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NBR O-Ring Latest Research Result 2014-02-17
NBR O-Ring is made of black Buna-nitrile (Buna-N) and has a durometer of 50A. NBR O-Ring has a round cross-section and can be used across a wide temperature range (-30 degrees F/-34 degrees C to 250 degrees F/121 degrees C). Designed for use in a wide variety of sealing applications, this Buna-nitrile O-ring meet standards defined by Aerospace Standard AS568A, which is the Aerospace Size Standard for O-rings.Buna-nitrile can have high tensile strength, as well as abrasion, tear, and compression set resistance. Rubber O-Ring is compatible for use with petroleum, hexafluoroacetone (HFA), hexafluoro-2-butyne (HFB) and hydrofluorocarbon (HFC) fluids, vegetable oil, alcohol, acids, and aliphatic hydrocarbons. Buna-nitrile is vulnerable to acetone, ethers, esters, ozone, sunlight and weathering, and should not be used in ozone-generating electric motors, welding equipment, or in applications with exposure to UV light.
The durometer hardness of this Buna O-ring is 50A. Durometers measure the hardness of a material and its resistance to permanent indentation. A higher durometer value indicates greater resistance to indentation. On a scale of 0 to 100, a value of 0 indicates that a sample was completely penetrated, while a value of 100 shows no indentation in the sample. The letter following the number identifies the shore scale, which is either shore A or D. Shore A is used for softer plastics, while shore D is used for harder plastics.
O-rings provide a pressure and fluid seal between cylindrically shaped, overlapping mating surfaces and are commonly seen in engines, faucets, flanges, valves, and various cylinders. They are circular in shape, with a round cross section, and a hole in the center, similar to a doughnut. O-rings are available in various AS568A dash sizes, which is the standardized sizing for O-rings, and defines the nominal inside diameter (ID), outer diameter (OD), and cross-sectional (CS) diameter of an O-ring.
These Rubber O-Ring, as made evident in other reviews, are to help either quiet or lower the travel distance of a mechanical keyboard (or both). I put these on my full sized keyboard with cherry mx black switches.
You get the quoted amount in the package and none were made poorly or broken or anything. Each one fit on the key cap stem perfectly. Installing these is quite a breeze really as long as you make sure you read how to pull off a key with a stabilizer bar (space bar, enter keys, etc. have these). You get more than necessary for even a full sized board so if one does break or gets lost or falls between something you can't get, you're covered.
The value on these puppies is awesome. They are approximately half the price of other places - I suppose you could go cheaper and make your own but that seems so time consuming as to be absurd. Also, you can easily install these yourself so don't waste money on that - a mechanical keyboard is meant to be taken apart and put back together easily.
Edit 6/25/13 - This addition is to simply let you know that I've found another use for these in the computer world. I used them to dampen the sound/vibration on case fans for my computer. It's just wide enough to let the screw through and enough to thickness to help keep it marginally quieter. Given the pack I got had many extras, I put 1 of each of these wherever a screw and fan met in my case that I could. Just awesome.