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

Nilikha ni

Martin

22. Setyembre 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.
Katamtaman
3 hours plus an overnight soak

Mga Tagubilin

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.
File ng DisenyoBLENDCC0 - Free
I-download ang modelo
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.

Mga materyales para sa hakbang na ito:

Malinaw na Tubong PVCMalinaw na Tubong PVC1 piraso
Sari-saring O-RingSari-saring O-Ring1 kit

Mga kailangang kasangkapan:

Lagaring Pang-metalLagaring Pang-metal
Papel de LihaPapel de Liha
Digital na Kalibrador 6 PulgadaDigital na Kalibrador 6 Pulgada
3

Size the groove

Naglo-load ng Jupyter notebook…
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.

Mga materyales para sa hakbang na ito:

Delrin/acetal na rodDelrin/acetal na rod1 piraso

Mga kailangang kasangkapan:

Torno para sa MetalTorno para sa Metal
Set ng kasangkapan sa lathe (HSS)Set ng kasangkapan sa lathe (HSS)
Digital na Kalibrador 6 PulgadaDigital na Kalibrador 6 Pulgada
Malinaw na Salaming PangkaligtasanMalinaw na Salaming Pangkaligtasan
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.

Mga kailangang kasangkapan:

Panghiwang pait sa pagliliyokPanghiwang pait sa pagliliyok
Torno para sa MetalTorno para sa Metal
Digital na Kalibrador 6 PulgadaDigital na Kalibrador 6 Pulgada
6

Part off, make the second

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

Mga materyales para sa hakbang na ito:

Delrin/acetal na rodDelrin/acetal na rod1 piraso

Mga kailangang kasangkapan:

Panghiwang pait sa pagliliyokPanghiwang pait sa pagliliyok
Torno para sa MetalTorno para sa Metal
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.

Mga materyales para sa hakbang na ito:

BaselinaBaselina2 g
Papel na pantuyoPapel na pantuyo1 pilyego
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.

Mga kailangang kasangkapan:

BaldeBalde
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.

Mga Materyales

5

Mga Kinakailangang Kasangkapan

8

Mga design file

1

Kaugnay na Blueprint

Ang mga blueprint na ito ay nagbabahagi ng kaalaman — mga teknik, materyales, o prinsipyo

Neoprene

Neoprene

ni TexFO

Pananahi

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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

ni CharlieDE

Industriyal

81
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CC0 Pampublikong Domain

Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.

Suportahan ang Maker sa pamamagitan ng pagbili ng mga produkto sa kanilang Blueprint Komisyon ng Maker itinakda ng mga Vendor, o lumikha ng bagong bersyon ng Blueprint na ito at isama bilang koneksyon sa iyong Blueprint upang ibahagi ang kita.

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