Insulation Performance Test: Pour hot water into the thermos cup, tighten the lid, and wait for about 2-3 minutes, then touch the outer surface and bottom of the cup. If the body and upper part of the cup are noticeably warm, it indicates poor insulation effect. A high-quality thermos cup should feel cool at the bottom during this time.
Sealing Performance Check: Fill the cup with water, tighten the lid, and invert the thermos cup for a few minutes or shake it vigorously to see if there is any water leakage. No leakage indicates good sealing performance.
Material Inspection: Check the material of the thermos cup's inner lining. High-quality lining materials such as 304 or 316 stainless steel are corrosion-resistant and provide good insulation. You can learn about the material from the product packaging, labels, or instruction manuals.
Insulation Time Observation: A quality thermos cup retains temperature for a long duration. You can test this by observing the rate at which the water temperature drops over a certain period or by referring to the insulation time data provided by the manufacturer.
Environmental Adaptability: Test the insulation effect of the thermos cup in extreme temperatures, such as in a cold environment, to see if the thermos cup can maintain the water temperature for a long time.
Customer Reviews Reference: Look at other consumers' evaluations and feedback to understand the actual usage situation of the product.
Brand Reputation: Choose a thermos cup from a well-known brand, as these brands usually ensure product quality and insulation effectiveness.
Detail Design: Observe whether the cup's mouth welding is smooth and whether the sealing ring is prone to aging or deformation, all of which can affect insulation.
