When talking about gloves and their quality, two standards stand out: EN388 (see) and EN 407. The first certifies the cut resistance of the material, the second the heat resistance. Take a look at EN 407 with 7 easy steps.
Gloves have a limit
Many heat-resistant gloves are resistant to high temperatures. However, no gloves provide 100% complete protection, especially when in direct contact with fire. Therefore, it is important to keep in mind that gloves are designed to work in hot environments and to touch hot tools. The EN 407 standard specifies the degree and durability of these gloves.
Signs and meanings
The EN 407 standard is marked with a small flame mark on the back of the gloves and numbers below. Each number has its meaning. The sequence is as follows:
Molten metal splashes (small drops)
Molten metal (in large quantities)
There are 0 to 4 grades for each category. Sometimes it is displayed as "N / A" if there are no tests in a certain category. Many specialized gloves may not require some test results.
What is a burning behavior test?
One of the most frequently cited EN 407 tests is the burning test. Several other tests also refer to this test. For example, even if the “contact heat” and “convective heat” heating tests achieve high results, these rates are also recorded if the “burning behavior” tests results are high enough. It doesn't seem to matter how much heat you can handle, if you burn down easily, huh?
Burning behavior test is performed according to the table below. The main criterion here is how long it takes for it to return to its previous temperature and cool down after direct contact with fire and ignition.
Heat transfer and heat resistance
A glove can be highly heat resistant and can also transmit that heat to the user. Even if the hands do not burn, the situation is quite disturbing. For example, in pottery, baking, and other fields, it is often necessary to touch hot objects. In this case, the results of the "contact heat" and "convective heat" tests are important. "contact heat" is the ability to touch a hot object for 15 seconds. Its temperature should be between 100 ° and 500 °. "convective heat" refers to how late the glove warms indirectly, not directly. The lowest time is 4 seconds and the highest is less than 18 seconds.
External heat effects
"Radiant heat" means not only sunlight but also other heat-carrying rays. There are some environments where rays and other side effects also emit heat. Heat-resistant gloves should be able to withstand such heat sources for 5 to 150 seconds.
One of the most widely used areas of heat-resistant gloves is montage and welding. Those times the glove's resistance to small drops of molten metal is very important. Therefore, there are two "Melted Metal Durability" tests. The first is based on the number of small drops (5-35), and the second is based on the weight in grams (30 g - 200 g).
The best glove is the most suitable glove
In the EN 407 standard, getting only the highest result is a great success for a glove. But it doesn`t make these gloves 100% suitable for you and the work you do. Some tests and results are for specific areas only. Also, a high result means that the material is slightly thicker and less elastic. This itself can slow down what you do. To select the appropriate heat-resistant gloves, calculate the work you do and the appropriate thermal hazards. By categorizing these hazards, you can easily find gloves with a similar EN 407 standard.
EN 407 standard is valid if:
Thermal conductivity depends on the material and its form of processing. The EN 407 standard is only 100% valid when the integrity of the glove is maintained. In other cases, performance may decline or become completely useless. Before using heat-resistant gloves, make sure of the following:
No burn marks
No cut or punctured
The surface is not significantly eroded
No deformation, hardening, or bending.
It is clean and dry.
Once you are sure of this, you can easily use your heat-resistant gloves under EN 407 standard.