Nitrile gloves, as to understand their diversity?

Nitrile working gloves, as to understand their diversity?
Currently, the market has a lot of work gloves coated with nitrile from different manufacturers.

In the EU, gloves sold 2 categories:
A. Lowest 2.Vysshaya
Assigned to the second glove (highest) category only after successful completion of testing. The test results are applied to the product.
If the glove do not have numbers, characterizing the degree of protection, so these gloves are the first category.

In accordance with European standard EN388 mechanical stability above all we must pay attention to the markings. More precisely, the presence of 4-digit, standing near the sign "protection from mechanical damage," characterizing the degree of protection to: abrasion, cut, stretch, puncture.

The protective properties of mechanical stress are indicated by EN388, and four digits underneath, denoting:

The values ​​of the exponent 1 2 3 4 5
A Abrasion (cycles) 100 500 2000 800 -
Cuts in the (number) 1.2 2.5 5.0 10.0 20.0
With the gap (Newton) 10 25 50 75 -
Punctures D (Newton) 20 60 100 150 -

The higher the number, the greater the protection for this indicator.

The protective properties of chemical resistance are indicated by an icon EN347, without the numbers below. Under the symbol marks indicate basic chemicals from which the defend gloves.

The icon marks the protective properties of working gloves.

Protection against mechanical damaging factors (EN 388) Levels of use
0 w4 - resistance to abrasion
from 0 to 5 - resistance to cuts
from 0 to 4 - Resistance to tearing
from 0 to 4 - Resistance to puncture

Protection against high temperatures or open flame (EN 407) Levels of use
0 w4 - resistance to fire in an open flame
from 0 to 5 - on the contact resistance
from 0 to 4 - resistance to convection heat
from 0 to 4 - Resistance to radiant heat
from 0 to 4 - Resistance to small splashes of molten metal
from 0 to 4 - resistance to molten metal splash

Protection from exposure to specific chemicals (EN374) A - Methanol
B - Acetone
C - Acetonitrile
D - dichloromethane
E - carbon disulfide
F - Toluene
G - Diethylamine
H - tetrahydrofuran
I - Ethyl Acetate
J - n-Heptane
K - sodium hydroxide 40%
L - Sulfuric acid 96%

Protection against cold (EN 511) Levels of use
0 w4 - resistance to conventional cold
from 0 to 4 - to the contact resistance
from 0 to 4 - waterproof