Selecting a High-Safety Insulated Cup: A Technical Guide
Selecting a High-Safety Insulated Cup: A Technical Guide
During the winter season, it is a common practice for many individuals to carry insulated cups for hydration while outdoors. However, the plethora of insulated cups available on the market can be overwhelming, and those of inferior quality may pose health risks. This technical guide will outline the criteria for selecting an insulated cup with high safety standards and identify the types of liquids that are not recommended for use in such containers.
Materials for insulated cups include stainless steel, glass liners, and ceramic liners, among others. Stainless steel insulated cups are considered relatively safer due to the multi-step manufacturing process they undergo prior to fabrication. This process typically involves cleaning, rust removal, and passivation, which are designed to prevent the formation of harmful substances.
Stainless steel materials are commonly categorized into three grades: 201, 304, and 316.
1.Grade 201 stainless steel primarily consists of chromium, manganese, and nickel, and it exhibits relatively poor corrosion resistance. Despite polishing, it retains a dark, shiny appearance and is mainly used in decorative pipe applications where material specifications are not stringent.
2.Grade 304 stainless steel is composed mainly of chromium and nickel, offering excellent corrosion resistance and heat resistance. It has good formability under hot processing conditions such as stamping and bending, and it does not undergo hardening due to heat treatment. This grade is commonly used in the manufacture of corrosion-resistant containers, tableware, furniture, railings, and medical instruments.
3.Grade 316 stainless steel, which is an enhancement of grade 304, incorporates the metal molybdenum, thereby providing stronger corrosion resistance. It is primarily utilized in the food industry, watch and jewelry applications, pharmaceuticals, aerospace, and surgical instruments.
Both grades 304 and 316 are classified as food-grade stainless steels and are more environmentally friendly. When selecting an insulated cup, it is recommended to choose one marked with the 304 or 316 grade, or identified as "for food contact," to ensure greater safety.
The following liquids are not recommended for storage in insulated cups:
1. Acidic beverages, such as orange juice and cola, can react chemically with stainless steel, potentially leaching harmful substances. This may damage the inner wall of the cup and could lead to a decrease in the cup's sealing performance, thereby affecting the insulation effectiveness.
2. Tea, when subjected to high and constant temperatures, is prone to fermentation, which results in the destruction of a significant amount of vitamins, a reduction in nutritional value, and an increase in harmful substances.
3. Hot soups or stews are not suitable for storage in insulated cups, as the salt content in the soup can react chemically with the cup's walls.
4. Chinese herbal medicine soups or decoctions, due to their complex composition, are prone to chemical reactions with the materials of the insulated cup, which may reduce the efficacy of the medicine and potentially produce harmful substances.
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