Razor blades are often categorized based on their quality, performance and user experience. User experience varies based on the skin type and beard type. http://www.shaverinfoformen.com/best-double-edge-razor-blades/ No matter what, the overall experience and quality of a blade depends on its manufacturing characteristics. The manufacturing characteristics include the type of material used, edge ground and coating if any. All these characteristics contribute to the effectiveness of the blade. Harsh blades cause allergies and burns, http://www.dermalinstitute.com/uk/library/16_article_When_Razor_Meets_Skin_A_Scientific_Approach_to_Shaving.html lists out some of the difficulties of razor on skin.
The blades were studied under scanning electron microscope and results showed that even slight variations in the make and design of the blade can greatly impact its performance.
Edge grinding: The quality of a blade is often judged by its edges. The process is called grinding and the ground blade is marked by striations and furrows. The edges have microscopic ridges and furrows that are characteristic to each manufacturer.
Coating: Most blades are manufactured with a non-stick coating that helps the blade cut easily. These coatings also contribute to the comfort level of shaving. They may also improve the longevity of the blade by retarding oxidation or degradation by environmental factors. The coatings vary in thickness; while some are thin and wavy the others are much thicker.
Metallurgy: Metallurgy refers to the material with which the blade is made and its hardness. There are several grades of metal and it greatly impacts the quality of the blade.
Apart from the make of the blade, the condition in which it is used also affects the user experience. Here are a few of the main factors that impact the effectiveness of the blade.
Water mineral content: Hard water when used for shaving produces less lather compared to soft water and makes shaving a difficult job. Hard water also tends to degrade the material quality of the blade faster.
Thickness of beard: This needs no mention because it is pretty obvious that the blades can easily be used on thin and fine hair as compared to thick and coarse beards.
Shaving product: The quality of shaving will also greatly depend on the soap, cream or gel used. These can also affect the quality of the blade to a great extent.
Well, going for a scanning electron microscope analysis of each and every blade is quite an expensive and time taking affair. So here is our suggestion of the very best blades available in the market. Feather has been suggested as the best blade in most reviews and its quality study also brings us the same results in comparison to other blades. It is built for those that require and aggressive razor, it would be very well avoided by beginners and those with sensitive skin. Polsilver super iridium and Personna too have made it to the top in terms of quality. Merkur and Derby are not preferred by those who are experts at shaving but Derby sure is preferable by those with sensitive skin. As already mentioned, while the quality of the blade depends upon its make, user experience varies from individual to individual.