In today's fast-paced work environment, portable lunch boxes with good thermal retention have become popular among office workers. They not only ensure we can enjoy hot meals during busy work hours but are also favored for their compact and portable design. However, what should we pay attention to when using a new office portable insulated lunch box for the first time?

First, before initial use, we need to thoroughly clean the lunch box. Although new lunch boxes may have undergone some cleaning during manufacturing, they may still accumulate dust or bacteria during transportation and storage. Therefore, it's best to carefully wash the interior and exterior with warm water and neutral detergent before first use. During cleaning, avoid using steel wool or hard brushes to prevent scratching the surface and affecting thermal performance. Also ensure all components like lids and sealing rings are thoroughly cleaned.

After cleaning, we should perform pre-heating or pre-cooling treatment. This step helps the insulation layer gradually adapt to temperature changes, thereby improving thermal performance. For winter use, pour hot water into the lunch box, cover it, and let it cool naturally to room temperature before pouring out the water. For summer use, perform the opposite with cold water. This treatment can enhance the lunch box's insulation effect.

Next, we can start using the lunch box for meals. When packing food, avoid pouring overly hot food directly into the container to prevent burns or damage to the insulation layer. Let food cool slightly to appropriate temperature before packing. Also try to avoid packing foods with excessive gravy to prevent leakage during transport.

Additionally, during use, note the following points: First, avoid prolonged exposure to high temperature or humid environments to maintain thermal performance and material longevity; Second, clean regularly to prevent food residue and bacterial growth; Third, handle gently during transport to avoid impacts or drops that may damage the lunch box or affect its thermal performance.

It's worth noting that material selection is crucial for office portable insulated lunch boxes. High-quality lunch boxes typically use food-grade stainless steel or glass materials that are not only safe and non-toxic but also offer good thermal retention and durability. Therefore, when purchasing, choose reputable brands and quality products.

In conclusion, first-time use of a new office portable insulated lunch box requires attention to cleaning, pre-heating/cooling treatment, proper food packing, and daily usage precautions. Only by following these guidelines can we ensure optimal thermal performance and longevity, allowing the lunch box to serve us best in our work life.