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Product advantages and characteristics of lunch box silicone sealing ring:
1. Food-grade safety material: silicone that meets the national food safety standards is used, which is non-toxic, odourless, and does not precipitate harmful substances. It is more reassuring to come into direct contact with food.
2. Strong sealing and leakage prevention: Precisely adapt the gap between the lunch box lid and the box body to form a tight sealing space, effectively prevent the leakage of soup, porridge, sauce and other liquids, which is convenient to carry.
3. Excellent temperature resistance: It can withstand a wide temperature range of -40℃ to 230℃, suitable for microwave heating, refrigerator refrigeration and freezing, and is not easy to age and deform after repeated use.
4. Flexible, durable and not easy to break: silicone material has good elasticity and tear resistance, is not easy to break after long-term opening and closing, and the service life far exceeds that of ordinary rubber seals.
5. Easy to clean and no dirt: the surface is smooth and delicate, and the stains are not easy to adhere. It can be washed directly or put in the dishwasher to clean, which can easily remove oil stains and no cleaning dead corners.
6. Anti-ageing and erosion resistance: It can resist the erosion of common substances in daily diet such as oil, acid and alkali. After long-term use, it will not yellow, remain hard, and maintain good elasticity.
7. Odour-free and odourless: Silicone itself does not adsorb odours. Clean it in time after use to keep it fresh, avoid the smell of food in the lunch box, and ensure the original taste of the ingredients.
8. Strong adaptability: a variety of sizes and specifications can be selected, which can match different styles of lunch boxes such as round, square, rectangular, etc. Some general-purpose models can also replace the old sealing rings.
9. Lightweight design: light texture, will not increase the overall weight of the lunch box, taking into account the sealing, and more convenient to carry in daily commuting, picnics and other scenes.
Environmental protection can be reused: it can be used repeatedly to replace disposable sealing supplies and reduce the generation of plastic waste, which is in line with the concept of green environmental protection life.

FAQ
1. Is it normal for the new sealing ring to have a strange smell? How to remove it?
Answer: Normal. The new silicone sealing ring may leave a slight odour of the material itself due to the production process, which is not a harmful substance.
• Removal method: Soak it with warm water with a small amount of neutral detergent for 1-2 hours and rinse it; or wipe it with lemon juice and white vinegar and dry it, and the odour will gradually dissipate.
2. What should I do if the sealing ring turns yellow and hard after a long time of use?
Answer: Yellowing is mostly caused by long-term exposure to oil, high temperature or ultraviolet ageing, and hardening is a manifestation of material ageing.
• Slight yellowing: can be cleaned with baking soda water regularly to delay ageing;
• It has obviously hardened and lost its elasticity: it is recommended to replace the new sealing ring to avoid affecting the sealing.
3. Why is the sealing ring suddenly not leak-proof?
Answer: There are three main reasons:
• The sealing ring is deformed, cracked or notched, and loses its elasticity;
• There are food residues and oil stains in the sealing groove of the sealing ring or lunch box lid/box body, resulting in a tight fit;
• The lid/box body of the lunch box itself is deformed, and the adaptability with the sealing ring is reduced.
Solution: Clean the sealing groove; check whether the sealing ring and lunch box are damaged, and replace the sealing ring or lunch box as needed.
4. Can I use the dishwasher to clean the seal?
Answer: Yes. The food-grade silicone sealing ring is resistant to the water temperature and detergent of the dishwasher, and can be directly put into the dishwasher for cleaning (it is recommended to put it in the gap of the tableware rack to avoid being washed away by strong water flow). However, it should be noted that avoid direct collision with sharp tableware to prevent scratches.
5. Do I need to remove the sealing ring when heating the microwave oven?
Answer: There is no need to remove it. The temperature tolerance range of qualified lunch box silicone seals usually covers -40℃~230℃, which can withstand the conventional heating temperature of microwave ovens (generally no more than 100℃). However, it should be noted that the ventilation hole of the lunch box (if any) should be opened before heating to avoid overflowing due to excessive air pressure in the box.
6. How to choose a sealing ring suitable for your own lunch box?
Answer: The key is to look at 3 points:
• Size: Measure the inner diameter of the sealing groove of the lunch box cover (or the diameter and circumference of the old sealing ring);
• Style: distinguish between round, square, rectangular and other shapes to ensure that they match the outline of the lunch box;
• Thickness: Choose a thickness that is suitable for the depth of the sealing groove. If it is too thick, it is easy to swell, and if it is too thin, the seal is not tight.
(It is recommended to give priority to the matching sealing ring of the original lunch box brand, or provide the lunch box model to match the merchant).