Knowing the usefulness and good effects of vacuum storage boxes, many families have a good impression of food storage with lids, but how do choose vacuum storage boxes? The most important point is to see the material of the crisper, followed by the vacuum technology of the crisper, whether it can be as close to the vacuum as possible.
At present, the materials of fresh-keeping boxes on the market are generally stainless steel, ceramics, glass, and plastics (PE, PP, PET, PS, PC, ABS). These plastic materials are mostly used in developing countries because of their low cost and convenient use. The material itself has certain hidden dangers; ceramic and glass fresh-keeping boxes are more common, but they are fragile, bulky, and not conducive to transportation; stainless steel materials are generally not used for fresh-keeping. The following vacuum food storage container supplier will analyze the pros and cons of each fresh-keeping box material for everyone.
1. Glass material - food storage with lids:
Material: Polypropylene Silicone Resin Borosilicate
The product has poor cold resistance and low low-temperature impact strength.
Products are susceptible to ageing due to light, heat and oxygen during use.
Disadvantages: poor toughness, high static electricity.
2. Plastic material - food storage with lids:
1) PE (ethylene polymer)
It is odourless, non-toxic, feels like wax, has excellent low-temperature resistance (minimum operating temperature can reach -70 ~ -100 ℃), has good chemical stability, and can resist most acid and alkali erosion (not resistant to acids with oxidizing properties). ), insoluble in common solvents at room temperature, with low water absorption and excellent electrical insulation properties.
Disadvantages: It is very sensitive to environmental stress (chemical and mechanical action) and has poor heat ageing resistance.
2) PS (styrene polymer)
Styrene polymer is a thermoplastic resin, colourless, odourless, and shiny transparent solid, density 1.04-1.09: chemical resistance, water resistance and excellent electrical insulation and high-frequency dielectric properties.
Disadvantages: poor heat resistance can withstand a maximum of 60-70 degrees, and hot beverages will produce toxins.
3) PP (polypropylene)-round food containers
Non-toxic, tasteless, low density, strength, stiffness, hardness and heat resistance are better than low-pressure polyethene and can be used at about 100 degrees. Has good electrical properties and high-frequency insulation not affected by humidity, density of 0.90-0.91, resistant to High heat resistance, and good toughness and chemical resistance. One of the most commonly used food plastic products.
Disadvantages: But it becomes brittle at low temperature, is not wear-resistant, and is easy to age.
4) PET (polyester)
PET is an opalescent or pale yellow, highly crystalline polymer with a smooth and shiny surface. It has excellent physical and mechanical properties in a wide temperature range, the long-term use temperature can reach 120 ° C, and the electrical insulation is excellent. Even at high temperatures and high frequencies, its electrical properties are still good.
Disadvantages: poor corona resistance, good creep resistance, fatigue resistance, friction resistance and dimensional stability.
5) PC (polycarbonate)
An amorphous thermoplastic resin with excellent comprehensive properties, with excellent electrical insulation, elongation, dimensional stability and chemical resistance, high strength, heat resistance and cold resistance; also has self-extinguishing, flame retardant, non-toxic, colourable and so on.
Disadvantages: The disadvantage is that the hardness is not enough compared with metal, which makes its appearance easier to scratch (the metal kettle will peel off the paint)
6) ABS (acrylonitrile-styrene-butadiene copolymer)
The vacuum food storage container supplier believes that round food containers are thermoplastic polymer materials with high strength, good toughness and easy processing. They are graft copolymers of acrylonitrile-, butadiene and styrene. It is suitable for making general mechanical parts, wear-reducing and wear-resistant parts, transmission parts and telecommunication parts. It is an extremely versatile thermoplastic engineering plastic.
Bestfull's product categories include lunch boxes, mini boxes, round boxes and other vacuum preservation boxes of various shapes. The materials of the products are divided into plastic and glass. Whether you prefer lightweight plastic material or glass material with a better sealing effect, we are a professional manufacturer. In this field, we are at the world's leading level, so that you can use and eat with confidence.