Across architectural curtain walls, sightseeing elevators, high-end bathroom fixtures and cold chain display cabinets, demand for small-radius curved tempered glass is growing fast. Yet the industry has long faced three common pain points: limited minimum radius, poor precision control, and inability to produce curved glass with straight sections.
Many contractors and buyers repeatedly ask: Can you make R300 small-radius curved tempered glass? What is the smallest radius for curved tempered glass with straight sections? Who is a reliable manufacturer of small-radius curved tempered glass in China?
As an established glass deep-processing manufacturer based in Henan, Henan Xunyuan Glass Co., Ltd. has upgraded its CNC curved tempering production line and developed in-house temperature-controlled forming technology. We have a clear answer: We can stably mass-produce R300 small-radius curved tempered glass, and produce straight-section curved tempered glass starting from R350mm radius. All our products fully comply with China’s national safety standards for tempered glass.
1. Why Most Manufacturers Cannot Produce R300 Small-Radius Curved Tempered Glass
Curved tempered glass is made by heating glass to its softening point, then shaping it with mechanical forming equipment and rapidly cooling it with air to set the curve and strengthen the glass.
The smaller the radius, the harder it is to control stress distribution during forming. Breakage rate and optical distortion rise exponentially as radius decreases. In the general industry, most glass factories only produce curved tempered glass with a radius of R500 or larger — and the minimum radius goes up for thicker glass.
Producing R300 and smaller radii sets high demands on equipment precision, temperature control systems, air grille matching and forming molds:
Temperature difference across heating zones must be kept within ±1℃ to ensure uniform softening of the entire glass sheet
Servo-driven forming rollers must achieve millimeter-level precision to avoid ripples or unevenness on the curved surface
Quenching air pressure must be zoned and adjusted to prevent self-breakage caused by uneven stress between the arc top and edges
For products with straight sections, manufacturers must also solve the industry-wide problem of stress concentration at the straight-to-curve transition zone
This is why many buyers shopping for R300 or R350 curved glass get turned away with responses like “we can’t make it”, “low yield rate”, or “we can only do hot-bent glass, not tempered”.
2. R300 Small-Radius Curved Tempered Glass: Stable Mass Production at Xunyuan Glass
For R300-grade small-radius curved tempered glass, Henan Xunyuan Glass has achieved stable batch production. We work with standard float glass and ultra-clear glass, and support combined processing including tempering, laminating, insulating and coating.
Core Technical Advantages
Precision temperature-controlled heating systemWe use zoned convection heating furnaces to keep glass softening temperature uniformity within ±2℃, reducing forming stress differences from the source.
CNC flexible forming mechanismServo motors drive rollers to precisely match the curve. Sag deviation of the curved surface is ≤±1.5mm, and optical distortion is far below the industry average.
Gradient air-cooled tempering processWe apply differentiated air pressure matching the curvature change to ensure uniform compressive stress on the glass surface. The fragmentation state fully meets the safety requirements of GB 15763.2.
Full-dimensional inspectionEvery batch goes through three checks: arc verification, stress testing and appearance quality control, to ensure no defective products leave the factory.
Whether you need full-arc small-radius curved tempered glass, or custom sizes with shaped edges and drilled holes, Xunyuan Glass can process accurately according to your drawings, solving the implementation challenges of small-radius curved surfaces in engineering design.
3. Curved Tempered Glass with Straight Sections: Starting from R350mm, One-Piece “Straight + Curve + Straight” Forming
In real projects, pure curved glass often cannot meet installation needs. Curved tempered glass with straight sections (also called J-shaped or U-shaped curved glass) is more widely used — for example, spiral staircase railings, curtain wall closures, sightseeing elevator enclosures and curved canopies all require straight sections on one or both ends for fixing and connection.
Compared with full-arc curved glass, straight-section curved glass is much more difficult to produce: stress concentrates at the transition between straight and curved sections, and air pressure matching is challenging. Conventional equipment often causes insufficient tempering on straight sections, cracking at transition zones, or arc springback.
Most manufacturers in the industry can only produce straight-section curved tempered glass down to R500 radius, with strict limits on straight section length. Henan Xunyuan Glass has broken through this industry bottleneck by optimizing forming molds and zoned air control technology:
Straight-section small-radius curved tempered glass available from R350mm radius, covering mainstream project specifications
Supports single straight section, double straight sections, unequal-length straight sections and other custom structures
Smooth straight-to-curve transition with no sudden stress change; tempering strength matches that of full-arc products
Processable thickness: 5mm–15mm; arc length and panel size fit most construction projects
4. Why Choose Xunyuan Glass for Small-Radius Curved Tempered Glass
1. Original manufacturer with guaranteed cost-effectiveness and delivery
Henan Xunyuan Glass owns its own production base and full set of deep-processing lines. There are no middlemen marking up prices, and we control the entire process from raw glass procurement to finished product delivery. For high-difficulty orders like small-radius curved tempered glass, we assign a dedicated technical team to quickly complete drawing review, sample making and mass production, with stable and controllable lead times.
2. Full-range deep processing, one-stop solution
In addition to small-radius curved tempering, we also offer laminating, insulating, Low-E coating, frosting, drilling, edge polishing and other processing services. We meet the composite functional needs of curtain walls, doors and windows, bathrooms, display cabinets and other scenarios, reducing communication and logistics costs for customers who would otherwise source from multiple suppliers.
3. Strict quality control system, compliant with national testing standards
All products are produced in strict accordance with the national standard Safety Glass for Building Use – Part 2: Tempered Glass. Each piece is inspected for arc precision, appearance quality and stress performance before delivery. We can provide corresponding test reports to meet various project acceptance requirements.
4. Nationwide delivery, support for custom engineering solutions
Based in Henan, we serve markets across China. We provide customized curved tempered glass solutions for curtain wall contractors, decoration companies and equipment manufacturers nationwide. We offer the same standard of technical support and after-sales service for both small-batch samples and large project orders.
5. Applications & Technical Specifications
Common Applications
Curved architectural curtain walls, curved skylights, canopy closures
Sightseeing elevators, spiral staircase glass railings
High-end shower rooms, curved bathroom glass
Cold chain display cabinets, curved glass for commercial display cases
Curved protective covers for machinery, special glass components
Core Processing Parameters
Small-radius curved tempered glass: starting from R300 radius
Curved tempered glass with straight sections: starting from R350mm radius; supports straight+curve+straight one-piece structure and other special-shaped curved glass
Panel size: compatible with most construction project dimensions
Combined processes: tempering, laminating, insulating, coating, ultra-clear glass, etc. — all customizable
If you are looking for a reliable small-radius curved tempered glass manufacturer, or have custom needs for R300, R350 or other small-radius curved glass with straight sections, welcome to contact Henan Xunyuan Glass Co., Ltd. As an experienced original glass deep-processing factory, we will provide you with accurate technical solutions, stable product quality and competitive quotes to help your project proceed smoothly.
Henan Xunyuan Glass Co., Ltd.Specializing in curved tempered glass, ultra-wide tempered glass and special-shaped glass deep processingCustom-made on demand | Nationwide supply
Contact Us
No matter how complex your project or how special your size requirements,Henan Xunyuan Glass Co.,
Ltd. is confident in providing you with the best solution. Welcome to call us for consultation or visit our factory!
Phone/WeChat: +86 13777572571 (WeChat ID same as phone number, welcome to add for consultation)
Email: 184626996@qq.comAddress: North Huayu Avenue, Zhandian Industrial Park, Wuzhi County, Jiaozuo City, Henan Province, China
Note: For other special specifications or custom sizes, please feel free to call us. We will evaluate and quote for you in detail.