Insulated

The G3® Warm Edge Spacer is a proven, high-performance spacer solution trusted across a wide range of commercial and specialty applications. An extruded thermoset structural silicone foam with integrally incorporated molecular-sieve desiccants, the G3 is engineered to outperform traditional metal spacers in thermal efficiency, durability, and long-term seal integrity.

Unlike conventional aluminum spacers, the G3’s fully non-metallic silicone composition delivers true warm-edge performance with no metal bridging to conduct heat or cold. Its thermoset construction means the spacer is permanently cured into shape — it won’t soften or deform under heat — while retaining flexibility across a wide temperature range to accommodate the natural movement of an IGU through thermal cycling.

• True Warm Edge Performance — No metal components, no thermal bridging
• Improved U-Values — Typical improvement of 0.2 W/m·K vs. aluminum spacers
• Higher Condensation Resistance — Warmer edge temps reduce perimeter condensation and mold risk
• Superior Gas Retention — PIB primary seal and multi-layer vapor barrier maintain a lasting gas-tight seal
• Dual Seal Performance — Acrylic structural adhesive plus perimeter sealant for long-term edge integrity
• Fast Dew-Point Drop — Molecular-sieve desiccant pre-fill absorbs moisture quickly and consistently
• Excellent Environmental Resistance — Resists UV, ozone, oxidation, and color fade
• Enhanced Sound Dampening — Silicone foam outperforms rigid metal spacers acoustically
• Code Compliant — Meets ASTM E2190 and International Green Construction Code standards
• Ideal for High-Performance Applications — Suited for hospitals, medical facilities, and specialty projects

G3® Warm Edge Spacer is available in Black, Grey, and Aluminum Grey.

The G4 TPS Spacer represents the next generation of warm-edge spacer technology. An advanced reactive thermoplastic system with a built-in desiccant, the G4 is engineered to replace traditional spacer, desiccant, and primary seal components in a single, streamlined application — simplifying fabrication without compromising performance.

Unlike conventional aluminum spacers, the G4 chemically bonds to both the glass and silicone secondary seal, forming a permanent molecular connection that resists separation over the life of the unit. Its flexible thermoplastic composition distributes stress evenly across the full width of the spacer — rather than concentrating it at the edges — allowing the unit to expand and contract through thermal cycling while maintaining a continuous gas-tight seal.

Key Advantages

• Unlimited Design Flexibility — Compatible with any IGU size, shape, or weight
• Superior Gas Retention — Continuous airtight seal maintained through all expansion and compression cycles
• Outstanding Thermal Performance — Low thermal conductivity reduces heat loss and lowers long-term energy costs
• Low Moisture Vapor Transmission — Prevents condensation and moisture intrusion for improved comfort and air quality
• Chemical Bonding to Glass and Silicone — Permanent molecular bond enhances durability and structural integrity over the life of the unit
• Exceptional Durability — Flexible and stable under temperature extremes and climatic stress cycling
• Aesthetically Seamless — Metal-free matte black finish blends cleanly with modern frame systems for a refined edge profile
• Advanced Thickness Control — Ensures precise spacer application and consistent IGU performance unit to unit
• Environmentally Responsible — Made from metal-free, organic materials that reduce energy use and environmental impact

G4 TPS Spacer is available in matte black only.

Glasswerks IGUs are engineered to deliver measurable performance advantages over single-pane and standard double-pane alternatives.

Thermal Efficiency

• Sealed argon or dehydrated air cavity significantly reduces conductive and convective heat transfer
• Lower U-values compared to single-pane and standard double-pane glass
• Supports ENERGY STAR® compliance and green building certification requirements
• G4 warm-edge spacer further reduces edge-of-glass heat loss for enhanced overall unit performance

Condensation Resistance

• Integrated desiccants absorb residual cavity moisture, preventing interior condensation
• G4’s low moisture vapor transmission rate provides an additional barrier against moisture intrusion
• Contributes to healthier interior air quality in occupied spaces

Acoustic Performance

• Sealed cavity provides meaningful sound attenuation versus monolithic glass
• Suitable for projects near high-traffic corridors, airports, transit hubs, and urban environments
• Can be enhanced further with laminated interlayers for projects with stringent STC requirements

Code Compliance & Standards

• Produced in accordance with ASTM E2190
• Compliant with Insulating Glass Certification Council (IgCC) standards

Glasswerks IGUs are fabricated in-house and engineered to integrate with our full range of value-added glass processing capabilities — giving architects, glaziers, and design-build teams a single source for complex, high-performance assemblies.

• Laminated Glass — Incorporate PVB or SGP interlayers for enhanced safety, security, blast resistance, and acoustic performance; available in dual- and triple-pane IGU configurations
• GlassFX — Add decorative digital ceramic frit imagery, patterns, or gradients for design-forward façade and interior applications
• Silkscreen — Apply custom silk-screened patterns, branding, or graphic elements directly to the glass surface with precision and repeatability
• Spandrel — Available in painted or filmed configurations for opaque vision-line coverage; compatible with standard and custom color matching
• Bent Glass — Curved IGUs fabricated for radius and compound-curve applications up to 130″ × 100″; available with both G3 and G4 spacer systems

All fabrication is performed to customer specification. Our team works closely with glaziers, architects, and design-build contractors to ensure each unit meets project tolerances and performance targets before it leaves our facility.