1,3-Butadiene
The key monomer for synthetic rubber — styrene-butadiene rubber (SBR), polybutadiene rubber (PBR) and nitrile rubber — and for ABS engineering resin.
Chelora Chemicals supplies 1,3-butadiene to tyre, rubber and resin manufacturers worldwide, with inhibitor-stabilised, pressurised handling and full documentation on every consignment.
Product identity
- CAS Number
- 106-99-0
- IUPAC name
- Buta-1,3-diene
- Molecular formula
- C₄H₆
- Molecular weight
- 54.09 g/mol
- Boiling point
- -4.4 °C
- Melting point
- -108.9 °C
- UN Number
- UN 1010
- HS Code
- 2901 24
Note: Butadiene is a liquefied gas at ambient temperature and is shipped inhibitor-stabilised to prevent peroxide formation and popcorn polymerisation. Confirm requirements with your regulatory affairs team.
What Butadiene is used for
1,3-Butadiene is a colourless, flammable gas with a mild aromatic odour, handled and shipped as an inhibitor-stabilised liquefied gas. It is recovered mainly as a C4 co-product of ethylene steam cracking, separated from the mixed C4 stream by extractive distillation.
Butadiene's single largest use is as the monomer for synthetic rubber — polymerised alone into polybutadiene rubber (PBR), or copolymerised with styrene into styrene-butadiene rubber (SBR) and with acrylonitrile into nitrile rubber (NBR) — consumed mainly by the tyre industry. It is also a co-monomer in ABS resin and a feedstock for adiponitrile and other nylon-chain intermediates.
Where it sits in the petrochemical value chain
- Ethylene steam cracking the source of the mixed C4 stream that butadiene is extracted from.
- 1,3-Butadiene (this product) the diene monomer for the rubber and resin chains below.
- SBR / PBR / NBR / ABS downstream rubber and resin polymers built on this monomer.
Handling character
Butadiene is extremely flammable, a suspected human carcinogen, and prone to peroxide formation without adequate inhibitor. Full hazard detail is in the Safety section below.
| Parameter | Typical value |
|---|---|
| Appearance | Colourless liquefied gas |
| Assay | 99.5% min (polymer grade) |
| Dimer/peroxide content | Within producer specification |
| Inhibitor (TBC) content | Within producer specification |
Important: the figures above are indicative of commercial material and are offered for planning only. The batch certificate of analysis is the governing document.
| Property | Value |
|---|---|
| Physical state | Liquefied gas under pressure at ambient temperature |
| Boiling point | -4.4 °C |
| Melting point | -108.9 °C |
| Density (liquid) | 0.621 g/cm³ |
| Water solubility | Slightly soluble (~735 mg/L) |
| Flash point | -76 °C (extremely flammable) |
Physical constants compiled from public reference data for CAS 106-99-0 and rounded for readability. Treat them as orientation, not as a specification.
Where our customers put Butadiene to work
The diene behind tyres, footwear latex and impact-resistant engineering plastics.
Styrene-butadiene rubber (SBR)
Copolymerised with styrene into SBR, the dominant rubber for tyre tread compounds.
- Polymer-grade specification
- Pressurised bulk supply
- Technical desk review on request
Polybutadiene rubber (PBR)
Polymerised alone into high-resilience polybutadiene rubber for tyre sidewalls and golf balls.
- Industrial-grade specification
- Documented batch traceability
- Contract & spot supply
ABS resin
Copolymerised with styrene and acrylonitrile into impact-resistant ABS engineering plastic.
- Full analytical documentation available
- Retained sample held against the lot
Nitrile rubber (NBR)
Copolymerised with acrylonitrile into oil-resistant nitrile rubber for seals, hoses and gloves.
- Documented batch traceability
- Technical desk review on request
Latex & footwear
Used in SBR latex for carpet backing, paper coating and footwear sole compounds.
- Research & process-scale quantities
- Full documentation supplied
Contract & scheduled supply
Rubber and resin plants running continuous consumption are supported with scheduled bulk delivery.
- Annual contracts with scheduled call-off
- Price held across the contract period
- Second source held in reserve
How we supply 1,3-Butadiene
Chelora Chemicals is a supplier and sourcing partner, not a manufacturer. Butadiene's peroxide-formation tendency and pressurised handling make inhibitor level and logistics control critical — that shapes how we manage this line.
We place your order with whichever qualified producer best matches your required grade, your price point and your delivery window, and confirm your jurisdiction's import requirements before booking.
We keep a second qualified source on this line, so a single-plant disruption never becomes your production problem.
- Inhibitor and dimer/peroxide levels confirmed before we quote. Consistency matters to downstream SBR, PBR and NBR polymerisation.
- UN 1010 documentation managed end to end. Classification, pressurised packaging approval and carrier compliance confirmed before booking.
- Scheduled call-off scheduling. We hold contracted tonnage and release it against your consumption calendar.
- Batch traceability to the producing plant. Full chain of custody documentation on request.
- Export machinery handled in-house. Classification, approved pressurised packaging, labelling, freight booking and customs paperwork are ours to manage.
- Polymer-grade material sourced to your process. Matched precisely to your SBR, PBR, NBR or ABS specification.
Shipped under pressure, handled with care
Pressurised cylinder, ISO tank or rail tanker — tell us your preferred format and we will quote and classify to it.
Pressurised cylinders
Steel pressure cylinders, inhibitor-stabilised, for small-volume orders and trial quantities.
Pressurised ISO tank shipment
ISO tank containers rated for liquefied-gas transport, for continuous-consumption rubber and resin plants.
Bulk tanker delivery
Pressurised rail cars or road tankers for large-volume domestic and regional delivery.
Incoterms to suit you
Quoted on the Incoterm your purchasing team works to, with documentation filed before booking.
Trial / sample quantities
Small pressurised packs dispatched for process trials before a commercial order is placed.
Contracted call-off supply
We hold contracted tonnage and release it against your consumption calendar.
May cause cancer — handled under strict controls
Butadiene is both extremely flammable and a suspected human carcinogen, and can form explosive peroxides and popcorn polymer without adequate inhibitor. The summary below is orientation only — the safety data sheet supplied with your specific batch is the authoritative document.
Classified hazards
H220Extremely flammable gas.H280Contains gas under pressure; may explode if heated.H350May cause cancer.
Maintain inhibitor levels at all times. Inadequately inhibited butadiene can form explosive peroxides and popcorn polymer in storage; always read the SDS issued with your specific batch and follow site exposure-control procedures.
Storage
Store inhibited material in pressurised vessels in a cool, well-ventilated, bunded area away from ignition sources, oxidisers and oxygen ingress, with continuous leak detection.
Handling
Handle only in closed systems with appropriate gas detection, forced ventilation and PPE; avoid any inhalation or skin contact, and eliminate ignition sources from the handling area.
Transport
Shipped as UN 1010 (Butadienes, stabilized), an extremely flammable, pressurised, carcinogenic gas. We confirm and document exact classification, approved pressure vessels and routing for your specific shipment and destination.
Every batch, documented
We verify documentation before dispatch so there are no surprises at your incoming-goods bench.
Specification agreed
Assay, dimer/peroxide content and inhibitor level confirmed against your polymerisation route before order placement.
Producer batch testing
The producing plant tests each batch against the agreed specification before release.
Documentation review
COA, SDS and pressurised-transport paperwork checked by our desk before the shipment is booked.
Traceable dispatch
Each shipment is traceable to its producing batch, with full chain-of-custody records on request.
How Butadiene is made
Butadiene is recovered industrially from the mixed C4 stream produced by ethylene steam cracking, separated by extractive distillation using a selective solvent (such as NMP or DMF) that dissolves the diene preferentially over the mono-olefins and paraffins in the C4 cut. On-purpose dehydrogenation of n-butane or n-butene is used where cracker C4 supply is insufficient.
We do not publish operating process parameters here; this is background only. Full technical documentation accompanies every shipment, and any process-specific detail you need is best confirmed directly with our technical desk.
| Chemical family | Conjugated diene |
|---|---|
| Functional groups | Two conjugated carbon-carbon double bonds |
| Reactivity | Free-radical and anionic (co)polymerisation; Diels-Alder diene; forms peroxides with oxygen |
| Related compounds | Ethylene (cracker co-product), SBR, PBR, NBR, ABS (downstream polymers) |
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