ABS FR0 — Flame-Retardant ABS (UL 94 V-0) for FDM

Material Profile: ABS FR0 — Flame-Retardant ABS (UL 94 V-0) for FDM

FDM Engineering Material Technical Report Series — Volume 5 of 16

Compiled from manufacturer technical datasheets and peer-reviewed literature

Abstract—ABS FR0 is a family of flame-retardant ABS filaments certified to the UL 94 V-0 vertical-burn standard. Halogen-free intumescent additives form a charred barrier on combustion, allowing the material to self-extinguish within 10 seconds of flame removal with no flaming drips. Mechanical properties are comparable to standard ABS, making FR0 a drop-in replacement where electrical safety, IEC 60695, or FAR 25.853 compliance is required. Data drawn from SUNLU, Inslogic, 3DXTech FireWire FR-ABS, and 3DTrcek datasheets.

Index Terms—additive manufacturing, FDM, flame retardant, UL 94 V-0, ABS, IEC 60695, electrical safety.

I.  MATERIAL IDENTIFICATION

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

A.  Designation

Trade name: ABS-FR (Flame-Retardant ABS), often suffixed FR0 or V-0 indicating UL 94 rating. Examples: SUNLU ABS-FR, Inslogic ABS FR V0, 3DXTech FireWire FR-ABS.

B.  Full Chemical Name

Acrylonitrile-Butadiene-Styrene terpolymer modified with halogen-free flame retardants — typically phosphorus- or nitrogen-based intumescent systems (e.g., melamine polyphosphate, ammonium polyphosphate).

C.  Aliases and Alternative Designations

II.  COMPOSITION AND MOLECULAR STRUCTURE

A.  Empirical Chemical Formula

Matrix: ABS terpolymer. FR additive: typically 10–25 wt% phosphorus / nitrogen-based intumescent (halogen-free).

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

Fig. 2.  Schematic of dispersed reinforcement / filler in the polymer matrix (not to scale).

B.  Composition Breakdown

TABLE I
 COMPOSITIONAL BREAKDOWN OF ABS FR0 (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 FR0)

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 FR0)

Anisotropy ratio similar to standard ABS (XZ:ZX UTS ≈ 1.6–1.8:1). FR additives slightly degrade impact properties versus unmodified ABS but preserve modulus.

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 FR0

VI.  GLASS TRANSITION TEMPERATURE (TG)

Reported / typical Tg: ≈ 100 – 105 °C (ABS matrix; FR additives have minimal effect on Tg).

Continuous service is generally limited to 80 °C or below to maintain dimensional stability. Stabilised FR grades show no measurable property loss after 1000 h at 80 °C.

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 FR0 UNDER STANDARD TEST LOADS

VIII.  DISTINGUISHING CHARACTERISTICS AND STANDARDS

A.  UL 94 V-0 certification — what it means

UL 94 V-0 is the most stringent vertical-burn classification under Underwriters Laboratories test UL 94. Test specimens (typically 125 × 13 × 1.6 mm bars) are subjected to two 10-second flame applications. To pass V-0: each specimen must self-extinguish within 10 seconds, total combustion time across all 5 bars must not exceed 50 seconds, no flaming drips may ignite cotton placed below, and combustion must not propagate to the holding clamp. ABS FR0 grades meet all four criteria.

B.  Test standards beyond UL 94

Equivalent / overlapping standards include IEC 60695-11-10 (vertical and horizontal flame test), FAR 25.853 / Appendix F (aircraft cabin materials, 12-second vertical burn, 6 in/min max burn rate), and UN ECE R.118 (bus interior fire behaviour). Phosphorus / nitrogen FR systems generate less smoke and toxic gas than legacy halogenated systems, supporting EN 45545-2 (railway material fire safety) compliance.

C.  Mechanical performance

Properties are comparable to standard ABS within 10–15%. Notched Izod impact strength of 13–14 kJ/m² is sufficient for enclosures and structural housings; 108% elongation at break (Inslogic data) demonstrates retained ductility versus brittle FR systems.

D.  Print considerations

FR additives slightly increase melt viscosity; nozzle temperature is held in the 240–260 °C range. Off-gassing during printing requires closed-chamber operation with active ventilation or filtered exhaust.

IX.  REPRESENTATIVE APPLICATIONS

ABS FR0 is typically deployed in the following applications:

1)  Electronic enclosures and PCB housings: Where IEC 60695 / UL 94 V-0 is required for safety certification.

(Source : Inslogic3d)

2)  Automotive interior components: Glove-box mechanisms, ventilation ducts, dashboard inserts.

(Source : 3dxtech)

3)  Aerospace interior parts (FAR 25.853): Cabin components needing flame retardancy without high-temperature performance.

4)  Rail and bus components (EN 45545-2): Passenger compartment interior fittings.

5)  Industrial equipment housings: Switchgear cabinets, control panel covers, thermal-protection covers.

Photographs of representative parts in these applications are not reproduced here for copyright reasons; the table below provides direct manufacturer / case-study URLs where original imagery and project descriptions can be viewed.

TABLE VI
 SUGGESTED IMAGE / CASE-STUDY SOURCES

X.  REFERENCES

[1]  UL Standard 94, “Tests for Flammability of Plastic Materials for Parts in Devices and Appliances,” 6th ed., Underwriters Laboratories, 2018.

[2]  IEC 60695-11-10, “Fire hazard testing — Test flames — 50 W horizontal and vertical flame test methods,” IEC, 2013.

[3]  FAA, FAR 25.853 / Appendix F, Compartment Interior Materials, 14 CFR 25.

[4]  EN 45545-2, “Railway applications — Fire protection on railway vehicles — Part 2,” CEN, 2020.

[5]  SUNLU, “ABS-FR Filament UL 94 V-0 Datasheet,” 2024. https://store.sunlu.com/products/sunlu-abs-flame-retardant-abs-fr-3d-printer-filament-1kg-engineering-filaments

[6]  Inslogic 3D, “ABS FR V0 Functional 3D Filament Datasheet,” 2024. https://store.inslogic3d.com/products/abs-fr-v0-filament

[7]  3DXTech, “FireWire FR-ABS Datasheet,” 2024. https://www.3dxtech.com/product/firewire-flame-retardant-abs/

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