Author: Kongdy Patch
Date: 10 10，2023
While heat patches share the same basic mechanism of action, differences in ingredients and delivery methods impact product performance.
Iron Powder – Most critical active ingredient that oxidizes when exposed to air to provide heat. Higher amounts sustain warmth longer.
Activated Charcoal – Absorbs water and helps control rate of iron oxidation. Assists heat generation process.
Salt – Regulates oxidation rate and stabilizes ingredients in formulation. May also provide soothing benefits.
Water – Provides hydration to enable oxidation reaction. Varying amounts impact duration of heat release.
Adhesives – Performance differences in tack strength, breathability and skin adhesion greatly affect warming sensation.
Outer Films – Materials like polyethylene and non-woven fabrics determine heat retention properties.
Onset of Action – Layer structure and iron levels control speed of initial heat activation upon application.
Maximum Temperature – Formulations should heat skin safely up to 104°F before gradually declining over duration of use.
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