Specialty glass, cut and polished to spec
Borosilicate, quartz, optical and photovoltaic glass — sourced from Chinese glass houses with the right melting, polishing and coating capability for your application.
Request a QuoteSpecialty glass is a precision discipline
Specialty glass is the family of glass products engineered for performance — thermal shock resistance, optical clarity, chemical durability, electrical isolation, light transmission. It includes borosilicate (Pyrex-class), fused quartz, BK7 and other optical crowns and flints, low-iron solar glass, sodium-free LCD substrates and aluminosilicate cover glass.
It is also a precision discipline. The same melt can produce a usable substrate or a rejected one depending on annealing schedule, polish quality, edge chamfer and coating uniformity. The mistake most buyers make is treating it as a commodity. The mistake the supplier makes is treating it as art. Sourcing Captain runs it as a manufacturing process: spec sheet, sample, qualification, contract, inspection.
We cover blanks, plates, tubes and rods in standard sizes, plus custom-cut and polished parts down to ±0.05 mm dimensional tolerance. We also broker AR, IR and conductive coatings (ITO, FTO) where the application requires them — sourced from coater partners who have already qualified under our audit.
Why a glass project needs in-country oversight
Specialty glass is fragile in transit and unforgiving in spec. Two failure modes account for most rejected shipments: optical defects that the mill called acceptable but the buyer's spec called critical, and chip damage on the polished edges from packaging that did not protect the parts in a 30-day ocean voyage. Both are preventable with on-site QC. Neither is preventable from a thousand miles away.
Sourcing Captain inspects the polish under controlled lighting, signs off on the foam-lined wood crates before they seal, and books vessel positions away from the coldest holds. Global buyers come to us when an earlier order arrived with 18% rejection. They stay because the next order arrives clean.
Our glass sourcing workflow
Spec & drawings
Glass type, dimensions, tolerance, polish grade, coating and any optical performance metrics.
Glass house pick
We match the spec to a vetted melter and a separately vetted polishing partner where needed.
Sample run
A small lot for dimensional and optical inspection at our China QC office.
Production PO
Locked-price PO with annealing schedule and inspection criteria written in.
PSI & crating
On-site inspection under controlled light, then signed-off custom crating before shipment.
Glass order deliverables
Dimensional report
CMM or optical comparator measurements against the drawing for every part or representative sample.
Optical inspection
Defect map showing scratches, digs, bubbles and inclusions against the agreed visual standard.
Coating data
Where applicable, transmission/reflection curves and sheet resistance for conductive coatings.
Annealing log
Annealing schedule from the glass house, signed and dated.
PSI photos & video
Pre-shipment photo and video record of crating and labelling.
Sample retain
A retained part held in our warehouse for downstream QA referencing.
Specialty glass FAQs
Which glass families do you cover?
Borosilicate (33 and 51 expansion), fused quartz (UV/IR/optical grades), aluminosilicate cover glass, BK7 and other optical crowns and flints, soda-lime float, low-iron solar glass, and sodium-free display substrate. For specialty glasses (chalcogenide, fluoride) we will tell you up front whether the order is feasible.
How tight a tolerance can you hold?
For cut blanks we routinely hold ±0.1 mm; for polished optics we work to ±0.05 mm or tighter on dimensions and ¼-wave on figure. Tighter than that becomes specialty optics work and we handle it with separate optics partners.
Do you supply coated glass?
Yes — anti-reflective, low-emissivity, conductive (ITO, FTO) and protective coatings on the glass blanks we supply. Coating houses are audited under the same process as the glass houses.
How is the glass packed for ocean freight?
Custom plywood crates with cell separators, foam interleaves, desiccants and tilt indicators. We sign off on every crate before sealing and the photos are part of the PSI report.
What if a piece arrives damaged?
We inspect the container at destination through our agent network if requested, and we backstop the supplier — replacement parts air-shipped at our cost when packaging or production is at fault. The contract spells the responsibility split out before the order is placed.
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Tell us what you need to source
Send specs, target volumes, and timelines. Our sourcing team replies within one business day with a sourcing plan and price guidance.