FAQ
What Does Burst Strength Mean on Kraft Paper Specs?
Short-answer FAQ on kraft paper burst strength for packaging buyers: what it indicates, limits of the metric, how it relates to bags/mailers, and what to request on RFQs.
Quick answer
Burst strength indicates how much pressure kraft paper can resist before rupturing in a standard burst test. Buyers use it as one strength signal for bags and wraps, but it does not replace tensile, tear, or converting trials for handles and seams.
What it helps with
Comparing lots and grades when paper toughness matters, and catching weak fiber mixes that fail under pressure-like loads.
What it does not guarantee
A high burst value does not ensure handle pull strength, score performance, or print rub resistance. Always read burst with GSM, grade type, and end-use tests.
How to request it
Ask for the test method, conditioning, and whether values are typical or minimums. Require COAs tied to shipped lots when bags are load-critical.
When to emphasize other tests
Twisted-handle bags often need pull and bottom tests; mailers may need puncture/tear focus. Use burst as part of a scorecard, not the only gate.
RFQ
GSM; grade; burst method/minimum
End use; other strength tests required
COA/lot retention; sample sheets
Converting trial plan
Related PackTrades Knowledge
How to Spec Kraft Paper GSM for Shopping Bags and Mailers, What Is Sack Kraft vs Extensible Kraft for Packaging?, Kraft Paper Supplier Guide for Packaging Buyers, Twist-Handle Paper Bag Load Spec Checklist for Retail.
Buyer Checklist
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