Material Profile: ONYX Impact Plus Resin for SLA / LCD 3D
Phrozen SLA / LCD Resin Technical Report Series
Compiled from Phrozen official datasheets, SDS documents, and third-party technical reviews
Abstract—Phrozen ONYX Impact Plus (Black) is engineered for maximum impact resistance — Izod 50–90 J/m, the highest in Phrozen's engineering line, with elongation up to 25%. Trade-off vs ONYX Pro410 is reduced rigidity (modulus 1.5–2.0 GPa). The choice for engineering prototypes that must survive drops, impacts, and shock loading.
Index Terms—additive manufacturing, SLA, LCD, engineering resin, ONYX, high impact, drop resistance.
I. MATERIAL IDENTIFICATION
This section establishes the canonical names and commercial designations under which the resin is supplied.
A. Designation
Trade name: Phrozen ONYX Impact Plus Resin. Color: Black.
B. Resin Family
Highly toughened engineering acrylate / urethane-acrylate photopolymer with rubber-modifier; 405 nm UV cure.
C. Aliases and Alternative Designations
|
Alias |
Origin / Usage |
|
ONYX Impact Plus |
Standard product designation |
|
Impact Plus Black |
Color variant |
|
ONYX engineering tough |
Generic descriptor |
II. COMPOSITION AND PHOTOPOLYMER CHEMISTRY
A. General Resin Family
Generic photo-polymerisation: monomers (multi-functional acrylates / urethane-acrylates) + photoinitiator (e.g., TPO / BAPO) + 405 nm UV → crosslinked thermoset network. Exact formulation is proprietary. Rubber-toughened with high-elongation oligomers.
Fig. 1. Photopolymer crosslinking schematic for the resin family.
Fig. 2. SLA / LCD print → wash → post-cure process flow.
B. Composition Breakdown
TABLE I COMPOSITIONAL BREAKDOWN OF ONYX IMPACT PLUS RESIN (TYPICAL / PER SUPPLIER DATASHEET)
|
Constituent |
Mass fraction |
Function |
|
Rubber-toughened urethane-acrylate oligomers + flexible-chain acrylate monomers |
≈ 70–85 wt% |
Form the backbone of the cured network |
|
Reactive diluents (low-viscosity acrylates) |
≈ 10–20 wt% |
Reduce viscosity; increase crosslink density |
|
Photoinitiator (acylphosphine oxide, e.g., TPO) |
≈ 1–3 wt% |
Absorbs 405 nm UV, initiates radical polymerisation |
|
Pigments, stabilisers, additives |
≈ 1–3 wt% |
Color, UV blocker for shelf life, surface flow |
|
Total |
100 wt% |
— |
III. MECHANICAL PROPERTIES
ONYX Impact Plus prioritises impact resistance and elongation over peak modulus. Suitable when drop / impact survival matters more than absolute stiffness.
TABLE II MECHANICAL PROPERTIES OF ONYX IMPACT PLUS RESIN (POST-CURE, ISO 527 / ASTM D638)
|
Property |
Value |
Test method / source |
|
Density |
≈ 1.10–1.18 g/cm³ |
ASTM D792 |
|
Viscosity (uncured liquid) |
≈ 350–500 cP @ 25 °C |
Brookfield viscometer |
|
Surface hardness |
≈ Shore D 75–82 |
ASTM D2240 |
|
Tensile strength, ultimate (UTS) |
≈ 40–55 MPa |
ASTM D638 / ISO 527 |
|
Tensile (Young's) modulus |
≈ 1500–2000 MPa |
ASTM D638 |
|
Elongation at break |
≈ 15–25 % |
ASTM D638 |
|
Flexural strength |
≈ 60–75 MPa |
ASTM D790 |
|
Izod impact, notched (23 °C) |
≈ 50–90 J/m |
ASTM D256 |
IV. RECOMMENDED PRINT PARAMETERS
Values below are the manufacturer-recommended starting points for compatible Phrozen LCD printers; specific machines may require ±10–20% adjustment based on LCD age and ambient temperature.
TABLE III RECOMMENDED PRINT AND POST-PROCESS PARAMETERS FOR ONYX IMPACT PLUS RESIN
|
Parameter |
Value / range |
Notes |
|
UV wavelength |
405 nm |
Standard for Phrozen LCD printers |
|
Compatible printers |
Sonic Mini 8K / 8K S, Sonic Mighty 8K / 12K, Sonic Mega 8K |
Best paired with the indicated resolution class |
|
Layer thickness |
0.025–0.050 mm (typical 0.030 mm) |
Thinner layers improve detail at the cost of print time |
|
Normal exposure (per layer) |
≈ 2.0–3.0 s @ 8K resolution |
Test-tower validation recommended |
|
Bottom exposure |
≈ 25–35 s × 6 layers |
First-layer adhesion to build plate |
|
Lift distance / speed |
≈ 6–8 mm @ 60–100 mm/min |
Slower for fine geometries |
|
Wash medium |
Isopropyl alcohol (IPA) or 95% ethanol |
30–60 s wash; do not over-soak |
|
Post-cure |
405 nm UV box, 30–120 min depending on size |
Phrozen Cure Mega S or equivalent |
V. GLASS TRANSITION TEMPERATURE (TG)
Reported / typical Tg: ≈ 60–75 °C.
Lower Tg than ONYX Pro410 reflects the toughened formulation. Service to ~60 °C continuous.
VI. HEAT DEFLECTION TEMPERATURE (HDT)
HDT defines the temperature at which a 1.27 mm-thick standardised bar deflects 0.25 mm under the specified flexural load. Two test loads are reported per ASTM D648 / ISO 75.
TABLE IV HEAT DEFLECTION TEMPERATURE OF ONYX IMPACT PLUS RESIN
|
Test load |
HDT |
Test method / source |
|
0.45 MPa |
≈ 60–75 °C |
ASTM D648 |
|
1.82 MPa |
≈ 50–65 °C (estimate) |
ASTM D648 |
VII. DISTINGUISHING CHARACTERISTICS AND STANDARDS
A. Highest impact resistance in Phrozen's engineering line
Izod 50–90 J/m — 2–3× higher than ONYX Pro410 and standard engineering resins. Drop testing typically passes 1.0–1.5 m onto hard surfaces without cracking.
B. High elongation (15–25%)
Substantial flex before fracture; suitable for parts that must absorb deformation without catastrophic failure.
C. Trade-off: reduced modulus
Modulus 1.5–2.0 GPa is lower than rigid Engineering Pro410 / PC/GF-like. Use Impact Plus where impact survival > stiffness; use Pro410 where the reverse is true.
D. Drop / shock-loaded prototypes
Specifically the right choice for protective housings, drop-tested consumer products, and shock-mount fixtures.
VIII. REPRESENTATIVE APPLICATIONS
ONYX Impact Plus Resin is typically deployed in the following applications:
1) Drop-tested consumer product prototypes: Phone cases, wearable device housings, portable electronics enclosures.
2) Sports protective equipment prototypes: Helmet shells, padding hardware, equipment housings.
3) Industrial impact-mounting hardware: Shock-isolated brackets, drop-zone fixtures, transport-grade containers.
(Sourse : Phrozen)
4) Robot end-effector covers: Soft-touch impact-absorbing covers for collaborative robots.
5) Action figures (durable variants): Toys subject to play-impact loading.
IX. REFERENCES
[1] Phrozen Technology, “ONYX Impact Plus Product Page,” 2024. Available: https://global.phrozen3d.com/products/onyx-impact-plus
[2] Phrozen Technology, “ONYX Impact Plus SDS,” 2024. Available: https://cdn.shopify.com/s/files/1/0436/6965/1618/files/SDS_ONYX__Impact_Plus.PDF
[3] ASTM D638-14, “Standard Test Method for Tensile Properties of Plastics,” ASTM International.
[4] ASTM D2240-15, “Standard Test Method for Rubber Property — Durometer Hardness,” ASTM International.
[5] ASTM D648-18, “Standard Test Method for Deflection Temperature of Plastics Under Flexural Load,” ASTM International.
(Image Source : Phrozen)