ABS (Acrylonitrile-Butadiene-Styrene) for FDM

Material Profile: ABS (Acrylonitrile-Butadiene-Styrene) for FDM

FDM Engineering Material Technical Report Series

Compiled from manufacturer technical datasheets and peer-reviewed literature

Abstract—ABS is the original engineering FDM thermoplastic — the same polymer family as injection-moulded LEGO bricks, automotive trim, and consumer electronics housings. It offers higher service temperature and impact resistance than PLA at the cost of more demanding print conditions (closed chamber, heated bed, ventilation for styrene off-gas). This profile covers the standard / generic ABS grade; for stiffness-enhanced (ABS-M30 / Enhanced), ESD, flame-retardant, or carbon-fibre variants, see the corresponding Material Profile volumes (06, 04, 05, 07).

Index Terms—additive manufacturing, FDM, ABS, general-purpose engineering thermoplastic, acetone smoothing.

I.  MATERIAL IDENTIFICATION

This section establishes the canonical names and commercial designations under which the material is supplied.

A.  Designation

Trade name: ABS (generic, trademark-free). Commercial grades include Stratasys ABS, Polymaker PolyLite™ ABS, Bambu Lab ABS, eSUN ABS+, MatterHackers Build Series ABS. Most consumer ABS filaments are based on Lustran®, Cycolac®, or similar SABIC / INEOS / LG Chem injection-grade resins.

B.  Full Chemical Name

Acrylonitrile-Butadiene-Styrene terpolymer — a two-phase polymer in which polybutadiene rubber particles are dispersed in a continuous styrene-acrylonitrile (SAN) matrix. The SAN backbone provides rigidity and chemical resistance; the polybutadiene rubber provides impact toughness.

C.  Aliases and Alternative Designations

II.  COMPOSITION AND MOLECULAR STRUCTURE

A.  Empirical Chemical Formula

Idealised composition: [(C₃H₃N)ₐ-(C₄H₆)ᵦ-(C₈H₈)ᵧ]ₙ where typical mass fractions are 20–30% acrylonitrile, 5–30% butadiene, and 40–60% styrene. The exact ratio determines the property balance.

Fig. 1.  Repeating unit / structural schematic of the polymer matrix.

Fig. 2.  Schematic of the single-phase polymer (no reinforcement).

B.  Composition Breakdown

TABLE I
 COMPOSITIONAL BREAKDOWN OF ABS (TYPICAL / PER SUPPLIER DATASHEET)

III.  MECHANICAL PROPERTIES — XZ PRINT DIRECTION

In the XZ orientation the tensile load is applied parallel to the deposited rasters; for fibre-reinforced grades this is the strongest orientation because the fibres align preferentially along the extrusion direction.

TABLE II
 MECHANICAL PROPERTIES — XZ ORIENTATION (ABS)

IV.  MECHANICAL PROPERTIES — ZX PRINT DIRECTION

In the ZX orientation the tensile load is applied perpendicular to the print layers, so failure occurs through inter-layer (Z) bonds. Properties are markedly lower than in XZ — this anisotropy is intrinsic to FDM.

TABLE III
 MECHANICAL PROPERTIES — ZX ORIENTATION (ABS)

Standard ABS has XZ:ZX UTS ratio ≈ 1.4:1 — moderate anisotropy. Layer-bonding quality is highly sensitive to chamber temperature: an open-frame print produces ~30% lower Z-direction strength than the same part printed in an actively heated enclosure. Inter-layer porosity is the dominant Z failure mode.

V.  RECOMMENDED PRINT PARAMETERS

Values summarised below give consensus operating windows from public datasheets. Specific suppliers may differ within ±10 °C; the supplier datasheet always supersedes this table.

TABLE IV
 RECOMMENDED PRINT TEMPERATURE RANGES FOR ABS

VI.  GLASS TRANSITION TEMPERATURE (TG)

Reported / typical Tg: ≈ 105–110 °C.

ABS is fully amorphous (no crystallinity, no melting point in the conventional sense). Tg is dominated by the SAN phase; service temperature is generally limited to ~80 °C continuous to maintain dimensional stability. Annealing is generally not performed on amorphous ABS; instead, post-print stress-relief at 70–80 °C × 2–4 h can be used to relieve residual print stresses, and acetone-vapour smoothing is widely used for cosmetic finishes.

VII.  HEAT DEFLECTION TEMPERATURE (HDT)

Heat deflection temperature is the temperature at which a standard bar deflects 0.25 mm under a specified flexural load (ASTM D648 / ISO 75).

TABLE V
 HEAT DEFLECTION TEMPERATURE OF ABS UNDER STANDARD TEST LOADS

VIII.  DISTINGUISHING CHARACTERISTICS AND STANDARDS

A.  Higher temperature and impact than PLA

ABS's continuous service to ~80 °C and 100+ J/m notched impact strength make it the standard for functional / mechanical parts that PLA cannot survive — automotive cabin parts, drone arms, snap-fits subject to repeated flex, and parts in contact with warm fluids.

B.  Acetone vapour smoothing — uniquely available for FDM

ABS dissolves in acetone (CH₃COCH₃), enabling vapour-phase chemical smoothing that yields injection-mould-quality surface finish. Place printed part in a sealed container with acetone-saturated cloth at 50–60 °C for 5–30 minutes; the surface layer briefly liquefies and reflows, eliminating layer lines. The technique is unique to ABS / ASA among common FDM polymers.

C.  Soluble support compatibility

ABS is compatible with Stratasys SR-30 / SR-35 soluble support material (chemical removal in alkaline solution), enabling complex internal geometries that would be unprintable with break-away supports. This is widely used in industrial Stratasys Fortus systems.

D.  Print difficulty and limitations

ABS's high CTE (~9 × 10⁻⁵ /K) and crystallisation-free shrinkage on cooling make it prone to warping, layer separation, and corner curl — particularly for large parts. Closed enclosures with active temperature control are essential. ABS is also UV-sensitive (yellowing / embrittlement on outdoor exposure); for UV-stable applications, use ASA (volume 08) instead.

IX.  REPRESENTATIVE APPLICATIONS

ABS is typically deployed in the following applications:

1)  Functional prototypes: End-use part validation prior to injection-mould tooling commitment.

2)  Consumer product housings and casings: Same polymer family as injection-moulded electronics enclosures, providing realistic prototypes.

3)  Automotive interior components: Cabin trim, fixtures, fittings — matching injection-moulded ABS in service environment.

4)  LEGO-compatible / interlocking models: Same chemistry as commercial bricks; suitable for compatible custom pieces.

(Source : All3dp)

5)  Acetone-smoothed cosmetic models: Display / show pieces requiring smooth surfaces without sanding labour.

(Source : Reddit)

X.  REFERENCES

[1]  Stratasys, “ABS Material Data Sheet,” 2023. Available: https://www.stratasys.com/en/materials/materials-catalog/fdm-materials/abs/

[2]  Polymaker, “PolyLite™ ABS Material Data Sheet,” 2024.

[3]  SABIC, “Cycolac® ABS Resin Selector Guide,” 2024.

[4]  B. Vasudevarao et al., “Sensitivity of Rapid-Prototyping Surface Finish to Process Parameters Variation,” Solid Freeform Fabrication Symposium, 2000.

[5]  ASTM D638-14; ASTM D256-10; ASTM D648-18.

[6]  UL 94, “Tests for Flammability of Plastic Materials,” Underwriters Laboratories, 2018 — note: standard ABS is HB rated only; for V-0 see Volume 05 (ABS FR0).