length of 5 in.
Elmendorf Tear, MD lb and CD lb
Description: Force required to continue a split in a sample (by falling pendulum)
Test Method: ASTM D1424 and ASTM D1922
Test Note: CRE tensile tester, crosshead speed of 5 in./min and gauge length of 1 in.
Tongue Tear, MD lb and CD lb
Description: Force required to continue a split in a sample
Test Method: ASTM D2261
Test Note: Integration average method, CRE tensile tester, crosshead speed of 5 in./min and gauge length of 1 in.
Opacity, %
Description: Percentage of light reflected from a material. So, the higher the number, the more opaque the material is.
Test Method: TAPPI T425
Delamination (internal bond strength), lb/in
Description: Force required to separate layers of a sample sheet
Test Method: ASTM D2724
Mullen Burst, psi
Description: Ability of a sample to resist rupture by pressure
Test Method: ASTM D774
Hydrostatic Head (Water Resistance), in. H2O
Description: Pressure resistance of a material to the penetration of water under a static load
Test Method: AATCC 127
Frazier Permeability, cfm/ft2 @ 0.5 in. H2O delta-P
Description: Volume of air flow through a porous material at a differential pressure of 0.5 inch of water
Test Method: ASTM D737
Gurley Hill Porosity, seconds/100 cc
Description: Time required for a given volume of air (100 cubic centimeters) to pass through an area of material (one square inch) under a pressure of approx. 4.9 inches of water
Test Method: TAPPI T460/ASTM D726
Test Note: (applies to TAPPI T460) 1.0-in2 orifice size at 20-oz. cylinder weight.
MVTR (Moisture Vapor Transmission Rate) via Lyssy method, g/m2/day
Description: Rate at which moisture vapor is transmitted through a sample. The results are reported in "grams transmitted per square meter per day (24 hours)."
Test Method: ASTM E398
Treatment, Corona
Description: Application of an electrical charge to the surface of the sheet, which permanently increases its surface tension thus improving the adhesion of inks and coatings
Treatment, Antistat
Description: Application of a water-soluble antistatic coating to the surface of the sheet, which suppresses static generation during sheet and roll-handling operations
Additional Processing
Description: Applied during the bonding stage
Note: Typical processes include embossing and perforating.