18 years as a one-stop custom manufacturer of shaker bottles and sports water bottles.
Stainless Steel Vacuum Flask Trend Report
stainless steel vacuum flask is one of the artistic works of our designers. They have strong innovation and design capabilities, endowing the product with an exceptional appearance. Having been produced under the strict quality system, it has been certified to be superior in its stability and durability. Before being shipped out by Kingline, it must pass several quality tests performed by our professional QC team.
Kingline has been widely spread across the world for its quality-oriented strategies. Not only do the products excel others in performance, but the services are equally satisfactory. The two combined to have double effects to upgrade the customer experience. As a result, the products receive numerous comments on websites and attract more traffic. The repurchase rate keeps increasing exponentially.
At Kingline, we offer our customers who are inclined to do business with us samples for testing and consideration, which will definitely remove their doubts about the quality and performance of stainless steel vacuum flask.
1. Material level and safety
Food Grade Stainless Steel (304/316)
304 stainless steel: Basic food-grade material, good corrosion resistance, suitable for holding room temperature water or weak acidic beverages, but long-term exposure to strong acid (if juice or carbonated beverages) still has a slight risk of metal precipitation.
316 stainless steel: upgraded version of food-grade material, adding molybdenum elements to improve corrosion resistance, can withstand higher concentrations of acidic liquids, suitable for long-term use and better safety.
Non-food grade stainless steel (201, etc.)
It is easy to precipitate heavy metals such as manganese and nickel, especially in high temperature or acidic environments, which may cause health risks and must be strictly avoided.
2. Insulation performance and structural design
Single-layer stainless steel cup
Advantages: Lightweight, low cost, suitable for room temperature or short-term insulation needs6.
Disadvantages: No heat insulation layer, easy to burn when installing hot water, and short insulation time (about 2-3 hours).
Double-layer vacuum stainless steel cup
Advantages: The vacuum insulation layer can extend the insulation time (hot water for 6-12 hours, cold water for more than 24 hours), and has better anti-scalding performance.
Disadvantages: Larger weight and higher price.
3. Differences in applicable scenarios
Daily household use
Recommended model: 500ml-1L capacity, direct drinking cup with leak-proof design, 316 stainless steel is preferred.
Outdoor/Commuter
Recommended models: double-layer vacuum cup (fall-proof design), portable hook or cup cover accessories to avoid choosing open and spillable styles.
Special drink demand
Acidic liquids (juice, coffee): 316 stainless steel cups must be used and cleaned in time after each use to avoid residual corrosion.
High temperature liquid: Double-layer anti-scalding cups are preferred to reduce the risk of excessive surface temperature.
4. Key points of health and maintenance
Cleaning Specifications
Avoid using strong oxidative cleaners (such as bleach, soda) to prevent chemical reactions with stainless steel.
Soak it regularly in white vinegar to remove scale to prevent bacteria from growing.
Tare for use
Do not store high salt or strong acidic liquids (such as soy sauce, lemon juice) for a long time to avoid accelerating metal precipitation.
Avoid heating of the microwave. Stainless steel material will reflect microwaves and cause damage to the equipment.
5. Price-performance options
If you need high cost performance, you can choose 304 stainless steel single-layer cups, which are suitable for basic needs.
Pursuing higher quality You can choose a double-layer vacuum cup, with more reliable material and craftsmanship.
Tips Avoiding Tips
Check the "SUS304/316" logo on the bottom of the cup or label, and be wary of fuzzy publicity that is only marked "stainless steel".
You can also prefer a design with silicone sealing ring and anti-slip bottom pad to improve use safety.
1. Core material selection
Priority 304 or 316 stainless steel
304 stainless steel: Complies with food grade standards (including 18% chromium + 8% nickel), safe in daily use and cost-effective, suitable for filling coffee, tea and other regular drinks.
316 stainless steel: Add 2% molybdenum, which has stronger corrosion resistance. It is suitable for long-term acidic beverages (such as lemonade, ice American), but the price is higher than 304.
Tips for avoiding pits: The inner liner must be clearly marked "SUS304" or "SUS316". Beware that low-priced products are used to impersonate 201 stainless steel (high manganese content and prone to rust).
Material process verification
Observe whether the surface is smooth and burrs free, and the inner liner has no seams to reduce dirt residue.
Simple test: The magnet has weak adsorption power (low iron content) or is soaked in salt water for 24 hours without rust spots, indicating that the material is purity .
2. Insulation performance and design
Vacuum insulation technology
The double-layer vacuum structure can block heat transfer and the insulation duration ranges from 8-24 hours. Mirror electrolysis process has longer insulation.
Small-diameter cup shape has better insulation effect than wide-diameter cup.
Cup mouth and capacity design
Commuting/Office: Choose 300-500ml lightweight model, paired with one-handed open cover or anti-slip bottom pad.
Outdoor/Home: Large capacity model above 800ml, with a strap or an anti-slip handle more practical.
Cleaning convenience: Wide-mouthed cups are easy to clean but quickly dissipate heat. Narrow-mouthed cups need to be removed and cleaned regularly.
3. Safety and usage details
Sealing detection
Inverting to test whether water leakage is required, the silicone sealing ring needs to be replaced regularly.
The press-type cup lid is suitable for driving scenarios, and the knob is suitable for office scenarios.
Avoid storing drinks
Acidic liquids (such as lemon juice, carbonated beverages): may corrode the inner liner of non-316 material.
Dairy products (milk, soy milk): It is prone to deterioration in 4 hours under a closed environment.
4. Additional functions and brand reference
Plus point design
Removable tea leak, anti-slip bottom pad, one-button elastic cover, etc. to improve convenience.
Double-layer glass anti-scalding design or intelligent temperature control function is suitable for temperature-sensitive beverages.
Cost-performance ratio
Summary: Food-grade 304/316 stainless steel material is preferred, and capacity and design are matched according to the use scenario, and practicality is ensured through sealing and insulation testing.
After reading this practical guide to choosing stainless steel water cups, do you have the right choice? Please feel free to contact us, we are happy to introduce our products to you! We are very confident that you will be satisfied with our products!
It is made of food-grade 304 stainless steel, and its acid and alkali corrosion resistance makes the cup lifespan reach more than 5 years, which can reduce plastic waste by about 1.3kg per year compared to disposable cups.
Intelligent temperature control system
• Double-layer vacuum structure: usually keep heat for about 12 hours
• Keep cold for about 20 hours
Let you drink coffee of a tasteful temperature at any time
Scene design details
Business version: You can choose to be convenient to carry, and you no longer have to worry about spilling coffee on a suit when commuting. Choose a coffee cup designed with one-handed opening and closing to suit the meeting scene, or you can choose a large capacity to meet the needs of office workers in a day.
Sports style: You can choose to have a leak-proof lock, 45° tilt, and it can be completely leak-free. It will still be tasteful after exercise. You can pack it and take it out.
Of course, our factory can also design and customize products according to your requirements, customize your exclusive logo and pattern according to your requirements, and choose different printing methods. Welcome to inquire.