In cold weather, keeping the feet warm is very important. With the development of the times, many thermal products have appeared in recent years, among which the foot warmer is the most popular. The principle of warm foot paste is to use redox reaction to convert chemical energy into heat energy. In addition, the foot warmer is also very convenient. After removing the package, stick it on the body and wait for a minute or two to heat up. So, are foot warmers dangerous? Where is the best place for foot warmers? Is it usually on the sole of the foot or the instep? Come and find out with me.
Are foot warmers harmful?
The main ingredients of general foot warmers are toner and other heat-generating substances, which stimulate sweating and heat through the chemical reaction of the drug pack, while the plastic film seals the heat to achieve the purpose of heating, and generally does not penetrate into There is no other harm to the skin. But I need to remind everyone here that it is recommended not to use the foot warmer for a long time or multiple times to avoid safety accidents.
The heating principle of the foot warmer
The reaction principle is also to use the redox reaction to convert chemical energy into heat energy. In order to make the temperature last longer, the product uses the mineral material vermiculite to keep warm, and more importantly, allows oxygen to enter slowly, so the material of the charging bag should be very special, from the raw material layer, gelatin layer, It is composed of breathable film and non-woven bag. The non-woven fabric should be attached with a layer of microporous breathable membrane. In addition, there must be a conventional airtight outer bag – commonly known as a plastic bag. When in use, tear open the outer bag and expose the inner bag (non-woven bag) to the air, and the oxygen in the air enters the inside through the breathable membrane. The time and temperature of heating are controlled by the oxygen transmission rate of the breathable membrane. If the oxygen intake is too much, the reaction will quickly release the heat, and it may burn the skin. If the oxygen permeation is too slow, the reaction will be slow, and the heat will be less, and there will be no temperature. After use, it is a reddish brown solid, which contains carbon powder, NaCl solid, Fe3O4 solid and salts.
How do warmers work>>
Where are the foot warmers
Foot warmers are great for keeping your feet warm and keeping them warm during outdoor activities. Generally attached to the feet, the soles and insteps can be attached.
Before use, open the inner bag, peel off the release paper, and stick it directly to the front of the sole without rubbing (avoid using it directly on the skin or affixed to the shoe). When using raw products, wear shoes that are the correct size. If the breathability of the shoes is poor and the temperature of the warmer pads drops, you can take off the shoes for a while to let the air circulate, and the warmer pads can be warmed up.
When storing the foot warmers, avoid direct sunlight and store them in a cool place out of the reach of children.
Precautions for foot warmers
1. Children, diabetics, pregnant women, sensitive skin and people with disabilities should use it with care.
2. For pregnant women, if the sticking part is facing the uterus, it is likely to cause uterine contractions, resulting in fetal malformation and premature birth.
3. The baby’s skin is very tender and less active to prevent low temperature burns.
4. People with diabetes and blood circulation disorders, people with low skin heat sensitivity, should pay attention when using it.
5. Stick it on the outside of the underwear, do not stick it directly on the human skin to prevent scalding the skin or cause allergic reactions (except for the muscle sticking type), please avoid using it in the same position for a long time, and pay attention to confirm the approval status , if there is any abnormality, remove it immediately.
6. It should not be used when sleeping at night. When used in bed or with heating equipment, the temperature will rise, so be careful to prevent low temperature burns.
7. Avoid damage or damage to the vacuum plastic packaging bag, otherwise the product will fail.
8. In case of accidental contact with eyes, rinse immediately with water and seek medical attention. If swallowed, induce vomiting and seek medical attention immediately.
9. The foot warmer must not be directly attached to the skin, which will easily cause burns. When using the foot warmer, be sure to wear socks and choose shoes with good ventilation to prevent your feet from being scalded. scald. Can pregnant women use heating pads>>
Under what circumstances can not use foot warmers
1. When the foot warmers bulge, don’t use them again. There are two types of foot warmers that will bulge. The reasons are: one is that the outer packaging has loopholes, and the other is that the product is unqualified. No matter which case, it is not suitable for use again. Otherwise, when it comes into contact with the air during use, accidents may occur.
2. When the storage time is too long, the foot warmer has become hard, or the non-woven packaging of the foot warmer has loopholes, and the internal material leaks, I suggest that you should not use it again. Prevent security incidents from happening.
