ABS Resin
Three monomers, each doing one job: styrene for rigidity and gloss, acrylonitrile for chemical resistance, butadiene for the toughness the other two lack. It is also the only common plastic you can electroplate.
Molecular Structure
What is ABS Resin?
ABS is not a single polymer but a two-phase material. A continuous matrix of styrene-acrylonitrile copolymer provides rigidity, gloss and chemical resistance; dispersed through it are particles of polybutadiene rubber, grafted to the matrix so that the two phases are chemically anchored to one another. The rubber particles arrest propagating cracks in the same way they do in high impact polystyrene, but with the added chemical resistance the nitrile brings.
Composition varies widely — typically 15 to 35% acrylonitrile, 5 to 30% butadiene and the balance styrene — and grade selection is largely a matter of where a producer has set that balance. More butadiene gives impact at the cost of stiffness and heat; more acrylonitrile gives chemical resistance and heat at the cost of colour and flow.
Production is by emulsion grafting, where a rubber latex is grafted with styrene and acrylonitrile and then blended with separately made SAN, or by continuous mass polymerisation, which gives lower residual monomer and better colour but a narrower range of achievable rubber content.
ABS is the standard substrate for decorative electroplating on plastic, and the reason is structural. Chromic acid etching selectively dissolves the butadiene rubber particles at the surface, leaving microscopic cavities that the deposited metal keys into mechanically. No rubber phase, no adhesion — which is why plating grades specify a rubber content and morphology rather than just a mechanical property.
Quick Reference
Key Physical & Chemical Properties
Structure & Bonding
Three monomer units along one chain: a nitrile from acrylonitrile, a phenyl ring from styrene, and an in-chain double bond from butadiene. In the finished material the butadiene-rich chains form a separate rubber phase dispersed through the styrene-acrylonitrile matrix.
Terpolymer units — acrylonitrile, styrene and butadiene-derived
Structural Identity
- PolymerAcrylonitrile butadiene styrene
- StructureTwo-phase: SAN matrix + grafted rubber
- Acrylonitrile contributesChemical resistance, heat, rigidity
- Butadiene contributesImpact strength, plating adhesion
- Styrene contributesRigidity, gloss, processability
- Typical composition15 – 35% AN, 5 – 30% BD
- Made byEmulsion grafting or continuous mass
- MorphologyAmorphous
- Key vulnerabilityButadiene double bonds oxidise in UV
- CAS Number9003-56-9
- Specified byMFR, impact, HDT, gloss, grade type
Product Specifications
Chelora supplies ABS Resin in standard and custom grades. Contact us for specification sheets tailored to your process.
| Polymer | Acrylonitrile butadiene styrene |
|---|---|
| CAS Number | 9003-56-9 |
| Composition | (C₈H₈·C₄H₆·C₃H₃N)ₙ — ratio varies by grade |
| Density | 1.04 – 1.07 g/cm³ (ISO 1183) |
| Melt flow rate | 1 – 40 g/10 min at 220 °C / 10 kg (ISO 1133) |
| Vicat softening point | 95 – 110 °C at 50 N |
| Heat deflection temperature | 85 – 100 °C at 1.8 MPa |
| Tensile strength at yield | 38 – 50 MPa |
| Notched Izod at 23 °C | 100 – 400 J/m |
| Flexural modulus | 1900 – 2600 MPa |
| Gloss at 60° | Grade dependent — high gloss to matt |
| Residual acrylonitrile (max) | ≤ 30 ppm wt |
| Residual styrene (max) | ≤ 500 ppm wt |
| Residual butadiene (max) | ≤ 5 ppm wt |
| Water content before processing (max) | ≤ 0.10 wt% |
| Drying condition | 2 – 4 h at 80 – 85 °C |
| Flammability | UL 94 HB standard; V-0 grades available |
| Grade types | Injection, extrusion, high heat, FR, plating, transparent |
| Transport classification | Not regulated as dangerous goods |
Downstream Applications & Derivatives
Key derivative chains and industrial uses of ABS Resin.
Automotive Interior
Instrument panels, consoles, trim, grilles and mirror housings, often as PC/ABS blend where heat resistance and dimensional stability need lifting.
Appliance Housings
Refrigerator components, vacuum cleaner and small appliance bodies, and power tool housings, where impact, gloss and mouldability are all needed at a moderate price.
Electronics Enclosures
Computer, telecoms and audio-visual housings, usually in flame-retardant grades meeting UL 94 V-0 for enclosure requirements.
Electroplated Parts
Decorative chrome-plated grilles, badges, handles, bathroom fittings and cosmetic caps. ABS is the standard plating substrate across the whole industry.
Toys & Consumer
Construction toys, luggage shells, sports goods and housewares, where dimensional precision, surface finish and impact all matter together.
Sheet, Pipe & 3D Printing
Thermoformed sheet for automotive and sanitary ware, drain waste and vent pipe, and one of the two dominant filament materials in fused deposition printing.
Why source ABS Resin through Chelora Petrochem?
Verified Origin
Full origin certification and asset-backed supply chain documentation — no grey-market or off-spec prime passed as prime.
Grade Flexibility
Injection, extrusion, high heat, flame-retardant, plating and transparent grades supplied, plus PC/ABS blends. We match on impact, heat and gloss together, since ABS grades vary in composition rather than only in molecular weight.
Full Documentation
Technical data sheet, CoA including residual monomers, SDS, REACH compliance, UL listings where applicable, and toy safety or food-contact documentation for grades that support it.
Logistics Support
Experienced in polymer resin logistics — 25 kg bags and jumbo bags with moisture-barrier packaging, containerised and bulk delivery, with pellet-loss controls, for Indian and international delivery.
Storage & Handling Guidelines
Always refer to the full SDS before handling. The following is a summary of key requirements.
- Dry before processing — typically two to four hours at 80 to 85 °C to below 0.10% moisture. ABS is hygroscopic through its nitrile groups, and undried resin gives splay, silver streaking and reduced weld line strength.
- Keep drying temperature below 85 °C. ABS softens near its glass transition, and pellets bridge and agglomerate in the hopper if the dryer runs too hot.
- Do not use ABS outdoors without protection. The butadiene phase carries carbon-carbon double bonds that oxidise under UV, and the surface chalks, yellows and embrittles within a season. ASA, a capped construction or a coating is the answer, not a UV additive alone.
- Store pellets out of sunlight for the same reason, and rotate stock.
- Control melt temperature. Above roughly 260 °C the rubber phase degrades and impact strength falls, and residual monomer generation rises with it.
- Segregate plating grades. Plating adhesion depends on rubber particle content and morphology at the surface, and a non-plating grade run through the same line will fail etch and adhesion tests without any visible difference in the moulding.
- Keep ketones, esters and chlorinated solvents away from the resin and finished parts. ABS is attacked by all of them, and stress cracking follows under load.
- Contain pellets rigorously, ground and bond conveying, and control fines — which cause surface defects on gloss parts well before they present a dust hazard.
- Treat molten polymer as a serious thermal burn hazard at 220–260 °C, and extract at the die, where styrene and acrylonitrile vapour are the fume of concern.
Hazard Summary
Classification: ABS resin in pellet form is not classified as hazardous under CLP. The polymer is inert. The hazards are process-related, plus the residual monomer question inherited from its feedstocks.
Residual monomers: ABS is made from acrylonitrile, butadiene and styrene, all three of which carry health classifications in their monomeric form — acrylonitrile as Carc. 1B and acutely toxic, butadiene as Carc. 1A, styrene as a probable human carcinogen. Commercial resin is stripped to low parts per million and presents no practical exposure risk, but the figures belong on the certificate, and they matter for food-contact, toy and medical applications. Mass-polymerised ABS generally achieves lower residuals than emulsion grades.
Processing fume: ABS degrading above roughly 260 °C releases styrene and acrylonitrile vapour along with other degradation products. Local extraction at the die and hopper is the control, and a sharp odour is a reliable sign the melt is too hot or held too long.
UV degradation is severe: the butadiene phase oxidises readily under sunlight, and unprotected ABS chalks, yellows and loses impact strength within a single season outdoors. This is a material limitation rather than a stabilisation problem — outdoor applications should use ASA, a capped construction or a coating.
Chemical attack: ketones, esters, chlorinated solvents and many aromatic hydrocarbons dissolve or craze ABS, and stress cracking follows under load. Cleaning agents and adhesives should be tested on stressed parts.
Flammability: standard ABS is UL 94 HB and burns readily with dense smoke. Enclosure and electrical applications generally require a flame-retardant grade, and substituting a standard grade into an FR-rated design is a serious compliance failure.
Thermal burns: molten ABS at 220–260 °C adheres to skin and retains heat. Purging and die work need forearm and face protection.
PPE minimum: safety glasses and gloves for pellet handling; heat-resistant gloves, arm protection and face shield for work on molten material.
Consult the full SDS and the grade technical data sheet for drying and processing conditions, and confirm flammability rating and residual monomer figures for regulated applications.
Frequently Asked Questions
Technical and commercial questions about ABS Resin sourcing and specifications.
What is ABS used for?
Automotive interior parts — instrument panels, consoles, trim, grilles — often as PC/ABS blends. Appliance and power tool housings. Electronics and telecoms enclosures in flame-retardant grades. Electroplated decorative parts including grilles, badges, handles and bathroom fittings. Toys and luggage, where dimensional precision and surface finish matter. And sheet for thermoforming, drain waste and vent pipe, and 3D printing filament.
What does each of the three monomers contribute?
Styrene provides rigidity, gloss and easy processing — it is what makes ABS mouldable with a good surface. Acrylonitrile provides chemical resistance, heat resistance and additional rigidity through its polar nitrile groups. Butadiene provides impact strength: it forms a separate rubber phase whose particles arrest propagating cracks. Adjusting the ratio moves the property balance directly — more butadiene buys toughness at the cost of stiffness, heat resistance and gloss; more acrylonitrile buys chemical and heat resistance at the cost of colour and flow. That is why ABS grades differ in composition rather than only in molecular weight, and why a single melt flow figure describes a grade poorly.
Why is ABS the standard plastic for electroplating?
Because of the rubber phase. Metal will not bond chemically to a plastic surface, so plating on plastic relies on mechanical keying. The part is etched in chromic acid, which selectively attacks and dissolves the polybutadiene particles exposed at the surface while leaving the SAN matrix intact. That leaves a surface covered in microscopic cavities, and the electroless nickel or copper layer deposited next flows into them and locks in place. No other commodity plastic offers a selectively etchable dispersed phase in the same way. It also means plating grades are specified on rubber content and particle morphology — a mechanically identical non-plating grade will fail adhesion testing.
Why does ABS fail outdoors?
The butadiene phase is the weak point. Polybutadiene retains carbon-carbon double bonds along its chain, and those double bonds are readily attacked by ultraviolet light and atmospheric oxygen. The rubber particles oxidise and crosslink, the surface chalks and yellows, and — more seriously — the impact strength that the rubber was there to provide disappears. This happens within a single season of direct exposure. Adding UV stabiliser slows it but does not solve it. The proper answers are ASA, where an acrylic rubber with no backbone unsaturation replaces the butadiene, a capped construction with a weatherable skin, or a coating.
What is PC/ABS and when should I use it?
It is a blend, typically 50 to 70% polycarbonate with ABS, and it exists because each polymer covers the other's weakness. Polycarbonate brings heat resistance, stiffness and outstanding impact but flows poorly, costs more and is notch sensitive. ABS brings flow, easier moulding of complex thin-walled parts, lower cost and better notch behaviour. The blend gives a heat deflection temperature well above ABS with far better processability than polycarbonate. It is the default for automotive interior structural trim and for laptop and electronics housings — anywhere a part is thin, complex, needs to survive impact and sees temperatures ABS alone would not tolerate.
What documentation does Chelora provide?
Every shipment includes the grade technical data sheet, a Certificate of Analysis against the grade specification covering melt flow rate, density, notched impact, heat deflection temperature and residual acrylonitrile, styrene and butadiene; a Safety Data Sheet to GHS and REACH format; REACH polymer compliance confirmation; UL listings and flammability classification where applicable; toy safety or food-contact documentation for grades that support it; an origin certificate; and destination-market certificates where required.
Request a quote or specification sheet
Talk to Chelora's sourcing team about ABS Resin grade, volume, logistics, documentation, and lead times. We respond within one business day.
