Stainless Steel Thermos Flask Problems

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Ecoway Houseware Limited
Ecoway Houseware Limited

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Stainless Steel Thermos Flask Problems

A stainless steel thermos flask is best water bottle that can keep water ice cold to drink for a whole long and hot day, and it is made from the stainless steel 18-8, this material is highly resistant to rust and does not need a liner, compliant with California Prop 65 regulations and Title 21 of the FDA Code of Federal Regulations, Non-Toxic, BPA-Free, Reusable, Eco-Friendly.

But what problems has for the stainless steel thermos flask to use in our daily hydration? Let’s see what people said when they are using the flask:

1. Rust corrosion inside of the metal bottle

2.Easy to get dent on the flask

3.Bottle cap is plastic not stainless steel

4.Too much heavy

5.Not that easy to clean


01.Rust corrosion on the stainless steel thermos flask

It’s easy to get rust inside of the stainless steel water bottle, especially when you forgot to wash it after drink with milk, juice, after couple nights, then you will find there’s terrible rust inside of the bottle, but don’t be over worry, you can use White Vinegar to remove the rust easily, follow the steps of how to clean stainless steel water bottle to remove rust inside of the bottle.

Dent On Stainless Steel thermos flask bottle

02. Easy to get dent

It can’t avoid the dent happens on your stainless steel thermos flask, at home, at camping, or on the trip, bottle accidentally drop on the hard floor then get a dent on your bottle, and it could cause your thermos flask stop working, that’s why it can not keep your water ice cold  and easy to get warm.

03. The cap part is plastic not stainless steel

Although most of stainless steel thermos flask brands claim its bottles are reusable and made from recyclable stainless steel material, but most of them still use plastic material to make their bottle cap, why is that?


1.Plastic material doesn’t means toxic or unsafe for hydration, the two kinds plastic material “polypropylene,PP” and “Eastman Tritan” are both BPA Free, FDA/LFGB comply, which is widely use for tableware, baby feeding bottles, kitchenware, sports water bottle. You can be worry free to use the plastic cap for your stainless steel bottle.

2. In technically plastic cap is easy to make, stainless steel cap can be achieved for simple and regular round shape design, but can not make for the complex design bottle cap and the cap with straws, so that’s why you see most of the bottle cap is plastic made.

3.Cost is cheaper with plastic cap, of course the cost is cheap to make a plastic cap than stainless steel cap when compare with same design, because it much easy to be produced.

4.Better function “leaking proof, heat retention, screwing smooth”, it’s easy to guarantee the leaking proof for a plastic lid, and easy to screw the bottle cap into bottle and screw it off, also plastic cap has better heat retention due to stainless steel has better “thermal conductivity” than plastic.

Anyway, we like the stainless steel thermos flask because it is stainless steel not plastic, it is problem for us when its bottle cap is plastic not stainless steel, not because we prefer it is stainless steel made if have the choice.


04.Too much heavy

It’s too much heavy when the stainless steel thermos bottle compare with a plastic water bottle. A thermos flask usually weight from 200 g to 400 g, but a reusable plastic water bottle usually weight from only 50 g to 100 g, that we can see the thermos bottle it is too much heavy, that’s also one of the reason the metal bottle easy to have accidentally dropping on the floor.

05.Not that easy to clean

When you clean the plastic water bottle, it is easy to see if we clean it completely because it is transparent, but stainless steel thermos flask, that needs you pay more attention to clean and wash it, then watch inside of the flask to check after cleaning.

It is also easy to scratch the surface of the stainless steel flask inside and outside, that require you wash the bottle by hand with soft bottle brush, but it is no problem to wash it with dishwasher when your thermos flask is stainless steel color or powder coating color, the two colors won’t have discolor or painting off problem with dishwasher, other colors, it is better to wash it by hand only.

Although there’s some problems with the stainless steel thermos flask, but we still love it, because it is reusable, eco-friendly, food grade safe, and it is best option for keeping our ice cold water for 24 hours in hot Summer day without electronic. More information you want to know for the stainless steel thermos bottle products that how it works, how it is made, how much it cost to make, you can reach a manufacturer supplier like “Ecoway Houseware Limited” to get instant technique supports.

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