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

Dicipta 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.
Pertengahan
3 hours plus an overnight soak

Arahan

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.
Fail Reka BentukBLENDCC0 - Free
Muat turun 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.

Bahan untuk langkah ini:

Paip PVC Lut SinarPaip PVC Lut Sinar1 keping
Set Gelang OSet Gelang O1 kit

Alatan diperlukan:

Gergaji BesiGergaji Besi
Kertas PasirKertas Pasir
Angkup Digital 6 InciAngkup Digital 6 Inci
3

Size the groove

Memuatkan buku nota 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.

Bahan untuk langkah ini:

Rod Delrin/asetalRod Delrin/asetal1 keping

Alatan diperlukan:

Mesin Pelarik LogamMesin Pelarik Logam
Set mata larik (HSS)Set mata larik (HSS)
Angkup Digital 6 InciAngkup Digital 6 Inci
Cermin Mata Keselamatan JernihCermin Mata Keselamatan Jernih
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.

Alatan diperlukan:

Pahat pemotong pelarikPahat pemotong pelarik
Mesin Pelarik LogamMesin Pelarik Logam
Angkup Digital 6 InciAngkup Digital 6 Inci
6

Part off, make the second

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

Bahan untuk langkah ini:

Rod Delrin/asetalRod Delrin/asetal1 keping

Alatan diperlukan:

Pahat pemotong pelarikPahat pemotong pelarik
Mesin Pelarik LogamMesin Pelarik 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.

Bahan untuk langkah ini:

VaselinVaselin2 g
Tuala kertasTuala kertas1 helaian
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.

Alatan diperlukan:

BaldiBaldi
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

Alatan Diperlukan

8

Fail reka bentuk

1

Blueprint berkaitan

Blueprint ini berkongsi pengetahuan — teknik, bahan atau prinsip

Neoprene

Neoprene

oleh TexFO

Jahitan

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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

oleh CharlieDE

Industri

81
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CC0 Domain Awam

Blueprint ini dikeluarkan di bawah CC0. Anda bebas menyalin, mengubah, mengedar, dan menggunakan karya ini untuk sebarang tujuan, tanpa meminta kebenaran.

Sokong Pembuat dengan membeli produk melalui Blueprint mereka di mana mereka memperoleh Komisen Pembuat ditetapkan oleh Penjual, atau cipta iterasi baru Blueprint ini dan sertakan ia sebagai sambungan dalam Blueprint anda sendiri untuk berkongsi hasil.

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