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Quick Details
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Warranty:
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According to the contract
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Shape:
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Curve Flat
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Appearance:
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Bent Tempered Flat Tempered
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Standard:
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GB/T19001-2016
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Steel Degree:
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Tempered Glass Half- Tempered Glass Super- Tempered Glass
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Thickness of Flat Tempered Glass:
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19mm 15mm 12mm 10mm 8mm 6mm 5mm 3.4mm
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Thickness of Curve Tempered Glass:
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19mm 15mm 12mm 10mm 8mm 6mm 5mm 3.4mm
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Fragment State:
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I II III
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Technics:
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Physically Tempered
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Flatness:
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Conforming Article High Class
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Usage:
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Building Furniture
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Payment:
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Other
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Export Port:
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Qingdao
Quick Details
Product Highlights
1. What Is Semi Tempered Glass?
- Enhanced Strength: 2x stronger than standard annealed glass
- Controlled Breakage: Breaks into larger fragments that typically remain in the frame—prevents falling glass hazards
- Thermal Stability: Better resistance to thermal stress than annealed glass
- Post-Breakage Integrity: Remains intact in frame after breakage, maintaining barrier function
- Fabrication Flexibility: Can be cut, drilled, and edged after strengthening (unlike fully tempered glass)
2. The Manufacturing Process
| Stage | Description |
|---|---|
| Glass Cutting | Precision cutting of annealed glass to specified dimensions |
| Edge Processing | Grinding and polishing of edges before heat-strengthening |
| Hole Drilling / Notching | Cutouts, holes, and notches processed prior to strengthening |
| Heating | Glass heated uniformly to 650–700°C in a tempering furnace |
| Controlled Cooling | Glass cooled at a controlled rate—slower than full tempering |
| Surface Compression | Creates surface compression of 24–52 MPa |
| Inspection | Optical quality, dimensional accuracy, and compression testing |
Key Benefits
| Benefit | Description |
|---|---|
| 2x Strength | Approximately twice the strength of annealed glass—ideal for applications requiring enhanced durability without full tempering |
| Controlled Breakage | Breaks into larger fragments that typically remain in the frame—reduces risk of falling glass |
| Thermal Stress Resistance | Withstands thermal stress better than annealed glass—suitable for spandrel and high thermal load applications |
| Post-Breakage Integrity | Maintains barrier function even after breakage—critical for curtain wall applications |
| Fabrication Flexibility | Can be cut, drilled, and edged after heat-strengthening (within limitations) |
| Optical Quality | Less distortion than fully tempered glass—superior optical clarity |
| Cost-Effective | More economical than fully tempered glass for non-safety applications |
Performance Characteristics
| Property | Semi Tempered (Heat-Strengthened) | Fully Tempered | Annealed |
|---|---|---|---|
| Surface Compression | 24–52 MPa (3,500–7,500 psi) | 69–103 MPa (10,000–15,000 psi) | 0 MPa |
| Edge Compression | 24–48 MPa (3,500–7,000 psi) | 67 MPa (9,700 psi) minimum | 0 MPa |
| Strength (relative) | 2x annealed | 5–7x annealed | 1x |
| Breakage Pattern | Large fragments (remain in frame) | Small granules | Sharp shards |
| Thermal Shock ΔT | ~100°C | ~250°C | ~40°C |
| Post-Breakage Integrity | Maintains barrier | Loses integrity | Sharp fragments fall |
| Safety Glazing Rating | No (not safety glass) | Yes | No |
| Optical Distortion | Minimal | Moderate | None |
| Fabrication After Treatment | Limited | None | Unlimited |
Breakage Pattern Comparison
| Glass Type | Breakage Characteristics | Safety Rating |
|---|---|---|
| Annealed Glass | Sharp, jagged shards—high injury risk | Not safety glass |
| Semi Tempered (Heat-Strengthened) | Large fragments; typically remains in frame | Not safety glass (no safety rating) |
| Fully Tempered | Small, blunt granules—minimal injury risk | Safety glass (ANSI Z97.1, EN 12150) |
Glass Options for Semi Tempered Glass
| Glass Type | Characteristics | Best Applications |
|---|---|---|
| Clear Float | Standard clarity, slight green tint at edges | Spandrel panels, general architectural |
| Ultra-Clear Low-Iron | Crystal-clear, no green tint—water-white appearance | High-end spandrel, display applications |
| Tinted Glass | Bronze, gray, blue, green, black—reduces glare and solar heat gain | Spandrel panels, solar control applications |
| Low-E Coated | Energy-efficient, thermal insulation | Curtain walls, energy-saving spandrel |
| Reflective Coated | Mirror-like appearance, high solar control | Spandrel panels, architectural facades |
| Patterned / Textured | Decorative surface patterns | Spandrel, interior applications |
| Ceramic Fritted | Custom patterns, opacity, color | Spandrel glass, bird-safe glazing |
Applications
| Sector | Common Uses | Why Semi Tempered? |
|---|---|---|
| Spandrel Glass | Opaque areas between vision glass in curtain walls | Thermal stability; controlled breakage; can be coated/printed |
| Curtain Walls | Vision glass where safety rating not required | Enhanced strength; less distortion than tempered |
| Storefronts | Commercial storefront glazing | Strength; optical quality; cost-effective |
| Laminated Glass Base | Inner layers of laminated glass (with tempered outer layers) | Strength; controlled breakage pattern |
| Automotive | Side windows, rear windows (non-safety critical) | Strength; fabrication flexibility |
| Architectural Glazing | Interior partitions, balustrades (where safety rating not required) | Optical clarity; enhanced strength |
| Greenhouses | Horticultural glazing | Thermal stability; strength |
| Skylights | With laminated construction | Thermal stress resistance |
Spandrel Glass Applications
| Feature | Benefit for Spandrel |
|---|---|
| Thermal Stability | Withstands temperature differentials between interior and exterior |
| Ceramic Frit Compatibility | Ideal substrate for ceramic frit coatings (opaque colors) |
| Controlled Breakage | Large fragments remain in frame—prevents falling glass hazards |
| Low Distortion | Maintains flat appearance—critical for uniform facade aesthetics |
| Insulated Glass Units | Can be used as the outer lite in spandrel IGUs |
Comparison: Semi Tempered vs. Fully Tempered vs. Annealed
| Feature | Semi Tempered | Fully Tempered | Annealed |
|---|---|---|---|
| Strength | 2x annealed | 5–7x annealed | Standard |
| Safety Glass | No | Yes | No |
| Breakage Pattern | Large fragments | Small granules | Sharp shards |
| Thermal Resistance | Moderate (~100°C) | High (~250°C) | Low (~40°C) |
| Optical Distortion | Minimal | Moderate | None |
| Post-Breakage | Remains in frame | Shatters completely | Sharp fragments fall |
| Fabrication After | Limited (cutting not possible) | None | Unlimited |
| Cost | Moderate | Higher | Lower |
| Typical Applications | Spandrel, laminates, storefronts | Safety glazing, doors, railings | Interior, non-critical |
Quality Standards & Certification
| Standard | Description | Compliance |
|---|---|---|
| EN 1863 | European standard for heat-strengthened glass | Certified |
| ASTM C1048 | American standard for heat-treated flat glass (Type II) | Compliant |
| ISO 9001 | Quality management system | Certified |
| 3C Certification | Chinese safety glass certification (not applicable—semi tempered not safety glass) | N/A |
Quality Control
| Inspection Stage | Testing Method | Acceptance Criteria |
|---|---|---|
| Raw Glass | Optical quality, thickness tolerance, surface defects | No bubbles, inclusions, or scratches exceeding spec |
| Edge Processing | Edge quality, chip detection | Smooth, chip-free edges |
| Pre-Heat Treatment | Dimensional accuracy | ±0.5mm tolerance |
| Heat Strengthening | Surface compression test (polariscope) | 24–52 MPa |
| Flatness | Surface flatness measurement | Within industry standards |
| Final Inspection | 100% visual inspection, dimensional verification | Zero critical defects |
Fabrication Guidelines
| Operation | Semi Tempered | Fully Tempered |
|---|---|---|
| Cutting | Must be done before heat strengthening | Not possible after tempering |
| Drilling | Must be done before heat strengthening | Not possible after tempering |
| Edge Grinding | Must be done before heat strengthening | Not possible after tempering |
| Lamination | Can be laminated after strengthening | Can be laminated after tempering |
| Coating | Can be coated after strengthening | Can be coated after tempering |
| Screen Printing | Can be applied before strengthening | Can be applied before tempering |
Design Considerations
| Consideration | Recommendation |
|---|---|
| Safety Applications | Do not use semi tempered glass where safety glazing is required by building codes |
| Thermal Stress | Suitable for moderate thermal stress applications; use fully tempered for high thermal differentials |
| Laminated Glass | Can be used as inner plies in laminated glass with tempered outer plies |
| Spandrel Glass | Industry standard for spandrel applications with ceramic frit coating |
| Holes & Cutouts | Must be processed before heat strengthening; provide detailed drawings for feasibility |
| Edge Finish | Polished edges recommended for strength and aesthetics |
| Post-Breakage | Will remain in frame after breakage—consider this for overhead applications |
Comparison: Semi Tempered vs. Heat-Strengthened Terminology
| Term | Region | Same Product? |
|---|---|---|
| Semi Tempered Glass | Asia, some international markets | Yes |
| Heat-Strengthened Glass | Europe, North America | Yes |
| Semi-Toughened Glass | UK, Europe | Yes |
| Partially Tempered Glass | North America (less common) | Yes |
Packaging & Delivery
| Aspect | Details |
|---|---|
| Packaging | Interleaving paper between sheets; edge protectors; steel banding |
| Export Packaging | Heavy-duty wooden crates with moisture barrier |
| A-Frames | For larger quantities and oversized sheets |
| Lead Time | 10–20 days depending on complexity, quantity, and customization |
| Minimum Order | Custom per project—prototype to mass production |
Why Choose Our Semi Tempered Glass
- Precision Heat Strengthening: Advanced furnaces with computer-controlled cooling for consistent compression
- Low Distortion: Superior optical quality compared to fully tempered glass
- Fabrication Flexibility: Processing capabilities before and after heat strengthening
- Integrated Manufacturing: Cutting, edging, drilling, heat strengthening, coating, and lamination all in-house
- Spandrel Expertise: Extensive experience with ceramic frit and spandrel applications
- Quality Assurance: Rigorous testing for surface compression, flatness, and optical quality
- Global Expertise: Trusted by architects, facade consultants, and contractors worldwide
- Technical Support: Expert guidance on application suitability and design considerations
Frequently Asked Questions
| Question | Answer |
|---|---|
| Is semi tempered glass safety glass? | No. It does not meet safety glazing standards. Use fully tempered glass for safety applications. |
| Can semi tempered glass be cut after heat strengthening? | No. All cutting, drilling, and edging must be completed before heat strengthening. |
| What is the main use of semi tempered glass? | Spandrel glass, curtain walls, laminated glass inner plies, and storefronts where safety rating is not required. |
| How strong is semi tempered glass? | Approximately twice the strength of annealed glass of the same thickness. |
| What happens if semi tempered glass breaks? | It breaks into larger fragments that typically remain in the frame—reducing falling glass hazards. |
| Can semi tempered glass be laminated? | Yes. It is commonly used as inner plies in laminated glass assemblies. |
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