Selection and Insulation Principle of Stainless Steel Vacuum Flasks

Q1: What is the insulation principle of stainless steel vacuum flasks?

A1: The core is the vacuum layer between the inner and outer liners. Vacuum can block heat transfer through conduction and convection; at the same time, the inner and outer liners are usually plated with a reflective layer (such as silver plating) to reduce heat radiation. These three mechanisms work together to achieve the insulation effect.

Q2: What material of stainless steel is better for the inner liner of the vacuum flask?

A2: 304 and 316 stainless steel are the best choices. 304 stainless steel is sufficient for daily use, with good corrosion resistance and hygiene; 316 stainless steel has better corrosion resistance, suitable for people who often use the vacuum flask to hold acidic drinks (such as fruit juice, coffee).

Q3: What should be paid attention to when selecting a stainless steel vacuum flask?

A3: 1. Check the insulation performance-ask the merchant for the insulation time (generally, the heat preservation time for hot water is ≥6 hours, and the cold preservation time is ≥12 hours); 2. Check the inner liner-should be smooth, free of burrs and odors; 3. Check the seal-tighten the lid and invert the flask to see if there is water leakage; 4. Choose products with brand and certification (such as FDA).

Q4: Why does the stainless steel vacuum flask have an odor?

A4: Common reasons include: 1. New flasks have residual production process odors (such as plastic lid odors); 2. Long-term storage of drinks leads to bacterial growth; 3. The inner liner is contaminated by strong odorous substances. The odor can be removed by soaking in lemon water or baking soda water for 2-4 hours, then rinsing thoroughly.

Q5: How to clean and maintain a stainless steel vacuum flask?

A5: 1. Use a soft brush and neutral detergent to clean the inner liner, avoiding hard brushes to scratch the surface; 2. Clean the lid and seal ring thoroughly, and dry them separately to prevent mold; 3. Do not put the flask in a dishwasher for cleaning, as high temperature and high pressure may damage the vacuum layer; 4. Avoid storing carbonated drinks and acidic drinks for a long time.