For uses that need high optical transmittance and optical uniformity. It can be processed further into optical windows and similar optical materials.
SINGLE CRYSTAL DIAMOND BLANK (ROUGH/AS-CUT MATERIAL)
single-crystal diamond rough
Single Crystal Diamond Blank (Rough/As-cut Material)
Feedstock blocks from MPCVD-grown single-crystal diamond after initial cut separation—the starting material for further processing into substrates, optical windows, electronic-grade functional materials, and more.
QS / PRODUCT PLATFORM
MPCVD
01 / PRODUCT OVERVIEW
Product overview
Single-crystal diamond rough is feedstock block obtained after MPCVD (microwave plasma chemical vapor deposition) growth and initial cut separation, before polishing or cutting to standard substrate sizes.
This form is mainly for customers with in-house cutting and polishing capability, or for applications that require custom processing at the rough stage (e.g., specific crystal-orientation cutting or non-standard thickness slicing). After cutting and polishing, the product can be further processed into standard "single-crystal diamond" substrates (plate/circular), copper-metallized diamond, and other downstream products.
01
MPCVD growth
02 / SPECIFICATIONS
Crystal grade classification
The following crystal grades are available; specific grading criteria and inspection metrics can be provided on request:
single-crystal diamond rough
For semiconductor and electronic-device uses that need higher crystal purity and lower defect density.
For tools, structural parts, and other industrial uses where optical or electronic performance is less demanding.
For gem and consumer diamond grading (clarity, color, cut, and similar). The criteria differ from the industrial rough grades above.
| Grade | What this grade is for |
|---|---|
| Optical grade | For uses that need high optical transmittance and optical uniformity. It can be processed further into optical windows and similar optical materials. |
| Electronic grade | For semiconductor and electronic-device uses that need higher crystal purity and lower defect density. |
| Industrial grade | For tools, structural parts, and other industrial uses where optical or electronic performance is less demanding. |
| Jewelry grade | For gem and consumer diamond grading (clarity, color, cut, and similar). The criteria differ from the industrial rough grades above. |
03 / SPECIFICATIONS
Form / size / thickness / delivery specification
Standard sizes (plan-view dimensions)
7×7mm
8×8mm
10×10mm
15×15mm
20×20mm
25×25mm
THICKNESS
1–15mm
| Item | Spec | Notes |
|---|---|---|
| Delivery condition | Initial cut separation completed | Delivered as blocks after initial separation—not as-grown and not polished finished parts |
| Standard sizes (plan-view dimensions) | 7×7mm,8×8mm，10×10mm,15×15mm,20×20mm,25×25mm | Company standard specs; other sizes available on request |
| Thickness | 1–15mm | Company standard thickness range, thicker than polished finished substrates to leave material allowance for subsequent cutting |
| Deliverable quantity per lot | 69 / 85 / 650 pcs | Depends on the growth run and cutting configuration; specific quantities can be confirmed via technical inquiry |
| Crystal orientation | Available on request | Growth orientation is fixed during growth; rough is delivered as blocks, so the final working-face orientation depends on subsequent cutting. Common industry orientations are (100), (110), and (111); specific orientation can be confirmed by orientation testing |
04 / TECHNICAL HIGHLIGHTS
Material parameters
1800–2200
W/(m·K)
thermal conductivity
1.0–1.5
10⁻⁶/K
thermal expansion coefficient
3.51–3.52
g/cm³
Density
10
—
Mohs hardness
| Item | Unit | Value | Notes |
|---|---|---|---|
| thermal conductivity | W/(m·K) | 1800–2200 | High-quality CVD single-crystal diamond reference value; the actual inspection report prevails |
| thermal expansion coefficient | 10⁻⁶/K | 1.0–1.5 | CVD single-crystal diamond materials reference values |
| Density | g/cm³ | 3.51–3.52 | Physical constant of diamond |
| Mohs hardness | — | 10 | Intrinsic properties of diamond materials |
| Young's modulus | GPa | Available on request | Published industry reference range |
| volume resistivity | Ω·cm | Available on request | Published industry reference range |
| Surface roughness / bow | — | Not applicable | Rough is unpolished feedstock; this metric applies to polished finished substrates |
| Optical transmittance / refractive index | — | Not applicable | Measurable only after polishing; for optical-grade products, see "Diamond Optical Window" |
05 / PROCESSING CAPABILITY
Secondary processing directions
STEP 01
Custom cutting (orientation, thickness slicing), polishing, and other secondary processing available; scope confirmed against capacity and requirements.
STEP 02
After cutting and polishing, can be further processed into standard "single-crystal diamond" substrates (plate/circular), copper-/aluminum-metallized diamond, and other downstream functional materials.
STEP 03
For specific crystal orientation, purity grade, or surface finishing, submit requirements via technical inquiry for R&D feasibility assessment.
06 / APPLICATIONS
Application fields
For customers with in-house cutting/polishing capability, for secondary processing into custom substrates or functional parts
Feedstock materials platform for optical windows, electronic-grade functional materials, and other downstream products
Base sample source for materials evaluation, process development, and frontier R&D scenarios
Jewelry-grade rough: some customers buy rough and complete subsequent cutting, polishing, and jewelry-grade processing themselves, without relying on finished consumer diamonds from us
Jewelry-grade rough is evaluated under gemological criteria (clarity, color, cut, etc.) that differ from the industrial materials grading used for optical-/electronic-/industrial-grade rough. Specific grading bases can be provided on request.
07 / QUALITY & VALIDATION
Inspection and documentation
Related inspection reports available on request from the company.
CONTACT
Technical inquiry
Standard specs: 7×7 mm, thickness 4–10 mm; other sizes available on request
Optional crystal grades: optical, electronic, industrial, jewelry
Customization: crystal orientation, thickness slicing, cut sizes, and surface finishing—all available on request