Solutions When Vacuum Flask Doesn’t Retain Heat Well
When a trusted flask suddenly fails to keep drinks hot or cold for hours, instead of rushing to discard it, users may want to consider the following steps on how to diagnose the issue and restore its performance with simple solutions.
As a vacuum flask doesn’t retains heat well, the cause is often one of the followings:
Loss of vacuum insulation: The double-walled vacuum insulation may have been compromised. If the vacuum seal is broken, after a drop or due to manufacturing defects, heat can escape quickly.
Damaged inner lining: Cracks in the inner liner, especially in glass flasks, can destroy the insulation and render the flask ineffective.
Improper usage: Leaving the lid loose, opening the flask frequently, or filling it with boiling water then immediately closing it can affect thermal retention.
Worn-out seals or gaskets: Over time, rubber seals degrade, leading to heat escaping from the lid area.
A proper check of a vacuum flask's functions should allow users to enjoy hot or cold drinks at their convenience.
Checking Flask Effectiveness
Before deciding to replace a vacuum flask,Let’s run a simple test.
Fill it with hot water (around 80–90 degrees Celsius), close it tightly, and leave it for 4–6 hours.
After that time, open and check the temperature. If it’s lukewarm or cool, the insulation is likely damaged.
Listen for unusual sounds (like rattling), which may indicate broken glass in older models.
Resolving Common Problems
If a vacuum flask doesn’t retains heat well, the following solutions may help:
Inspect the rubber seal: Replace the gasket if it’s cracked or loose. Some brands sell spare parts online or offer customer service support.
Clean it thoroughly: Buildup of residue or scale inside the flask may interfere with heat retention. Use baking soda or vinegar to deep-clean it.
Avoid rapid temperature changes: Don’t pour boiling water into a cold flask. Pre-warm it with warm water first to prevent thermal shock.
Handle with care: Dropping the flask, even once, can damage the vacuum layer or inner lining.
Once measures are applied to fix problems, if steam re-emerges from the vacuum flask, it means that the heat-retaining ability has been successfully restored.
Flask Replacement.
Unfortunately, if the vacuum insulation is compromised, there is no effective way to repair it. In this case, it’s time to invest in a new one.
Consider high-quality vacuum flasks with proven heat retention, especially for professional or daily use.
Choose Trusted Brands
Rang Dong's vacuum flask, at which the timeless design meets powerful insulation, can keep drinks hot for 12 hours and cold for 24 hours.
Not all flasks are created equal. Choose reliable brands such as Rang Dong, which belongs to Vietnam’s leading manufacturer of vacuum flask products. The Hanoi-based company’s products are known for high durability and efficiency. Rang Dong offers a wide variety of designs suitable for home, travel, or for making corporate gifts. The company’s products are engineered with the advanced vacuum technology to ensure long-lasting thermal insulation, and which have secured many international quality standard certifications.
Should you have any questions or request a quotation of Rang Dong products, please send us an email to: export@rangdong.com.vn
Websites: en.rangdong.com.vn and vacuumflask.rangdong.com.vn
Besides being useful for storing tea or coffee, vacuum flasks can also be our best assistant for keeping warm, pure water for the whole the day. The latest two models, capable of holding 1 liter and 1.3 liters, should be our first option thanks to their advantages. Let's take a closer look at these products.
Rang Dong thermos has gained its reputation in northern Vietnam decades ago, right from the 1960s when it was first produced because there was no electric or gas stove at the time, not to mention super-speed kettles, while it was cold for three to four months during winter. It may not be an exaggeration when we say the traditional thermos flask was the most essential consumer product at that time. Today Rang Dong's reputation stands firm at home and the company has also been expanding its penetration in overseas markets.
A thermos bottle is a device capable of keeping the temperature of food and drinks, ensuring the original integrity for 12-24 hours depending on the quality of each bottle as well as the production technology. Vacuum-insulated bottles are currently being used by many, especially students and office workers thanks to their compactness, convenience and safety. Let’s find out in the article below.
