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There are 5 methods used to evaluate the physical parameters of fabrics & garments.
ISO 2960 - BURSTING STRENGTH
ISO 5082 - STRIP TEST
ISO 7854 - FLEX CRACKING
ISO 7854-B - FLEX CRACKING AT LOW TEMPERATURES
ISO 9073-4 - TRAPEZOIDAL TEAR STRENGTH
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ISO 2960 TEST METHOD FOR BURSTING STRENGTH
"Determination of Burst Resistance of Materials, Mullen Method."
Explanation of Test Method:The mullen burst test uses a circular material sample which has been clamped over a diaphragm and is inflated with oil or air. Pressure is applied until the material bursts. The pressure at which the material bursts is the bursting strength of the material sample. Bursting Strength Defined (Mullen Burst):This test is similar to forcing an elbow through a sleeve. It measures the pressure required to burst a material. The measure is in units of force per unit area (N/m²). Pressure is applied to the material clamped onto a device by inflating with oil or air. The precise force required to burst through is measured. In practice it is extremely rare for suits to burst so it is debatable how useful or relevant to everyday use burst testing actually is. Trapezoidal tear is a much better indicator of a garment's physical performance.
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ISO 5082 GRAB TEST
"Determination of breaking strength and elongation at break"
Explanation of Test Method:A piece of material is cut to specifications. It is then place in a testing machine used for measuring breaking strength and elongation of fabrics. Breaking Strength Defined:The maximum tensile force observed during a test in which the specimen is stretched until it breaks. Elongation Defined:The increase in length of a specimen during a tensile test.
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ISO 7854 FLEX CRACKING TEST METHOD
"Determination of Resistance to Damage by Flexing"
Explanation of Test Method:This test subjects the material to dynamic flex fatigue by repeatedly bending the material sample. The test sample can then be visually examined for signs of cracking or other damage, or other investigative techniques such as pressure drop or hydrostatic head can be used for a more rigorous examination of the sample. Flex Cracking Defined:This test measures the ability of the fabric to withstand repeated bending/ flexing motions. Film laminate materials do not perform as well as elastomeric materials with respect to flexing due to the differing nature of their polymer matrixes. The tight highly chemically protective matrix of a laminate product cannot flex as freely as the more open, less chemically protective matrix of an elastomeric product.It must also be understood that the flex resistance of a disposable material need not be any where near as large as a repeatedly used material as the intended life span of the products is widely different.
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ISO 7854-B FLEX CRACKING AT LOW TEMPERATURES TEST METHOD
"Determination of Resistance to Damage by Flexing at Low Temperatures"
Explanation of Test Method:This test subjects the material to dynamic flex fatigue by repeatedly bending the material sample. The test sample can then be visually examined for signs of cracking or other damage, or other investigative techniques such as pressure drop or hydrostatic head can be used for a more rigorous examination of the sample.This is the same method as the ISO 7854 test method but it is performed at sub-zero temperatures to represent the conditions in some of the Northern European countries that users of personal protective equipment may encounter. The test equipment is placed in a climatically controlled chamber. Flex Resistance Defined: This test measures the ability of the fabric to withstand repeated bending/ flexing motions. Film laminate materials do not perform as well as elastomeric materials with respect to flexing due to the differing nature of their polymer matrixes. The tight highly chemical protective matrix of a laminate product cannot flex as freely as the more open, less chemically protective matrix of an elastomeric product.It must also be understood that the flex resistance of a disposable material need not be any where near as large as a repeatedly used material as the intended life span of the products is widely different.
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ISO 9073-4 - TRAPEZOIDAL TEAR STRENGTH
"Determination of Trapezoidal Tear Resistance"
Explanation of Test Method:The effort required to continue a tear across a fabric. A slit in the sample is the starting point for the tear. Force is applied in a continuously increasing way such that the tear propagates along the material sample.
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