6 samples of hand warmer packs were tested to simulate the environment of daily use. The maximum temperature of one sample could reach 82.1°C.
Experimental samples: 6 types of hand warmer packs from different brands, each marked with ABCDEF; CNC pen thermometer; two pieces of steak; 6 eggs.
Experimental purpose: to test the temperature changes of hand warmer packs samples within 8 hours; and the impact of hand warmer packs attached to eggs and steaks.
(The results of this experiment are only responsible for the experimental samples)
As winter approaches, many people like to use small and lightweight hand warmer packs to keep warm. However, some netizens reported that some children and young people suffered minor burns when using hand warmer packs (hereinafter referred to as "hand warmer packs").
What is the maximum temperature that hand warmer packs attached to clothes can reach? Recently, the reporter purchased 6 hand warmer packs samples through online stores and physical stores, and used a thermometer to detect the temperature changes of various hand warmer packs samples within 8 hours. The test results showed that the maximum temperature of one sample reached 82°C, and an obvious burning sensation could be felt when touched by hand.
At the same time, in order to compare and test the possible harm caused by high temperature, the reporter attached hand warmer packs to raw eggs and steak meat to observe the changes before and after the food. The experimental results show that among the 6 hand warmer packs samples, 2 hand warmer packs can boil eggs into "soft-boiled eggs"; the surfaces of both sides of raw steak become cooked. The reporter noticed that the samples of hand warmer packs that scald eggs and steak meat were all produced by unknown manufacturers. The maximum temperature shown in the test was significantly higher than that of regular brand hand warmer packs.
Experts say that human skin may be scalded if it comes into contact with objects exceeding 70°C; and if hand warmer packs are used for a long time, there is also a risk of low-temperature burns.
The reporter used 6 types of hand warmer packs to wrap raw eggs and observed the changes in the eggs after 1 hour.
Experiment 1
When a hand warmer pack is placed in clothing, the temperature exceeds 80°C.
Experimental process: Take out one piece of the six hand warmer packs samples in sequence, open the package, wrap the detection needle of the CNC pen thermometer with a cloth, and observe the temperature change on the thermometer display. Then, place the thermometer in the clothes to simulate the environment of normal use of hand warmer packs and observe the temperature.
During the experiment, the temperature changes of the hand warmer packs samples were recorded within 30 minutes, 1 hour, 2 hours, 4 hours, and 8 hours.
Experimental results: The experimental results show that the temperature of the six hand warmer packs samples when they first wrapped the thermometer was about 25°C; after half an hour, the temperature rose to about 40°C; after 1 hour, the temperature of several hand warmer packs samples There are obvious differences in the temperature. Among them, the temperature of three hand warmer packs samples is about 52℃; the temperature of the other three types is about 60℃.
After 2 hours, the temperatures of samples A and B exceeded 70°C, with A reaching 75°C and B reaching 71.7°C.
From 3 hours to 8 hours into the experiment, the temperatures of the six hand warmer packs samples gradually decreased and remained between 40°C and 50°C, with some temperature changes.
In an environment simulating daily use, the experimental results show that after testing for about two hours, among the six hand warmer packs samples, the highest temperature of sample A can reach 82.1°C.
Experiment 2
Two samples of hand warmer packs can scald raw eggs until half cooked.
Experimental process: Wrap raw eggs in 6 types of hand warmer packs respectively. Use one piece of large hand warmer packs to wrap the eggs, and use two pieces of small hand warmer packs to wrap the eggs. Then, six raw egg samples were wrapped in a piece of clothing to simulate the temperature environment of hand warmer packs in human clothing. Wait 1 hour and observe the changes in the raw eggs.
Experimental results: After 1 hour, 6 eggs were taken out of the clothes. When touching the eggs with hands, they felt obviously hot. The reporter then used a knife to cut six eggs in the middle and found that the two eggs wrapped in hand warmer packs samples A and B had turned into half-cooked "soft-boiled eggs"; the egg whites and yolks of the other four eggs were somewhat raw.
After a piece of beef sample was stuck with hand warmer packs for 1.5 hours, most of it turned dark red when cut open.
Experiment 3
The beef slices will be blanched deep red after 1.5 hours.
Experimental process: Put 2 steak slices bought from the supermarket into a clean fresh-keeping bag.
Subsequently, two hand warmer packs with higher heating temperatures during the above experiment were selected, and two pieces were attached to the front and back of the beef slices. Place beef slices under a pillow and observe changes in the sample.
Experimental results: After 1.5 hours, a meaty aroma wafted out from under the pillow. After taking out the beef sample with hand warmer packs attached, the reporter found that a small amount of blood flowed out of the two fresh-keeping bags; and the color of the beef slices in the fresh-keeping bags had changed from bright red to deep red.
Expert voice
If the temperature exceeds 70℃, the skin may be burned.
In the experiment, one of the hand warmer packs reached a maximum temperature of over 80°C after being heated. What harm does this temperature do to human skin? In this regard, Wang Dan, a dermatologist at the Beijing Military Region General Hospital, said that under normal circumstances, if the temperature exceeds 70°C, there is a risk of skin burns. At the same time, the degree of burns caused by hand warmer packs to the skin also varies depending on the location of the patch and the heating capacity of the hand warmer packs.
The reporter consulted public information and learned that burns are generally divided into three levels: first degree (mild), second degree (moderate), and third degree (severe). First-degree burns are characterized by local slight redness and swelling, obvious pain, and no blisters; Second-degree burns are characterized by blisters, which have damaged the subcutaneous tissue and may cause infection; third-degree burns are characterized by severe discoloration and deformation of the skin. Under normal circumstances, if the temperature exceeds 75°C, the skin may be scalded in half a minute; if the temperature reaches 70°C, the skin will be scalded in one minute; and if the temperature is 60°C, the skin will be scalded in about 5 minutes.
Will low temperature burn the skin? According to a dermatology expert, when the temperature of hand warmer packs is between 50°C and 60°C for a long time, although the human skin will not feel strong pain when it first comes into contact, it will still cause pain because the local heat cannot be dissipated in time. Burning the skin is often referred to as low-temperature burns.
It is best for diabetic patients not to use hand warmer packs.
What should you pay attention to when using hand warmer packs? According to the above-mentioned experts, hand warmer packs should not be in direct contact with the skin. Try to stick them on the close-fitting clothes inside the coat. If they feel hot, take them off as soon as possible or change their position. Before going to bed, try not to use hand warmer packs, because the human body's ability to sense temperature decreases during sleep, and there may be a risk of burns.
At the same time, it is best not to use hand warmer packs for diabetics and alcoholics, because the skin of these people is relatively slow in sensing temperature. If they feel hot when using hand warmer packs, they may have burned their skin.
Experts remind that there are many types of hand warmer packs on the market, and there are also many pirated products with uneven quality. When purchasing, it is best for citizens to buy well-known regular brand hand warmer packs, and check whether the outer packaging is intact and whether there are any Leakage, caking, etc. If you find any abnormalities, it is best not to buy.