FLK / Sealmann (Ningbo)
宁波伏尔肯科技集团股份有限公司
FLK makes silicon-carbide process hardware for PV tools to customer drawings. Its boat holder, crystal boat and furnace tube are separate products, and each is quoted with its own material, geometry and operating conditions.
Supplier at a glance
- Location
- Ningbo, Zhejiang
- Equipment listed here
- Process ceramic parts
- PV product groups
- Boat holders, fluidized-bed liners and structural parts, and SiC pipework. [2]
- Standards work
- Named among the drafters of standards plan 20250754-T-609, shown at approval stage. [8]
- Profile sources
- 9 named sources; source list
Company scope
What the company makes
The Chinese company name is 宁波伏尔肯科技集团股份有限公司, and the FLK/Sealmann website shows engineering ceramics next to fluid-equipment components. On its photovoltaic page, FLK describes silicon-carbide parts shaped by additive forming, then sintered and precision machined. The PV product groups named there are boat holders, high-temperature fluidized-bed liners and structural parts, and SiC pipework.
The boat-holder entry names PV and semiconductor use and offers manufacture to the customer's drawing. It lists no dimensions, load, purity or temperature figures for the holder, so those values come from your drawing and the agreed quote.
Two outside records add context. A national standards-plan entry lists the company among the drafters of a tensile-creep test method for monolithic ceramics, shown at approval stage when checked. A 2026 college recruitment notice names FLK and describes CNC grinding of SiC ceramic products. For an order, turn FLK's material and forming options into a controlled drawing, a stated production route and an agreed acceptance record.
Equipment portfolio
Start with the actual equipment
The entries below cover selected products and series from this manufacturer. Ask for the full catalogue if your project needs other models.
Silicon carbide PV boat holder →
FLK's silicon-carbide boat holder supports wafer boats in PV and semiconductor process tools and is made to the buyer's drawing. The holder page describes stability, thermal-shock resistance and low expansion, with no numerical load, purity, tolerance or temperature figures. Send the mating… [3]
Specifications & selection questions →Separate catalogue entries
FLK's holder, crystal boat and tube each carry their own figures
| Entry | What FLK publishes | For a holder quote |
|---|---|---|
| SiC boat holder | Carrier for PV and semiconductor tools, made to drawing | Ask FLK for load, purity and operating figures for your design |
| Crystal boat | Semiconductor thermal-process part with impurity figures for substrate and coated form | Those figures belong to the boat; request the holder's own material record |
| Furnace tube | Custom high-temperature structure with two different temperature statements | Agree the holder's operating range on its own terms |
| PV application page | 3D forming, sintering, precision machining and general benefits | Confirm material, coating and route for your drawing |
The tube page gives long-term use at 1200–1350 °C in one place and a 1300° maximum in another. Ask FLK which figure applies to the tube; the holder needs a rating of its own. [3][4][5][2]
Impurity figures belong to the crystal boat
FLK's crystal-boat entry gives substrate impurities below 200 ppm, and below 50 ppm after coating, for semiconductor oxidation, diffusion and MOCVD use. For a holder, ask FLK to name the material grade and the test method it will report for your part. In a PV factory, boats and their holders serve the diffusion and deposition furnaces of cell production, so name the tool the holder will sit in. [4][3]
How FLK makes the parts
Put the material, forming route and finishing records into the quote
Pick the SiC grade and surface
FLK's catalogue shows several SiC material families. State the grade you need, any coating, contamination limits and the process atmosphere, so the quote names one material for your holder. [1][2][3]
Match forming and machining to the drawing
The PV page describes additive forming, sintering and precision machining. FLK's R&D page covers preparation, forming, sintering, finishing and testing. Ask which steps your part goes through, how the critical supports are finished and how dimensions are measured once finishing is done. [2][6]
Name the producing site
FLK's introduction mentions several manufacturing bases. The contact page gives Jinyuan Road 666, and the 2026 college recruitment notice gives a CNC grinding work location at Mingguang Road 636. Ask which site makes and inspects your part and which company signs the contract. [1][7][9]
Part approval
Check support stability and cleaning under your own process
Loading capacity in practice
FLK promotes one-piece construction and large loading capacity on its PV page. A holder quote still rests on the boat and support geometry, load distribution, travel and temperature duty. Ask for tolerances and for deformation or creep acceptance under your conditions. [2][3]
Acid-free cleaning
FLK says its PV parts avoid acid cleaning and last longer. Before changing a cleaning method, agree process residues, permitted chemicals, handling and inspection with your tool and process owner, and ask FLK for any cleaning procedure or cycle history it has for this holder. [2][3]
Standards plan 20250754-T-609
The national standards platform lists FLK among the drafters of this tensile-creep test method for monolithic ceramics, at approval stage when checked. It shows that FLK takes part in standards work. If you need creep data or a compliance document for the holder, request it with the quotation. [8]
Project fit
Match the offering to your project
Drawing-based enquiries for SiC support hardware in a defined PV process tool.
Projects that can state the boat and support layout, thermal duty, atmosphere, surface or coating state and acceptance criteria.
Confirm before ordering
- Load, deflection and creep limits, purity, temperature rating and expected life for the holder you order.
- Whether acid-free cleaning, low contamination and longer life hold for your installed part and supplied lot.
- The current registered company, producing site, valid certificates and permission to use FLK product images.
Built from FLK's company, PV, holder, crystal-boat, tube, R&D and contact pages, with the national standards plan and a 2026 college notice for context. The tube's two temperature figures are flagged for FLK to settle.
Certificates & approvals
Approvals on file
No factory audit or equipment certificate is on file for this manufacturer yet. Ask for current certificates, with their scope and validity, in your quotation request.
Prepare before contacting
Your Silicon carbide PV boat holder enquiry checklist
Tick the questions that apply to your project, then take them into your sourcing request. Ticking an item here does not contact the manufacturer.
Your selections remain on this page and are cleared on reload. Download or print to keep a copy. No checklist selections are uploaded.
Continue to sourcing requestBuyer questions
Is the FLK holder the same as its crystal boat?
They are separate entries with separate jobs. The holder quote names the mating boat, the supports and the load, and the boat's impurity figures stay with the boat. [3][4]
Can I use 1350 °C from the tube page for the holder?
That figure belongs to the furnace tube, and the tube page gives two different temperature statements. Ask FLK for the holder's own operating conditions and acceptance data. [5][3]
Can acid cleaning be dropped altogether?
FLK presents it as a benefit of its PV parts. Agree material, coating, residues and permitted cleaning with your process owner before changing a cleaning procedure. [2]
Is the holder certified to the standards plan?
The plan entry lists FLK as a drafter of a test method at approval stage. Ask FLK for a holder compliance document or creep report if your order needs one. [8]
Sources
Where this information comes from
FLK's PV holder range and its standards-plan role are described here; part approval, the producing site and current certificates come with FLK's quote.
Company facts come from the publications listed below, each with the date it was checked. The project-fit notes and enquiry checklist are our buying guidance.
- FLK/Sealmann company introduction ↗Company page · Checked Live 2026-10-11
Engineering-ceramics range and group manufacturing bases.
- FLK photovoltaic applications ↗Application page · Checked Live 2026-10-11
PV part groups, forming route and stated benefits.
- Silicon-carbide boat holder ↗Product page · Checked Live 2026-10-11
PV and semiconductor carrier made to drawing; no table of figures.
- Crystal boat ↗Product page · Checked Live 2026-10-11
Semiconductor boat with its own impurity figures.
- Furnace tube ↗Product page · Checked Live 2026-10-11
Tube with two different temperature statements.
- FLK R&D capability ↗Company capability page · Checked Live 2026-10-11
Preparation, forming, sintering, finishing and testing capability.
- FLK contact page ↗Contact page · Checked Live 2026-10-11
Company name and contact address.
- National standards plan 20250754-T-609 ↗National standards platform record · Checked Live 2026-10-11; shown in approval
Lists FLK among the drafters of a ceramics test method.
- FLK spring recruitment notice, college site ↗College employment notice · Checked Live 2026-10-11; publication displays 2026-04-17
Company name, CNC grinding of SiC and a work address.
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