SATRA launches test method revisions
Three SATRA test methods have been reviewed and re-published.
SATRA TM34:2019 – ‘Resistance to water penetration – Maeser test’ is used to determine the resistance of a material to water penetration upon flexing. This method is mainly applicable to footwear upper outer materials, but can also be used with any flexible sheet material. It has been revised to include the option to measure water absorption at either a specific number of flexes or at the point at which water penetration has occurred, and includes formulas for calculating the percentage absorption.
SATRA TM74:2019 – ‘Breaking force, extension at break, strength factor and tightness of threads’ has been written to determine the breaking force, breaking extension, strength factor and tightness of threads. The method is applicable to all types of thread used in the construction of footwear, and was reviewed to clarify the calculation for tightness and strength factor, as well as to improve readability.
SATRA TM411:2019 – ‘Peel strength of footwear sole bonds’ is used to determine the strength of the bond between the sole and upper or between bonded layers of the bottom construction, at a number of points around the lasted margin of completed footwear. The revision focuses on accuracy of measurement of the bonded width of specimens, which is crucial in correctly determining the quality of the bond. It also now requires the width of the bonded margin to be stated, as this helps to determine the overall strength of the bond in conjunction with its quality. For sandal straps, the minimum strap width qualifying for this method has increased. Optional ageing pre-treatments are now also detailed. A number of editorial changes improve clarity of meaning, give useful extra details and provide updated references to other standards.
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This article was originally published on page 32 of the September 2019 issue of SATRA Bulletin.