Stabilized 1,3-Butadiene for Rubber and Plastics

What 1,3-Butadiene Is and Why It Remains a Critical Monomer

1,3-Butadiene, also known as divinyl or vinylethylene, is a conjugated diene hydrocarbon. Under normal conditions it is a colorless liquefied gas with a characteristic hydrocarbon odor and a boiling point of minus 4.4 degrees Celsius. The ability of the molecule to undergo facile polymerization and copolymerization under catalytic action makes butadiene an indispensable building block for large-scale elastomers and impact-resistant plastics. More than 75 percent of global divinyl consumption is directed to rubber synthesis, reinforcing its status as a base feedstock for the tire, mechanical rubber goods and automotive industries.

For industrial procurement teams, 1,3-butadiene is valuable not only as a monomer but also as a chemical intermediate. It is converted to adiponitrile and subsequently hexamethylenediamine for polyamides, to sulfolane and to a range of specialty solvents. The defining feature that shapes the entire supply chain is the tendency of the material to undergo spontaneous exothermic polymerization during storage and transport. Without an inhibitor, divinyl can form peroxides and polymerize with violent rupture of the container, which is why only stabilized material is shipped.

Chemical Identification and Regulatory Data

Unambiguous identification of the product in procurement documents and customs declarations relies on the following data:

• CAS number: 106-99-0 for stabilized 1,3-butadiene.
• Chemical formula: C4H6, structural formula CH2=(CH)2=CH2.
• Molar mass: 54.09 g/mol.
• Synonyms: divinyl, vinylethylene, biethylene, buta-1,3-diene, erythrene.
• UN number: 1010 for stabilized product.
• HS code: determined within heading 2901 for acyclic hydrocarbons; classification for cylinder and bulk shipments is agreed with the customs broker.

In the Russian regulatory framework, the key document is GOST R 55066-2012 Butadiene-1,3. Specifications. The standard covers product intended for the manufacture of synthetic rubbers, latexes, chloroprene and thermoplastic elastomers, establishes grades A and B, quality indicators, sampling methods and safety requirements. For export and import operations, the supplier confirms batch conformity to the technical specification and provides a certificate of quality with actual values for each batch.

Physical and Chemical Properties Relevant to Processing

Understanding the physical constants of divinyl is necessary for selecting transport packaging, calculating temperature regimes and designing dosing units at the production site. The key indicators are summarized below in verbal form without special symbols.

• State: liquefied gas under its own vapor pressure; at atmospheric pressure and room temperature it converts to the gaseous state.
• Boiling point: minus 4.4 degrees Celsius.
• Melting point: minus 108.9 degrees Celsius.
• Liquid density: approximately 0.62 g/cm3 at 20 degrees Celsius.
• Vapor density relative to air: 1.87-1.9; vapors are heavier than air and can accumulate in pits and low areas.
• Vapor pressure: approximately 240 kPa at 20 degrees Celsius, requiring steel cylinders and specialized tank containers rated for elevated pressure.
• Flash point: minus 76 degrees Celsius in a closed cup; the substance is classified as an extremely flammable gas.
• Solubility: practically insoluble in water but miscible with hydrocarbons, ethers, acetone and other organic solvents.

From a processor perspective, two parameters are critical: the narrow interval between boiling point and flash point, which creates a permanent fire load on storage nodes, and the high saturated vapor pressure, which dictates requirements for valves and safety devices.

Technical Grades and Supply Forms

1,3-Butadiene is supplied only in stabilized form. Polymerization inhibitors belong to the class of hindered phenols, most commonly tert-butylcatechol or hydroquinone. Inhibitor content in the commercial product is typically 0.01 percent or higher; during winter periods, shipments with a tert-butylcatechol mass fraction not below the established minimum are permitted to maintain stability at low temperatures.

GOST R 55066-2012 provides for two grades. Grade A is intended for general-purpose synthetic rubbers, including stereoregular polybutadiene and styrene copolymers. Grade B is oriented toward the synthesis of chloroprene and specialty elastomers. For each grade, the mass fraction of the main substance, impurity profile, moisture and inhibitor content are standardized.

Supply forms are determined by the physical properties of divinyl. Small and medium volumes are transported in steel cylinders under pressure, while large-tonnage batches move in rail tank cars or tank containers designed for liquefied gases under pressure or in a semi-refrigerated state. Each packaging unit is leak-tested and equipped with safety valves.

Regulatory Framework for Incoming Inspection

When organizing procurement and acceptance of 1,3-butadiene at the plant, the following set of documents governs quality, safe handling and test methods. Current editions are verified at the time of delivery.

• GOST R 55066-2012 - the primary standard for 1,3-butadiene, establishing technical requirements, acceptance rules and analytical methods.
• GOST 12.1.007-76 - classification of hazardous substances and general safety requirements.
• GOST 12.4.021-75 - requirements for ventilation systems in industrial premises.
• GOST 14921-2018 - sampling of liquefied petroleum gases from tanks and tank cars.
• GOST 27025-86 - general guidance for chemical analysis.
• TR TS 032/2013 - safety of equipment operating under excessive pressure for packaging and valves.

For export batches, ASTM D1060 and ISO standards harmonized with international buyer requirements are additionally applied. The batch specification is formed on the basis of the manufacturer certificate of quality and the results of incoming laboratory control by the recipient.

Mechanism of Action and Functional Role in Polymer Chains

The functional value of 1,3-butadiene is determined by the presence of two conjugated double bonds. During polymerization or copolymerization, the molecule opens one or both bonds and integrates into the macromolecular chain, forming flexible elastomeric segments. Conjugation ensures high reactivity in addition reactions, allowing the process to be conducted across a wide range of conditions and yielding polymers with a controlled distribution of units.

Depending on the catalyst type and the second comonomer, divinyl produces either stereoregular cis-1,4-polybutadiene with high elastic properties and low heat build-up under cyclic deformation, or statistical copolymers with improved compatibility with fillers and oils. Butadiene acts as a structure-forming monomer whose quality determines the entire set of physical and mechanical properties of the final rubber.

Applications by Industry and Process Stage

Tire and Mechanical Rubber Goods Industry

This is the dominant consumer of divinyl. Styrene-butadiene rubber and polybutadiene rubber form the basis of tread compounds, sidewalls and tire carcasses. Tires and tire products account for approximately 70-80 percent of global styrene-butadiene rubber consumption. Polybutadiene is additionally used in high-impact polystyrene and specialty articles.

ABS Plastics and Copolymers

Acrylonitrile-butadiene-styrene copolymers are produced by graft copolymerization of polybutadiene latex with styrene and acrylonitrile. The butadiene unit provides impact strength and low-temperature flexibility, while styrene and acrylonitrile contribute rigidity and chemical resistance. ABS plastics are used in automotive components, household appliances, instrument housings and pipes.

Chloroprene Rubber and Specialty Elastomers

Chlorination of butadiene followed by treatment with sodium hydroxide yields chloroprene, whose polymerization produces neoprene. This material is demanded in articles exposed to oils, fuels and atmospheric agents: hoses, seals and industrial and automotive rubber parts.

Nitrile Rubbers and Latexes

Copolymerization with acrylonitrile yields nitrile-butadiene rubbers characterized by high oil resistance. They are used in hoses, gaskets, seals and latexes for fabric impregnation and glove manufacturing. Styrene-butadiene latexes are used in paper coatings, paints and carpet backing.

Chemical Synthesis and Non-Rubber Applications

Beyond polymers, divinyl serves as a starting material for adiponitrile and hexamethylenediamine in nylon 66 production, for sulfolane as an extraction solvent, and for certain fungicides and anthraquinone dyes. In these processes, high monomer purity and minimal oxygen-containing impurities are essential to avoid inhibiting the target reactions.

Comparison with Alternative Monomers and Materials

When developing new formulations and diversifying the feedstock base, technologists consider partial replacement of 1,3-butadiene with isoprene or combinations of butylene fractions followed by dehydrogenation in the cycle. Isoprene provides higher vulcanization speed and cohesive strength but lags behind divinyl in the availability of large-tonnage batches and in the low-temperature performance of vulcanizates. Butylene fractions are not direct substitutes in polymerization processes but can be routed into butadiene production through the dehydrogenation stage, which is relevant for vertically integrated sites.

For toughened plastics, acrylic modifiers offer an alternative to butadiene latex in ABS copolymers, providing better weather resistance but inferior low-temperature impact strength. The choice in favor of butadiene remains for applications requiring a balance of impact strength, elasticity and cost on a large-tonnage scale.

Supplier Selection Criteria and Specification Development

For B2B procurement of 1,3-butadiene, the specification must include the grade, mass fraction of the main substance, inhibitor type and concentration, limit values for moisture and impurities, packaging type and required temperature regime. The supplier confirms a valid safety data sheet, readiness to support hazardous cargo handling and availability of permits for packaging.

Additional evaluation covers batch-to-batch quality stability, availability of cylinders or tank containers, timelines for export and import documents and the ability to organize multimodal transport. Specific manufacturers are not disclosed; the portal consolidates offers from global markets and builds a transparent supply chain.

Typical Handling and Processing Errors

• Failure to monitor inhibitor content. During prolonged storage, the tert-butylcatechol concentration decreases, creating a risk of spontaneous polymerization in the container. Periodic laboratory monitoring of residual inhibitor is mandatory.
• Ignoring the temperature factor during loading. Heating the product above regulated values accelerates polymerization and increases system pressure. Loading and storage are conducted within a narrow temperature corridor.
• Use of incompatible sealing materials. Butadiene attacks many plastics and some types of rubber, so valves and gaskets must be resistant to diene hydrocarbons.
• Neglecting grounding and static electricity dissipation. Pumping liquefied gas and moving vapors generate electrostatic charges. All operations are conducted with equipment grounding and explosion-proof tools.
• Mixing stabilized and unstabilized batches. Unstabilized divinyl must not be stored or transported; mixing batches with different inhibitor contents leads to unpredictable product behavior.

Quality Control and Laboratory Methods

Incoming inspection of 1,3-butadiene at the consumer plant confirms batch conformity to GOST R 55066-2012 and the manufacturer certificate of quality. Key determined parameters include:

• Mass fraction of the main substance. Determined chromatographically; polymerization grades typically require a divinyl content of 99 percent or higher.
• Hydrocarbon impurity content. Butane, butenes, propylene and other C3-C4 fractions are monitored because they affect polymerization kinetics and polymer properties.
• Mass fraction of moisture. Moisture is a catalytic poison for organometallic catalysts and initiates equipment corrosion.
• Inhibitor content. Preservation of the protective concentration at the time of acceptance is confirmed.
• Peroxide compound content. Their absence or presence within acceptable limits indicates proper storage and transport conditions.
• Oxygen-containing impurities. For chemical synthesis and certain polymerization processes, aldehydes, ketones and alcohols are standardized.

Sampling from tank cars and tanks is performed in accordance with GOST 14921 with observance of safety measures; spot samples are combined into a representative laboratory sample, which is analyzed on the day of collection.

Storage and Transportation Conditions

1,3-Butadiene is a liquefied gas of UN class 2.1. Storage and transport are governed by hazardous goods regulations.

Storage. The product is stored only in stabilized form, in sealed packaging, in a cool, dry and well-ventilated area protected from direct sunlight and heat sources. The recommended storage temperature is not above 30 degrees Celsius. Tanks and cylinders are equipped with safety valves and pressure monitoring devices. Co-storage with oxidizers, acids and food products is not permitted.

Transportation. Large-tonnage batches are carried in rail tank cars and tank containers rated for the vapor pressure of the product at the maximum ambient temperature. Sea transport uses gas carriers maintaining a temperature of about minus 4 degrees Celsius or pressurized tankers. Road transport is permitted in special containers and cylinders complying with ADR requirements. Before loading, packaging is cleaned, purged with inert gas and leak-tested. Transport without an inhibitor is prohibited.

Finding Analogues and Interchangeability

When supply disruptions occur or feedstock base diversification is required, direct substitution of 1,3-butadiene with another monomer without changing the formulation and technology is generally impossible because divinyl determines the target property set of the polymer. The search proceeds in two directions.

The first is selecting a supplier of 1,3-butadiene of the same grade and with a comparable purity level from another region. Comparability criteria include the mass fraction of the main substance, inhibitor content and impurity profile by chromatography. The second is technological replacement with isoprene or a combination of monomers with reformulation, which requires pilot-scale trials and confirmation of the final product properties. The decision is based on laboratory testing, not solely on certificate data.

Supplier evaluation considers country of origin, availability of the required packaging type, a valid safety data sheet and readiness to support customs procedures. Specific manufacturers are not disclosed; the portal consolidates offers from global markets.

Supply Routes: Worldwide

Global supply routes for 1,3-butadiene are organized through petrochemical hubs with pyrolysis and dehydrogenation capacity. Large-tonnage batches move by rail tank cars and tank containers; intercontinental deliveries use gas carriers or pressurized tankers with subsequent transfer to rail or road transport. For plants without their own unloading racks, cylinder delivery through specialized terminals is organized.

The portal acts as the chain organizer: from batch search and specification agreement to freight, cargo insurance and interaction with the customs broker. Supply schemes are built on a worldwide basis without disclosure of specific manufacturers.

Logistics and Customs Clearance

1,3-Butadiene is classified as a hazardous good, which imposes elevated requirements on logistics planning. Sea transport is carried out in tank containers or on specialized gas carriers; pressurized tankers are possible for short legs and cabotage. Rail transport uses tank cars approved for liquefied petroleum gases under pressure, with mandatory compliance with the packaging technical inspection schedule.

Road delivery is used for the last mile and for small cylinder batches; it requires the carrier to hold a permit for the transport of class 2 hazardous goods and to operate appropriately marked vehicles. Multimodal schemes sea plus rail and sea plus road are used for intercontinental imports.

Customs clearance includes classification under the HS code, preparation of a safety data sheet in Russian, conformity declaration and payment of customs duties. For liquefied gases under pressure, conformity of packaging to TR TS 032/2013 is additionally confirmed. The portal provides customs broker services and supports all clearance stages.

Risk Factors and Industrial Safety Measures

Key risks relate to fire hazard, vapor toxicity and spontaneous polymerization. Production areas are equipped with supply and exhaust ventilation and gas analyzers; power supply and tools are explosion-proof. Personnel use personal protective equipment, including filtering respirators and hydrocarbon-resistant clothing. In case of a leak, the area is cordoned off, ignition sources are eliminated, the spill is localized with inert materials and vapors are suppressed with a water curtain.

Process regulations provide pressure and temperature interlocks, emergency relief to a flare or safe vessel, and periodic control of oxygen content in the gas phase. Compliance with these measures reduces the probability of uncontrolled polymerization and emergencies.

FAQ: Common Questions from Procurement and Process Specialists

Can butadiene be stored without an inhibitor

No. Unstabilized 1,3-butadiene tends to form peroxides and undergo spontaneous polymerization, which can rupture the container. Only product with confirmed inhibitor content is subject to storage and transport.

Which butadiene grade is suitable for ABS plastics

ABS production uses 1,3-butadiene that ensures the formation of polybutadiene latex with a specified particle size. As a rule, this is a product with a high mass fraction of the main substance and minimal oxygen-containing impurities. The specific grade is agreed with the supplier and confirmed by pilot production.

How often should the inhibitor content in a batch be checked

During incoming inspection, always. During prolonged storage at the consumer warehouse, periodically, at a frequency established by internal regulations but not less than necessary to confirm the protective concentration before processing begins.

Is butadiene transport in road tankers permitted

Road transport of liquefied butadiene is permitted in specialized tankers and containers rated for the appropriate pressure and equipped with protective devices. Steel cylinders are used for small volumes. The vehicle must hold a permit for the transport of class 2.1 hazardous goods.

What is the difference between grade A and grade B under GOST R 55066-2012

Grade A is intended for general-purpose synthetic rubbers, grade B for the synthesis of chloroprene and specialty elastomers. The differences concern standardized quality indicators and the impurity profile.

What documents are required for butadiene import

Import requires a contract, invoice, packing list, safety data sheet in Russian, manufacturer certificate of quality, transport documents and a declaration of conformity. The portal organizes the preparation of the full document set and interaction with the customs broker.

Conclusion

1,3-Butadiene remains an indispensable monomer for large-scale synthetic rubbers, ABS plastics and specialty elastomers. Its physical properties and chemical reactivity demand professional handling: mandatory inhibition, observance of temperature regimes and use of specialized packaging. For the B2B buyer, the value of working through the apptrade.ru portal lies in closing the entire supply loop from selecting a stabilized batch of the required grade to organizing hazardous logistics and customs clearance within a single window, without disclosure of specific manufacturers and with guaranteed compliance with regulatory requirements.

Contact Us

For procurement inquiries and supply chain organization, contact the portal team at info@apptrade.ru.