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Why Does the Back Adhesive on Sanitary Napkins Sometimes Damage Underwear? What Is the Right Peel Strength?
Why Does the Back Adhesive on Sanitary Napkins Sometimes Damage Underwear? What Is the Right Peel Strength?
Why Does It Damage Underwear? Peel Strength Is Too High
Simply put, making a sanitary napkin “stick firmly” while still being “easy to remove without residue” is a pair of conflicting requirements that must be carefully balanced. When the peel strength is too high, problems arise:
Direct damage to the fabric: The adhesive is so strong that when you tear off the napkin, it may tear the thin backing film or bond so tightly to the fabric fibers that it actually damages the underwear material.
Annoying adhesive residue: This is usually the main manifestation of the problem. What you call “damaging underwear” is often not a physical tear, but a part of the adhesive stubbornly left behind on the underwear fibers, making it difficult to remove.
✅ The Golden Standard: What Is the Right Peel Strength?
According to the Chinese national standard GB/T 8939 (both the 2018 version and the upcoming 2025 version) and accepted industry practice, the peel strength of the back adhesive for sanitary napkins (including panty liners) must be controlled within the range of 100 mN to 900 mN. This range ensures the ideal balance between “sticking well” and “removing cleanly”.
mN (milliNewton) is a unit of force. It measures the force needed to peel the adhesive strip from a standard test fabric. This value directly reflects the stickiness of the adhesive. For this reason, every regular factory inspection report uses this unit.
If your product uses a standard hot melt pressure sensitive adhesive that meets industry requirements, and the coating process is normal, the peel strength will usually be stable. Only when production parameters such as temperature control or adhesive application amount deviate (for example, heating temperature too low makes the adhesive too thick) will the adhesive state change and affect the peel strength.
💯 In summary, the key to the problem is the peel strength value. All sanitary napkins produced in our factory have a back adhesive peel strength strictly controlled between 100 mN and 900 mN, and we conduct real fabric tests before shipment. This is the direct solution to your concern about “adhesive damaging underwear”, and it is our commitment to every customer.