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

Dibuat oleh

Martin

22. September 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.
Menengah
3 hours plus an overnight soak

Instruksi

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.
Berkas desainBLENDCC0 - Free
Unduh model
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.

Material untuk langkah ini:

Pipa PVC BeningPipa PVC Bening1 buah
Set Aneka Cincin OSet Aneka Cincin O1 kit

Alat yang dibutuhkan:

Gergaji BesiGergaji Besi
AmplasAmplas
Jangka Sorong Digital 6 InciJangka Sorong Digital 6 Inci
3

Size the groove

Memuat notebook 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.

Material untuk langkah ini:

Batang Delrin/asetalBatang Delrin/asetal1 buah

Alat yang dibutuhkan:

Mesin Bubut LogamMesin Bubut Logam
Set pahat bubut (HSS)Set pahat bubut (HSS)
Jangka Sorong Digital 6 InciJangka Sorong Digital 6 Inci
Kacamata Pengaman BeningKacamata Pengaman Bening
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.

Alat yang dibutuhkan:

Pahat potong bubutPahat potong bubut
Mesin Bubut LogamMesin Bubut Logam
Jangka Sorong Digital 6 InciJangka Sorong Digital 6 Inci
6

Part off, make the second

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

Material untuk langkah ini:

Batang Delrin/asetalBatang Delrin/asetal1 buah

Alat yang dibutuhkan:

Pahat potong bubutPahat potong bubut
Mesin Bubut LogamMesin Bubut Logam
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.

Material untuk langkah ini:

VaselinVaselin2 g
Tisu dapurTisu dapur1 lembar
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.

Alat yang dibutuhkan:

EmberEmber
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.

Bahan

5

Alat yang Diperlukan

8

Berkas desain

1

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CC0 Domain Publik

Cetak biru ini dirilis di bawah CC0. Anda bebas untuk menyalin, memodifikasi, mendistribusikan, dan menggunakan karya ini untuk tujuan apa pun, termasuk komersial, tanpa meminta izin.

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