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Nitrile Rubber (Buna-N)
R. Henrik Nilsson (Wikimedia Commons) · CC BY 4.0
Martin

Imeundwa na

Martin

22. Septemba 2026NO
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Nitrile Rubber (Buna-N)

At IG Farben in 1930 Erich Konrad and Eduard Tschunkur copolymerised butadiene with acrylonitrile. The nitrile group makes the chain polar, so oil and petrol - which are not - stay out. Sold as Buna N, nitrile rubber became the standard material for oil seals, fuel hoses and, much later, disposable gloves. **US 1,973,000**, "Rubber like masses from butadiene hydrocarbons and polymerizable nitriles", Konrad and Tschunkur, assigned to IG Farbenindustrie, filed 20. April 1931, granted 11. September 1934. It requires the butadiene to be more than about 60 % by weight of the mix. **You build the part nitrile made universal: an O-ring seal.** Turn two plugs with sized grooves, close a clear pipe with them, and leave it under water overnight.
Kati
3 hours plus an overnight soak

Maagizo

1

The plug

One turned acetal plug: a flange that stops against the pipe end, a spigot that fits the bore, and a groove carrying the O-ring.
Faili ya UsanifuBLENDCC0 - Free
Pakua modeli
2

Measure and choose

Cut 150 mm of clear PVC pipe and deburr both ends. Measure the bore at three angles and average. Pick a nitrile O-ring about 3 mm thick whose inside diameter is a little under bore minus 5 mm.

Vifaa kwa hatua hii:

Bomba la PVC AngavuBomba la PVC Angavu1 kipande
Seti ya Pete za OSeti ya Pete za O1 kifaa

Zana zinazohitajika:

Msumeno wa chumaMsumeno wa chuma
Sandarusi (karatasi ya kusugua)Sandarusi (karatasi ya kusugua)
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
3

Size the groove

Inapakia daftari la Jupyter…
4

Turn the spigot

Chuck acetal rod. Face it. Turn 12 mm of length to the bore minus 0.1 mm, leaving a 5 mm flange at full pipe outside diameter behind it.

Vifaa kwa hatua hii:

Fimbo ya Delrin/asetaliFimbo ya Delrin/asetali1 kipande

Zana zinazohitajika:

Kereza ya ChumaKereza ya Chuma
Seti ya zana za lathe (HSS)Seti ya zana za lathe (HSS)
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
Miwani ya usalama iliyo waziMiwani ya usalama iliyo wazi
5

Cut the groove

3 mm from the spigot's end, plunge the parting tool to the root diameter from the notebook, then widen to 4.0 mm. Check the root with the caliper. Break the sharp edges.

Zana zinazohitajika:

Patasi ya kukata kaziPatasi ya kukata kazi
Kereza ya ChumaKereza ya Chuma
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
6

Part off, make the second

Part off behind the flange. Make a second identical plug.

Vifaa kwa hatua hii:

Fimbo ya Delrin/asetaliFimbo ya Delrin/asetali1 kipande

Zana zinazohitajika:

Patasi ya kukata kaziPatasi ya kukata kazi
Kereza ya ChumaKereza ya Chuma
7

Grease and fit

Wipe a thin film of petroleum jelly on each O-ring and roll it into its groove without twisting. Put a folded dry paper towel in the pipe and press both plugs home.

Vifaa kwa hatua hii:

VaseliniVaselini2 g
Karatasi ya jikoniKaratasi ya jikoni1 karatasi
8

Overnight under water

Weigh the capsule down in a bucket of water for 12 hours. Dry it outside, open it, and check the towel. Any damp spot shows which end leaked.

Zana zinazohitajika:

NdooNdoo
9

History & Context

**What the patent specifies:** a butadiene hydrocarbon (over about 60 % by weight) polymerised with a polymerisable nitrile, by heating or in emulsion. **Modern build (derived):** commercial NBR O-rings in an acetal gland. Wartime Germany needed a rubber that fuel could not ruin, and nitrile answered it. More nitrile in the chain means more oil resistance and less flexibility in the cold. Its limits: ozone and sunlight crack it, and it swells in brake fluid and many solvents.

Vifaa

5

Zana Zinazohitajika

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Faili za muundo

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Neoprene

Neoprene

na TexFO

Kushona

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Vulcanizing Rubber with Sulfur — The Accidental Discovery That Put Tyres on the Road

Vulcanizing Rubber with Sulfur — The Accidental Discovery That Put Tyres on the Road

na CharlieDE

Viwandani

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