How to Distinguish Genuine PP Material from Fake? A Must-Read Guide for Buying Lunch Boxes
I. Characteristics of PP Material
PP (polypropylene) is a safe food-grade plastic. It can withstand high temperatures of 100-140℃, is non-toxic, odorless, and BPA-free. It is lightweight, impact-resistant, and resistant to acids and alkalis, and does not react with food.
II. Distinguishing Genuine PP from Fake
Identification and Certification: Genuine PP features the "♷" or "5" recycling symbol, food-contact certifications (such as FDA), and manufacturer information.
Sensory Identification: Pure PP is semi-transparent and milky white, odorless when heated, and has a smooth surface. Inferior products may appear yellowish or overly white, emit an odor when heated, and feel rough.
Physical Tests: Genuine PP does not deform when heated (≤140℃), floats in water, and is flexible. Fake PP deforms easily, sinks in water, and is brittle.
Combustion Test (Use with Caution): When genuine PP burns, the flame is blue and yellow, with wax-like drippings and a paraffin-like smell. Fake PP emits black smoke, has a pungent odor, and leaves black, sticky residues.
III. Key Points for Purchase
Channel: Choose supermarkets, brand stores, or official online stores. Be wary of low-priced products.
Details: Check for burrs, the sealing strip, and the fit between the lid and the box.
Functions: Confirm "microwave-safe", "food-grade PP", and the maximum temperature.
IV. Fake PP Materials
PS: Features the "♸" or "6" recycling symbol, withstands temperatures of 70 - 90℃, and is brittle.
PVC: Marked with "♹" or "3", may contain plasticizers, and releases toxins at high temperatures.
Recycled PP: Contains impurities, has uneven color, and emits odors.
V. Standards for High-Quality Lunch Boxes
Made of 100% food-grade new PP, with excellent workmanship, no defects, complete certifications, reasonable design, and from a reliable brand.
VI. Use and Maintenance
Clean with a neutral detergent for the first use. Avoid scratching with hard objects during daily cleaning. Do not exceed the specified temperature. Replace promptly if discolored or deformed. Store away from direct sunlight and high temperatures.
By following these guidelines, you can distinguish genuine PP from fake and purchase safe lunch boxes. Do not buy inferior products just because they are cheap.
