PET (Polyethylene terephthalate)
Commonly used in mineral water bottles, carbonated beverage bottles, etc. Heat resistant up to 70℃, easily deformed, and may leach harmful substances. After 10 months of use, #1 plastics may release the carcinogen DEHP. Do not leave in a car exposed to sunlight; do not store alcohol, oil, etc.
HDPE (High-density polyethylene)
Commonly used in white medicine bottles, cleaning products, and bath products. Do not reuse as water cups or storage containers for other items. Do not reuse if not thoroughly cleaned.
PVC (Polyvinyl chloride)
Commonly used in raincoats, building materials, plastic films, plastic boxes, etc. Excellent plasticity and low price, hence its widespread use. Only heat resistant up to 81℃. Harmful substances may be released at high temperatures, so it is rarely used for food packaging. Difficult to clean and prone to residue; do not reuse. Do not buy if intended for beverages.
PE (Polyethylene)
Commonly used in cling film, plastic films, etc. High temperatures produce harmful substances, and these toxins, if ingested through food, may cause breast cancer, birth defects, and other diseases. Do not microwave plastic wrap.
PP (Polypropylene)
Commonly used in soy milk bottles, yogurt bottles, juice bottles, and microwave-safe food containers. With a melting point as high as 167℃, it is the only type of plastic container that can be microwaved and can be reused after careful cleaning. Note that some microwave-safe containers are made of PP (5.) for the body but PE (1.) for the lid. Since PE cannot withstand high temperatures, the lid should not be microwaved.
PS (Polystyrene)
Commonly used in instant noodle bowls and fast food containers. Do not microwave, as high temperatures may release chemicals. When containing acidic (such as orange juice) or alkaline substances, it may decompose and release carcinogens. Avoid using fast food containers to pack very hot food. Do not microwave instant noodles in bowls.
PC (Other)
Commonly used in water bottles, thermos flasks, and baby bottles. Department stores often use water bottles made of this material as promotional gifts. It easily releases bisphenol A (BPA), a toxic substance harmful to humans. Do not heat it or expose it to direct sunlight.