Acrylonitrile butadiene styrene is a terpolymer, and each of its three components does a job: acrylonitrile brings chemical and heat resistance, butadiene brings impact toughness, styrene brings rigidity, gloss and processability. Shifting the ratio shifts the grade, which is why ABS grades are described by the balance they strike rather than by a single number. This is a plain-English reference for buying and selling ABS, prime or recycled.
What are the main ABS grade types?
- High-impact — more butadiene rubber, for parts that must survive knocks. Lower stiffness and gloss.
- Medium-impact and general-purpose — the balanced workhorse for housings and enclosures.
- High-flow — for large or thin-walled mouldings that need to fill easily; typically lower impact.
- Heat-resistant — raised heat distortion temperature for automotive interior and appliance parts that see warmth.
- Plating grade — formulated so the surface can be chemically etched and electroplated, common in automotive trim and sanitary ware.
- Flame-retardant (FR) — meeting a stated flammability rating, historically often via brominated compounds.
- ABS/PC blends — alloyed with polycarbonate for higher impact and heat performance; a distinct material, not ABS.
Melt flow for ABS is commonly quoted at 220°C under 10 kg, though other conditions appear. As with every polymer, the number without the condition is not a specification.
What should I check on recycled ABS?
Recycled ABS mostly originates from two very different places, and the distinction drives everything:
- Post-industrial — sprues, runners, purgings and rejected mouldings from a known factory. Usually a single grade and colour, clean, and the easiest recycled ABS to buy with confidence.
- Post-consumer WEEE — housings from electrical and electronic equipment. Mixed grades, mixed colours, and the stream where the regulatory question bites.
That question is brominated flame retardants. Older electronic housings can contain BFRs that are now restricted as persistent organic pollutants, and material above the regulatory threshold cannot lawfully be recycled into new product in the UK and EU — it must be routed to appropriate destruction. Reputable suppliers screen for it, typically by X-ray fluorescence for total bromine, with laboratory confirmation where the screen is borderline.
If you are buying recycled ABS of electronic origin, ask what screening was done and ask to see it. This is a legal compliance point rather than a quality preference, and it does not show up in a photograph.
What drives the price of ABS?
- The styrene, butadiene and acrylonitrile feedstock markets, which move the virgin price that recycled tracks.
- Grade type — plating, heat-resistant and FR grades price above general purpose, and ABS/PC blends above plain ABS.
- Colour — natural and light colours above black and mixed, because they can be recoloured downstream.
- Source and consistency — single-source post-industrial regrind above mixed post-consumer material, by a wide margin.
- BFR screening and compliance documentation on WEEE-derived material.
- Condition and form — pellet above regrind above unground parts.
- Quantity, location and incoterm.
These move independently and the compliance dimension can override the technical one entirely. ABS is best priced against live offers of the same grade type, colour and provenance.
How does Prime Polymers handle ABS?
ABS listings state grade, condition, colour, quantity, location, incoterm and the seller's own asking price per tonne, and sellers can attach documents and photographs so provenance and screening evidence travel with the offer. Prices are shown exactly as sellers enter them — never computed, adjusted or benchmarked by us. Browsing is free and open without an account. If nothing on the board fits, a Wanted post puts your specification in front of sellers. Prime Polymers is operated by ARC Polymers Ltd, a UK polymer trading company.
Frequently asked questions
- What does ABS stand for and why does it matter?
- Acrylonitrile butadiene styrene. Each component contributes something: acrylonitrile gives chemical and heat resistance, butadiene gives impact toughness, styrene gives rigidity and gloss. Changing the ratio changes the grade, which is why ABS grades are described by their impact and flow balance.
- Why do recycled ABS buyers ask about bromine?
- Because older electronic housings can contain brominated flame retardants now restricted as persistent organic pollutants. Material above the regulatory threshold cannot be recycled into new products and must be routed for destruction. Screening is usually by X-ray fluorescence for total bromine, with lab confirmation where needed.
- Is ABS/PC the same as ABS?
- No. ABS/PC is an alloy of ABS with polycarbonate, giving higher impact strength and heat resistance. It is a different material with a different price and different processing, and it should be declared as a blend rather than sold as ABS.
- What is plating-grade ABS?
- A grade formulated so the moulded surface can be chemically etched and then electroplated with metal, used for automotive trim, sanitary fittings and decorative parts. The butadiene phase is tailored to etch predictably, and the grade prices above general purpose.
- How can I see what ABS is trading at?
- Compare live offers of the same grade type, colour and provenance. On Prime Polymers each ABS listing shows the seller's asking price per tonne next to grade, condition, quantity, location and incoterm. If nothing matches, post a Wanted requirement and let sellers come to you.