Step 1. Photo-degradation
The major ingredients of SEPPA are organic calcium carbonate (CaCo3) from marine beings. The calcium carbonate melts in plastic ware. Under UV light from the sun, the plastic becomes fragile into pieces.
PStep 2. Biodegradation
The marine organic calcium carbonate contains a large amount of chitin. Chitin under high temperature dehydration (above 100oC) produces chitosan. Chitosan melts in plastic ware where a large amount of bacteria will grow. The bacteria will nibble the plastic.
Step 3. SEPPA photo-degradation + biodegradation
For example: At the early stage, the plastic is coated with agricultural film over 30% SEPPA. After photo-degradation, the plastic in agricultural film contains hydroxyl which will have a chemical change under UV light from the sun. The C-H bond will be destructed, and the plastic will break and produce holes. At the later stage, it is unnecessary to recycle the debris. The debris is just rolled in soil. The undegraded agricultural film contains a large amount of chitosan where, a large amount of bacteria will grow. The bacteria continue to nibble and degrade the remaining plastic. Thus, the gricultural film can quickly and completely degrade. The complete degraded products can be used as organic fertilizer.
Step4. Degraded products
calcium hydroxide (CaO), water (H2O) and carbon dioxide (CO2)