Thermal Flask & Vacuum Flask Malaysia

Q1: Is a vacuum flask the same as a thermal flask?

Yes, a vacuum flask and a thermal flask refer to the same product. Both use double-wall vacuum insulation technology to maintain the temperature of your beverages. In Malaysia, the two terms are used interchangeably. The vacuum layer between the inner and outer walls prevents heat transfer through conduction, keeping your drinks hot or cold for extended periods.

Q2: How long does a thermal flask keep drinks hot?

Our thermal flasks keep drinks hot for 12 to 24 hours, depending on the model and capacity. Larger vacuum flasks (750ml–1500ml) generally retain heat longer than smaller ones. For best results, pre-heat your flask with hot water for 5 minutes before filling it with your beverage.

Q3: What material is best for a vacuum flask?

Food-grade SUS304 stainless steel (18.8) is the gold standard for vacuum flasks. It is highly corrosion-resistant, safe for food and beverage contact, and provides excellent heat retention. All Relax thermal flasks use SUS304 stainless steel and are SGS-certified for safety compliance.

Q4: How do I choose the right thermal flask size?

For daily commuting, a 350ml–500ml thermal flask is ideal — compact enough for your bag without adding weight. For office use, 500ml–750ml works well to keep you hydrated throughout the workday. For outdoor activities, family outings, or sharing, consider a 1000ml–1500ml vacuum flask with a larger capacity.

Q5: How do I clean my thermal flask properly?

Clean your thermal flask with warm soapy water and a soft brush after each use. For deep cleaning or stubborn odours, fill the flask with a mixture of baking soda and warm water, let it soak for 2–3 hours, then rinse thoroughly. Avoid using bleach, chlorine-based cleaners, or metal scrubbing brushes as these can damage the inner wall of your vacuum flask.