Moisture‑proof cellophane is a single‑ or double‑side coated regenerated cellulose film that significantly reduces water vapor transmission (WVTR as low as 5‑8 g/m²·24h, vs. 18 for standard). It is ideal for packaging hygroscopic products such as tea, coffee, dried herbs, pharmaceutical tablets, and confectionery in tropical climates. The coating (typically PVDC or acrylic) also enhances heat sealability and aroma retention while maintaining transparency.

Standard cellophane (viscose or NMMO process) is coated on one or both sides with a thin layer of PVDC (polyvinylidene chloride) or water‑based acrylic copolymer via gravure or reverse roll coating. The coated film is then dried in a flotation oven. The coating forms a continuous barrier to water vapor and oxygen while remaining heat‑sealable. For food contact, the coating complies with FDA and EU regulations. The product remains biodegradable? Note: PVDC is not biodegradable – but some acrylic coatings are compostable. The problem description says "防水玻璃纸" (waterproof cellophane) – typically these are coated and not fully biodegradable, but for B2B we state the facts. We'll present as high barrier but note coating type without false claims.

• Tea & Coffee Packaging – Preserves aroma and prevents moisture absorption in humid environments.

• Pharmaceutical Blister Foils – Provides high barrier for hygroscopic drugs.

• Dried Herbs & Spices – Extends shelf life significantly; see‑through for product identity.

• Confectionery in Tropical Markets – Prevents candy from sticking and sugar bloom.

Moisture‑proof cellophane offers the transparency and renewability of cellulose with barrier properties approaching aluminum foil – essential for high‑humidity regions.