The plastic lunch box is a container made of food grade plastic for the convenience of our take-away food. It is very common in everyday life, but many people ask: Can plastic lunch boxes be heated in a microwave oven?
Heating the plastic lunch box will release the plasticizer
Plasticizers enhance the flexibility of plastics, making them easier to process and plastic, and have been widely used in the industry. Each plastic has its heat-resistance limit. In plastics for food use, the most heat-resistant is that polypropylene (pp) can withstand 140 Â° C, and secondly, polyethylene (pe) can withstand heat of 110 Â° C, while polystyrene Ethylene (ps) can only be heat resistant to 90 Â°C. At present, the commercially available plastic lunch boxes for microwave ovens are mainly made of pp or pe. If the temperature exceeds their heat resistance limit, there is a possibility of releasing plasticizers, so long-term heating of plastic lunch boxes with high temperature should be avoided.
What are the hazards of plasticizers on the human body? According to the survey, plasticizers can interfere with the body's endocrine system and affect the reproductive system of the human body, especially men. Animal studies have shown that long-term intake of plasticizers may damage the liver, kidneys and affect growth.
Plastic tableware will be changed after a long time
Plastic products also have a shelf life. After expiration, the plastic will age and become discolored and brittle. If the plastic box used is yellow or no longer transparent, it should be replaced as soon as possible. Therefore, there are always people on the Internet who say, "The plastic lunch box has been used for a long time, and there will be bumps inside. If the lost part is not well, it will be eaten into the stomach." Don't believe it. Therefore, consumers must pay attention to the shelf life of plastic products. At the same time, aged plastics can release substances harmful to the human body. As for how long a plastic lunch box can last, depending on the method of personal use and cleaning, the shelf life of most plastic products is generally about three to five years. If used frequently, it is better to replace it in one to two years.
Need to be wary, there are many microwave oven-specific heating boxes in many shopping malls and supermarkets. This kind of lunch box is safer than plastic lunch boxes in the microwave oven. However, many microwave oven-specific heating boxes have special signs for microwave ovens, but it There may also be counterfeit goods, so we also pay attention to the trademark and production address of the product when purchasing.
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DUPLEX STAINLESS STEEL
Duplex Stainless Steels Available
Yuhong Group supplies LDX2101, 2205, Ferralium 255, Zeron 100 and LDX2507 in the form of plate, sheet, strip, bar, pipe, tubing, pipe fittings, flanges and weld wire.
Duplex Stainless Steel Overview
Duplex Stainless Steels, also referred to as austenitic-ferritic stainless steels, are a family of grades with about equal proportions of ferrite and austenite. These steels have a duplex microstructure which contributes to their high strength and high resistance to stress corrosion cracking. Due to their high content of chromium, nitrogen and molybdenum, duplex steels offer good resistance to local and uniform corrosion. Duplex stainless steels have good weldability.
Today, modern duplex stainless steels can be divided into three groups:
Lean Duplex such as LDX2101
Standard Duplex such as 2205, the work-horse grade accounting for more than 80% of duplex usage
Super Duplex such as Ferralium 255 and Zeron 100 and LDX2507
Of the duplex grades, duplex 2205 is the most widely used. However, the super duplex steels like ZeronÂ® 100 and LDX2507 are excellent for servicing severe corrosive environments, such as offshore and marine applications. Lean duplex 2101 is available as an economic alternative to 300 series stainless steels.
What are the Characteristics of Duplex Stainless Steels ?
Very good resistance to uniform corrosion
Very good resistance to pitting and crevice corrosion
High resistance to stress corrosion cracking and corrosion fatigue
High mechanical strength
Good sulfide stress corrosion resistance
Good abrasion and erosion resistance
Good fatigue resistance high energy absorption
Low thermal expansion
In what Applications are Duplex Stainless SteelsÂ® used ?
Oil and gas equipment
Seawater desalination plants
Chemical industry, especially when handling chlorides
Desalination plants and seawater systems
Pulp and paper industry
Cargo tanks and pipe systems in chemical tankers
Firewalls and blast walls on offshore platforms
Pressure vessels, reactor tanks, and heat exchangers
Rotors, impellers and shafts
Duplex Steel Fitting,Duplex Steel Pipe Fitting,Duplex Stainless Steel Fitting
YUHONG GROUP CO.,LIMITED , https://www.alloypipeline.com