Bursting Strength Setting It Correctly on a Tech Pack
Bursting Strength should be written into the tech pack with a value, a tolerance and a method. This removes ambiguity from quotations.
Definition to agree
resistance to a perpendicular load. Working figures for Bursting Strength normally sit around above 300 kPa for stretch knits in mainstream production. Note ISO 13938-1 hydraulic method on the tech pack so nobody tests against an older revision.
Target value
Open the specification at above 300 kPa for stretch knits, adjusted to the end use. Record elastane content alongside Bursting Strength, because blends shift the measured value. A result outside above 300 kPa for stretch knits usually points to process drift rather than to the fibre itself.
Method line
Always pair the target with ISO 13938-1 hydraulic method so the mill and the laboratory test the same way. Keeping reference values for Bursting Strength lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ISO 13938-1 hydraulic method, since both affect the reading.
Tolerance line
State plus or minus limits to keep production realistic while protecting the requirement. Working figures for Bursting Strength normally sit around above 300 kPa for stretch knits in mainstream production. Note ISO 13938-1 hydraulic method on the tech pack so nobody tests against an older revision.
Approval step
Approve the result on pre-production bulk rather than on development fabric only. Record elastane content alongside Bursting Strength, because blends shift the measured value. A result outside above 300 kPa for stretch knits usually points to process drift rather than to the fibre itself.
