Onyx surface undergoing laser cleaning showing precise contamination removal
Yi-Chun Lin
Yi-Chun LinPh.D.Taiwan
Laser Materials Processing
Published
Jan 6, 2026

Onyx Laser Cleaning

Onyx stands out as a banded sedimentary stone that often features layered patterns of calcite and other minerals, which makes it a popular choice for decorative items like jewelry and architectural elements, although its porous nature can trap contaminants over time.

Laser-Material Interaction

How laser energy interacts with this material during cleaning

Absorptivity

0.2
0.1
0.2
0.3

Absorption Coefficient

100
m⁻¹
10
100
1,000

Laser Damage Threshold

8
J/cm²
5
8
15

Thermal Shock Resistance

1.5
MW/m
1
1.5
2

Reflectivity

0.1
0.05
0.1
0.2

Thermal Destruction Point

1,983
K
1,500
1,983
2,000

Vapor Pressure

0.001
Pa
0.001
0.001
0.1

Thermal Destruction

1,983
K
0
1,983
3,966

Specific Heat

740
J/(kg·K)
0
740
1,480

Laser Reflectivity

0.035
0
0.035
0.07

Thermal Conductivity

2.04
W/m·K
0
2.04
4.08

Thermal Expansion

1.2e-5
K^{-1}
0
1.2e-5
2.4e-5

Laser Absorption

0.32
0
0.32
0.64

Thermal Diffusivity

1e-6
m²/s
0
1e-6
2.1e-6

Ablation Threshold

4.2
J/cm²
0
4.2
8.4

Material Characteristics

Physical and mechanical properties defining this material

Fracture Toughness

0.78
MPa m^{1/2}
0
0.78
1.56

Youngs Modulus

78
GPa
0
78
156

Oxidation Resistance

1
dimensionless (resistance index)
0
1
2

Density

2.65
g/cm³
0
2.65
5.3

Hardness

7
Mohs
0
7
14

Corrosion Resistance

0.96
0
0.96
1.92

Compressive Strength

85
MPa
0
85
170

Flexural Strength

12.5
MPa
0
12.5
25

Tensile Strength

12.5
MPa
0
12.5
25

Porosity

0.4
%
0
0.4
0.8

Laser Damage Threshold

0.75
J/cm²
0
0.75
1.5

Onyx 500-1000x surface magnification

Microscopic surface analysis and contamination details

Before Treatment

You see the onyx surface covered in a thick layer of grime and dust particles. Tiny specks cling tightly to every crevice and rough spot. The whole thing looks dull and uneven under this close view.

After Treatment

The laser treatment wipes away all that buildup completely. Now the surface shines smooth and reveals fine natural bands. It appears fresh and uniform across the entire area.

Regulatory Standards

Safety and compliance standards applicable to laser cleaning of this material

FAQ

Common Questions and Answers
Is Onyx safe to laser clean, or does it produce hazardous fumes?
Laser cleaning of Onyx, a carbon fiber-reinforced nylon composite, demands precise fluence management around 5.1 J/cm². Notably, the process can release hazardous hydrogen cyanide gas from the polymer matrix. Thus, effective fume extraction and certified respiratory protection remain essential for ensuring operator safety.
What are the optimal laser parameters (wavelength, power, pulse duration) for cleaning soot or oxidation from Onyx without damaging the surface?
Specifically for Onyx, employ a 1064nm wavelength at 100W average power with 10ns pulses. Keep fluence below 5.1 J/cm² to ablate soot while preserving the stone's integrity. Notably, a 50μm spot size scanned at 500mm/s removes contaminants effectively without thermal damage.
Can laser cleaning remove support material from 3D printed Onyx parts effectively?
Yes, laser cleaning effectively removes support material from Onyx parts, particularly at the polymer interface. Specifically, a 1064 nm wavelength at 5.1 J/cm² ablates it without etching the stone substrate, thus offering a significant advantage over abrasive methods that risk surface scarring.
How do you clean a laser-sintered Onyx (SLS) part versus a FFF-printed Onyx part with laser?
Particularly for SLS Onyx, apply 5.1 J/cm² to clear trapped powder from its porous surface. In FFF parts, a lower fluence at 500 mm/s effectively removes layer lines without melting the polymer matrix. Thus, tailoring energy to their unique surface topographies proves essential.
Does laser cleaning affect the dimensional accuracy or mechanical strength of an Onyx part?
Properly controlled laser cleaning particularly preserves Onyx's structural integrity. Notably, with a 5.1 J/cm² fluence and 50 µm spot size, we ablate contaminants effectively without inducing thermal stress or dimensional changes that could compromise mechanical strength.
What is the best way to clean carbon fiber-filled materials like Onyx compared to unfilled nylons?
For Onyx, the carbon fibers particularly absorb laser energy readily, thus requiring conservative settings like 5.1 J/cm² fluence to avoid charring. This proves more critical than for pure nylon, where higher energies can typically be tolerated without such thermal damage.
After laser cleaning Onyx, is the surface left with a different texture or color?
When laser cleaning is tuned precisely to ~5.1 J/cm² fluence, it particularly preserves Onyx's original polish. Yet, excessive energy may create a localized matte texture through micro-ablation. This cosmetic alteration notably influences later finishing processes, thus necessitating a light repolish for high-gloss results.
Are there any specific certifications or regulatory guidelines for laser cleaning composite materials like Onyx in an industrial setting?
For Onyx laser cleaning, consult the MSDS particularly for silica content while adhering to OSHA 29 CFR 1910.134 on respiratory protection. Notably, the 1064 nm wavelength at 5.1 J/cm² reduces subsurface damage; however, air monitoring proves essential against crystalline silica fume exposure, thus demanding specific PELs.

Common Contaminants

Types of contamination typically found on this material that require laser cleaning
ContextIndustrial oil contamination, it manifests as tenacious organic residues in manufacturing environments, forming irregular films that cling to metal surfaces, influenced from prolonged exposure to l...

Onyx Dataset

Download Onyx properties, specifications, and parameters in machine-readable formats
39
Variables
0
Laser Parameters
0
Material Methods
11
Properties
3
Standards
3
Formats
View all Stone datasets

License: Creative Commons BY 4.0 • Free to use with attribution •Learn more

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