Vacuum Degree Detection Methods for Stainless Steel Vacuum Flasks

Q1: What is the simple method for consumers to detect the vacuum degree of stainless steel vacuum flasks?

A1: 1. Hot water test-fill the flask with boiling water, tighten the lid, and touch the outer wall after 5-10 minutes. If the outer wall is obviously hot, it indicates that the vacuum degree is poor (heat transfer occurs); 2. Sound test-tap the flask gently, a crisp and clear sound indicates good vacuum degree, while a dull sound indicates poor vacuum degree; 3. Insulation time test-record the time when the water temperature drops to a certain level (such as 50°C), which should meet the manufacturer's stated standard.

Q2: What is the professional pressure difference detection method for vacuum degree?

A2: The pressure difference detection method uses a vacuum gauge to measure the pressure inside the vacuum layer. The lower the pressure, the better the vacuum degree. The specific process is: drill a small hole in the outer liner of the flask, connect the vacuum gauge, and measure the pressure value. This method is accurate but will damage the product, so it is suitable for factory sampling inspection.

Q3: What is the helium mass spectrometry leak detection method for stainless steel vacuum flasks?

A3: Helium mass spectrometry leak detection is a high-precision detection method. It uses helium as the tracer gas, sprays helium on the outer surface of the flask, and uses a helium mass spectrometer to detect whether helium leaks into the vacuum layer. If helium is detected, it indicates that the vacuum layer has leaks and the vacuum degree is unqualified. This method is widely used in factory quality control.

Q4: What factors will affect the vacuum degree of stainless steel vacuum flasks?

A4: 1. Production process-poor sealing of the vacuum layer during production will lead to air leakage; 2. Transportation and use-collision and falling during transportation or use may damage the sealing structure of the vacuum layer; 3. High-temperature use

Q5: How to choose the appropriate stainless steel surface treatment process?

A5: 1. According to the use environment-products used in corrosive environments should choose pickling passivation or powder coating; 2. According to the appearance requirements-high-brightness products choose polishing or electroplating; 3. According to the functional requirements-wear-resistant products choose electroplating or powder coating; 4. According to the cost budget-polishing and pickling passivation are relatively low-cost, while electroplating and high-end powder coating are higher-cost.