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GY AluminaProtection Tubes · Insulators · Crucibles
Illustrative image (AI-generated): the glowing hot zone of a crystal-growth furnace lined with white ceramic parts.

Customers

Trusted by semiconductor, instrument and furnace makers.

Our tubes, insulators and crucibles go into crystal-growth furnaces, thermocouples and industrial furnaces. These are some of the companies that order from us again and again.

Illustrative

Track record

pieces shipped, 2024⁠–⁠2026
1.4 million+
shipments since 2024
1,380+
customers ordering in 2026
43
customers with 10 or more shipments each
33
years in operation
42

We supplied thermocouple protection tubes for the expansion of China’s solar industry.

Figures from our 2024⁠–⁠2026 sales records.

Selected customers

Companies that order from us

What each company does, and what we supply to it. Company facts are public, from their own websites and stock-exchange filings.
Illustrative image (AI-generated): polished dark gallium arsenide wafers fanned out beside a single-crystal ingot.Illustrative

Compound semiconductor substrates

01 / 07

Beijing Tongmei Xtal

AXT, Inc. (NASDAQ: AXTI)

Beijing, China

  • Parent: NASDAQ AXTI
  • Founded 1998
  • VGF crystal growth

The China manufacturing subsidiary of AXT, Inc. of Fremont, California. It grows indium phosphide, gallium arsenide and germanium single crystals by AXT’s vertical gradient freeze (VGF) method and turns them into substrate wafers. The wafers go into optical transceivers for data centres, 5G power amplifiers, lasers and LEDs, and solar cells for satellites.

Seven short twin-bore insulators held end-on between thumb and finger over a bamboo sieve full of the same pieces.

What we supply

Corundum twin-bore insulators for crystal-growth furnaces

Crystals of high-purity gallium metal.Photo: en:user:foobar, CC BY-SA 3.0

Compound semiconductor substrates

02 / 07

Vital Micro-electronics

Vital Materials group

Qingyuan, Guangdong, China

The compound-semiconductor substrate business of Vital Materials, a Guangzhou-based group. It makes gallium arsenide and indium phosphide substrate wafers, including indium phosphide wafers for the optical modules in AI data centres. The group, started in 1995, works in minor and rare metals, from refining and recycling to thin-film and infrared materials.

  • Group founded 1995
  • GaAs and InP substrates
  • Group: 18,000+ employees
Seven short twin-bore insulators held end-on between thumb and finger over a bamboo sieve full of the same pieces.

What we supply

Corundum twin-bore insulators for crystal-growth furnaces

Illustrative image (AI-generated): polished optical glass blanks and lens elements on dark slate.Illustrative

Optical glass

03 / 07

CDGM Glass

Chengdu, Sichuan, China

One of the world’s largest optical glass makers. Founded in 1956, it melted New China’s first industrially produced optical glass in 1958. Today it makes optical, special and functional glass, from infrared and laser glass to zero-expansion glass-ceramics, as well as spherical and aspheric lenses.

  • Founded 1956
  • China’s first industrial optical glass, 1958
  • China South Industries Group
A long row of finished alumina tubes laid side by side on a plain grey background.

What we supply

Alumina tubes and insulators

Illustrative image (AI-generated): a spool of bright amorphous metal ribbon and wound ribbon cores on a steel bench.Illustrative

Amorphous and nanocrystalline alloys

04 / 07

AT&M Amorphous Technology

AT&M group

Beijing and Zhuozhou, Hebei, China

A wholly owned subsidiary, set up in 2011, of Advanced Technology & Materials (AT&M), the Shenzhen-listed materials company of the China Iron & Steel Research Institute Group. It makes wide iron-based amorphous alloy ribbon for power transmission and distribution, power electronics, new energy and transport. The AT&M group also makes nanocrystalline ribbon and cores.

  • Parent: SZSE 000969
  • Founded 2011
  • China Iron & Steel Research Institute Group
Large-diameter ceramic tubes stacked on their sides, showing the open ends and wall thickness.

What we supply

Open-ended corundum tubes

A lustrous piece of germanium.Photo: Hi-Res Images of Chemical Elements, CC BY 3.0

Compound semiconductor substrates

05 / 07

Yunnan Xinyao Semiconductor

Yunnan Germanium group

Kunming, Yunnan, China

Makes gallium arsenide and indium phosphide substrate wafers for Yunnan Germanium (Yunnan Lincang Xinyuan Germanium Industry), which is listed in Shenzhen. The parent mines germanium and makes germanium ingots, germanium wafers for space solar cells, infrared optics and materials for optical fibre, and reports itself as China’s largest producer of germanium products.

  • Parent: SZSE 002428
  • Group capacity: 800,000 GaAs wafers a year
  • China’s largest germanium producer (group)
Seven short twin-bore insulators held end-on between thumb and finger over a bamboo sieve full of the same pieces.

What we supply

Corundum twin-bore insulators for crystal-growth furnaces

Illustrative image (AI-generated): industrial thermocouple assemblies with white ceramic protection tubes, a glowing furnace behind.Illustrative

Thermocouples and temperature instruments

06 / 07

Chongqing Dazheng Instruments

Beibei, Chongqing, China

Makes temperature sensors: thermocouples, including tungsten-rhenium and mineral-insulated types, resistance thermometers, compensating cable and heaters, and takes on instrument-control projects. Its sensors serve petroleum, chemicals, power, metallurgy, pharmaceuticals, heat treatment and aerospace.

  • NEEQ 872715
  • Incorporated 2001
  • National high-tech enterprise
Bundles of long cream-coloured alumina protection tubes with closed ends, tied with yellow bands, on a plain grey background.

What we supply

Thermocouple protection tubes and multi-bore insulators

Illustrative image (AI-generated): a laboratory tube furnace glowing orange, with crucibles and fine metal wire samples on the bench.Illustrative

Materials research

07 / 07

Chongqing Materials Research Institute

Sinomach

Chongqing, China

Founded in 1961 and part of Sinomach since 1999, the institute researches and makes functional materials: special alloys, precious and refractory metals, and sensors, including platinum-rhodium thermocouple wire and nuclear-grade mineral-insulated thermocouples. It hosts China’s National Engineering Research Center for Instrument Functional Materials.

  • Founded 1961
  • National engineering research center
  • Part of Sinomach
End-on view of a bundle of multi-bore ceramic insulators with two, four, six and more bores, on a plain grey background.

What we supply

Alumina tubes and insulators

Company names and logos belong to their owners. They are shown to identify our customers, not as an endorsement. Company information as of September 2026.

By industry

What they buy from us

  • 01

    Thermocouple and temperature-instrument makers

    Protection tubes and multi-bore insulators, with repeat orders every few weeks.

    Including Chongqing Dazheng Instruments

  • 02

    Semiconductor and crystal-growth substrate makers

    Flat twin-bore insulators for crystal-growth furnaces.

    Supplier to Beijing Tongmei Xtal, the China manufacturing subsidiary of NASDAQ-listed AXT Inc.

    Including Beijing Tongmei Xtal, Vital Micro-electronics, Yunnan Xinyao Semiconductor

  • 03

    Furnace and heating-equipment builders

    Furnace tubes, drilled and threaded tubes, and parts made to their drawings.

  • 04

    Steel and metallurgy

    Open-ended corundum tubes and parts made to drawing.

    Including AT&M Amorphous Technology

  • 05

    Research institutes and laboratories

    Crucibles and boats, insulators and tubes.

    Including Chongqing Materials Research Institute

  • 06

    Export partners

    Our tubes and insulators are in use in Europe and South Korea through export partners.

Image credits

Images marked “Illustrative” are AI-generated scenes of each industry. They do not show the customers’ own plants or products.

Photos from Wikimedia Commons: Gallium crystals.jpg (en:user:foobar, CC BY-SA 3.0); Germanium (32 Ge).jpg (Hi-Res Images of Chemical Elements, CC BY 3.0).

Product photos: our own, taken at the factory.

Request a quote

Start with samples, then order at volume.

Tell us the dimensions, grade and quantity. A contractual datasheet with current, product-specific test data and tolerances comes with each quotation.

Request a quotesales@gyalumina.com
Custom parts, usually from
100 pcs
Samples for approval
5–10 pcs
Production, usually
25–30 days
Standard sizes from stock, small to bulk orders
~3⁠–⁠7 days