... frost, harsh weather, birds, slugs and pests,etc.2.Cloches top vent for temperature and ventilation adjustment.3. ... seedlingsUsageIdeal for seedlings such as flowers, vegetables and plants.2.Polyvinyl chloride (PVC) is a widely used thermoplastic polymer. PVC ... density polyethylene - Bottles for milk and washing-up liquids.PVCPolyvinyl chloride - Food trays, cling film, bottles for squash, mineral ...