What kind of stainless steel is good for water bottles?

When considering the best type of stainless steel for water bottles, it's essential to understand the different grades and their suitability for safe and long-lasting use. Among the most popular options are SUS304 and SUS316, each offering unique benefits that cater to varying needs.

SUS304, also known as stainless steel 18-8, is widely recognized for its durability and corrosion resistance. This grade contains 18% chromium and 8% nickel, making it a reliable choice for food-grade applications like water bottles. Its ability to withstand rusting ensures that your beverage remains uncontaminated over time, providing peace of mind with every sip.

For those seeking an even higher level of resistance against harsh environments or more acidic contents, SUS316 might be the preferred option. Known as stainless steel 18-10 due to its composition of 18% chromium and 10% nickel, this grade offers superior corrosion resistance compared to SUS304. It's particularly beneficial if you're using your bottle in marine environments or if you frequently store acidic drinks.

On the other hand, SUS201 is not considered a food-grade material suitable for water bottles due to its lower nickel content (around 1%) which compromises its corrosion resistance. While it might be more cost-effective initially, it's not recommended for items that require consistent contact with consumable liquids because it may not provide adequate protection against rust over time.

In conclusion, when choosing a stainless steel water bottle, prioritizing materials like SUS304 or SUS316 ensures both safety and longevity. These grades offer excellent performance in maintaining purity and taste while safeguarding against potential contaminants—a thoughtful investment in your health and hydration needs.

SS 304 (18-8 Stainless Steel)

MaterialAustenitic: Stainless Steel

Chromium Content: 18%

Nickel Content: 8%

Carbon Content: Up to 0.08%

Molybdenum Content: Not present

Corrosion Resistance: Good

Pitting Resistance: Moderate

Crevice Corrosion Resistance: Moderate

Stress Corrosion Cracking Resistance: Moderate

Heat Resistance: Up to 870°C

Cost: Less expensive

Applications: General-purpose use in less corrosive environments such as tableware drinkware kitchenware

SS 316 (18-10 Stainless Steel)

MaterialAustenitic: Stainless Steel

Chromium Content: 16-18%

Nickel Content: 10-14%

Carbon Content: Up to 0.08%

Molybdenum Content: 2-3%

Corrosion Resistance: Excellent

Pitting Resistance: High

Crevice Corrosion Resistance: High

Stress Corrosion Cracking Resistance: High

Heat Resistance: Up to 870°C

Cost: More expensive

Applications: Ideal for use in highly corrosive environments, such as marine and chemical industries

Here are some good stainless steel water bottles which are claim made with double walls of stainless steel 18-8 (SUS304)

Hydro Flask

Made with double-wall vacuum insulated stainless steel, this bottle keeps drinks hot or cold and is dishwasher safe.

Klean Kanteen

This durable, food-grade stainless steel bottles are plastic free which can hold over a liter of liquid.

YETI

Made with 18/8 kitchen-grade stainless steel, this dishwasher safe bottle is leakproof and has double-wall insulation to keep water cold.

ECOWAY

Manufacturer of double walls of stainless steel 18-8 water bottles with triple vacuum insulation for your healty and safety hydration in daily life.

Stanley Tumbler:

Made from high-quality, food-safe 18/8 stainless steel, this bottle is robust and durable.