For self-heating medical heat patch, packaging seal integrity and oxygen permeability directly determine product shelf life. To address this, Hanyao has invested in industry-leading inspection instruments, establishing a professional lab covering “barrier performance – physical strength – environmental weatherability.”
In our packaging integrity section, a vapor transmission tester measures moisture barrier performance to prevent heat pads from absorbing humidity and failing prematurely. Meanwhile, an oxygen transmission tester monitors O₂ permeability, ensuring sufficient oxygen remains inside the pouch to sustain the iron powder’s oxidation reaction. Together, they guarantee stable heat performance from factory to end-user. A seal tester also performs random checks on plastic bags and cartons to eliminate premature activation caused by poor sealing.
Physical strength is another priority. A drop tester simulates accidental falls during transit to verify carton protection, while a hydrostatic pressure tester evaluates non-woven fabric’s water resistance, ensuring safety even in damp conditions. All test data is recorded in real time on our quality management platform, enabling full traceability for every batch.
