UGR 19 Microprismatics
Product Details:
- Material Options: PMMA for best optical performance, PC for impact resistance, and PS for cost-effective solutions.
- Thickness Range: Standard 1.2–3 mm; custom options available in 4 mm and 5 mm.
- Sheet Sizes: Standard 1220 × 2440 mm, with maximum size up to 1250 × 3050 mm.
- Glare Control: UGR <19 rating.
- Fire Safety: Certified to UL 94 (HB, V2, V0) and TP(a) rating.
- Prism Designs: Convex honeycomb, concave hexagon, and convex pyramid.
Description
Lighting should feel natural and comfortable. Our microprismatic diffuser lenses are designed to reduce glare and create a pleasant visual environment, meeting European office lighting standards (EN 12464-1) with a UGR rating below 19. That means clearer focus, less eye strain, and a more productive workspace.
Trusted by leading LED lighting brands, these prismatic sheets are widely used in offices, schools, and commercial spaces where balanced, high-quality light is essential. The precise microprism structure spreads light evenly, eliminating hotspots and delivering consistent brightness across the entire luminaire.
For projects requiring extra safety and durability, we offer TP(a) V0 fire-rated polystyrene diffusers with UV stability. This unique material resists yellowing and degradation, ensuring long-term optical performance even in demanding environments.
Different prism patterns are available, each optimized to control light refraction and maximize efficiency, giving designers and engineers flexibility to create the right atmosphere for any application.
| Product Code | Material | Standard Thickness (mm) | Standard Thickness (in.) | Light Transmittance (%) | Prism |
|---|---|---|---|---|---|
| Plexi Honeycomb | PMMA | 1.5 & 2.0 | 0.059 & 0.078 | 94 | Convex Honeycomb |
| Plexi Hexagon | PMMA | 1.5 & 2.0 | 0.059 & 0.078 | 94 | Concave Hexagon |
| Plexi Mikroprismen | PMMA | 1.5 | 0.059 | 94 | Convex Micro Honeycomb |
| Poly Honeycomb | Polycarbonate | 1.2 & 1.5 | 0.047 & 0.059 | 90 | Convex Honeycomb |
| Poly Hexagon | Polycarbonate | 1.2 & 1.5 | 0.047 & 0.059 | 90 | Concave Hexagon |
| Poly MiniHexa | Polycarbonate | 1.2 | 0.047 | 90 | Concave Mini Hexagon |
| S Honeycomb | Polystyrene | 1.2 & 1.5 | 0.047 & 0.059 | 94 | Convex Honeycomb |
| S Hexagon | Polystyrene | 1.2 & 1.5 | 0.047 & 0.059 | 94 | Concave Hexagon |
| S Honeycomb TP(a) | Polystyrene TP(a) | 1.2 & 1.5 | 0.047 & 0.059 | 94 | Convex Honeycomb |
| S Hexagon TP(a) | Polystyrene TP(a) | 1.2 & 1.5 | 0.047 & 0.059 | 94 | Concave Hexagon |
Pairing Microprismatic Sheets with Diffuser Films
In professional LED lighting, combining clear microprismatic sheets with diffuser films is a common practice to achieve a soft, opal-like glow while reducing the UGR value for comfortable, low-glare illumination.
We recommend pairing prismatic sheets with Opto90 PET225 or Opto80 PC diffuser films, both of which deliver consistent diffusion and are optimized for energy-efficient LED panels. This combination maximizes visual comfort, glare reduction, and long-term performance, making it the preferred choice for architectural and commercial lighting projects.
For added versatility, 1.2 mm and 1.5 mm translucent PMMA, PS and PC sheets can be used in more robust or demanding applications.
Other Microprismatics
While these sheets do not reach UGR <19, they are widely used in LED and fluorescent troffer fixtures to provide even light distribution and reduced glare. Different prismatic designs are available, allowing customers to customize light distribution for their specific projects.
| Product Code | Material | Standard Thickness (mm) | Standard Thickness (in.) | Light Transmittance (%) | Prism |
|---|---|---|---|---|---|
| Plexi Pyramid | PMMA | 1.5 | 0.059 | 94 | Convex Micro Pyramid |
| S Pyramid | PS | 1.8 | 0.070 | 94 | Convex Micro Pyramid |
| Plexi Pyramid 2 | PMMA | 2 | 0.070 | 94 | Convex Pyramid |
| Plexi Linear | PMMA | 2 | 0.070 | 94 | Linear |
| S Linear | PS | 1.5 | 0.059 | 94 | Linear |
| Plexi Prism508 | PMMA | Custom | Custom | 94 | P12 |
Beyond our clear prismatic sheets, we also offer opal microprismatic panels that create soft, even illumination. Discover full details and specifications on their dedicated product page.
More Information
Applications of UGR<19 Sheets
- Workplaces requiring screen-based task lighting (computer work, design studios)
- Office lighting (open-plan offices, meeting rooms)
- Schools and universities (classrooms, libraries, study halls)
- Healthcare facilities (hospitals, clinics, laboratories)
- Public buildings (airports, museums, government offices)
- Commercial lighting (retail stores, shopping malls)
- Architectural lighting (modern interior designs, co-working spaces)
- High-end residential (kitchens, study rooms, home offices)
Available Widths and Lengths
The standard sheet width is 1220 mm. For special projects, the extrusion width can be adjusted up to a maximum of 1250 mm upon request.
Our standard lengths are 1220 mm, 1830 mm, 2440 mm, and 3050 mm. Custom lengths can also be produced upon request to suit your specific needs.
Custom Cutting, Machining & Fabrication
We provide complete processing services to deliver prismatic sheets in the exact size and finish you need, from simple cuts to precision machining.
Available options include:
- Milling to create steps, grooves, or custom profiles
- CNC machining for precise shapes and patterns
- Laser cutting for smooth edges and complex geometries
- Saw cutting for standard sizing and trimming
- Bonding and assembly of multiple sheet layers
- Edge finishing with chamfers, bevels, and rounded edges
Materials: Comparison of PMMA, PC, and PS
Use this comparison table to quickly understand the differences and find the best option for your lighting project.
| Property / Feature | PMMA (Acrylic) | PC (Polycarbonate) | PS (Polystyrene) |
|---|---|---|---|
| Light Transmission | Very high | High | High |
| Impact Resistance | Low – brittle, can crack under stress | Very high – shatter-resistant | Low – brittle |
| Heat Resistance (Continuous Use) | 80–90°C | 120°C | 70°C |
| Maximum Short-Term Heat | ~100°C | ~135°C | ~80°C |
| UV Resistance / Weathering | Good (can yellow over long-term) | Moderate UV stability (However we add UV stabilizer) | Fair (Prone to yellowing)However we add UV stabilizer. |
| Flammability / Safety | Moderate (UL94 HB) | Better (UL94 V-2/V-0 with additives) | Moderate (UL94 HB) |
| Chemical Resistance | Good (resistant to mild acids/alkalis) | Excellent – resists most chemicals | Poor – sensitive to solvents |
| Weight / Density | 1.18 g/cm³ | 1.2 g/cm³ | 1.05 g/cm³ |
| Processing / Fabrication | Thermoforming, laser cutting, CNC. | Good for thermoforming, no laser cutting, CNC. | CNC. |
| Cost | Medium | High | Low |
| Durability / Lifespan | Moderate – good indoor use | Very high – suitable for harsh/industrial environments | Fair – medium-term indoor use |
| Common Applications | Office LED panels | Industrial/warehouse lighting, outdoor luminaires, impact-prone areas | Cost sensitive projects |
Product Tolerances
The three materials (PMMA, PC and PS) have similar tolerances.
| Property | Value |
| Thickness | ±3% |
| Mother board Length / Width | ±3.0 mm |
| Cut-to-Size Length / Width | ±0.3 mm |
| Light Transmittance & Haze | ±2% |
Note: PMMA has the highest thermal expansion coefficient among diffuser materials. This means it can expand in hot conditions and contract in cold conditions. Use our Thermal Expansion Calculator to predict the final dimensions before installation.
Packing
At Hexatron Technologies, we take great care in packing our diffuser sheets to ensure they reach our customers in perfect condition.
1. Standard Sheet Packing
- Mother Sheets: Large sheets (up to standard extrusion sizes) are stacked on pallets or crates.
- Final Cut / Cut-to-Size Sheets: Smaller sheets are carefully wrapped and separated with protective films or kraft paper, then bundled to avoid bending or warping.
2. Protection Methods
- Surface Protection Film: All diffuser sheets are supplied with a removable protective film to prevent scratches and contamination.
- Edge Guards / Corner Protectors: To prevent chipping or denting during handling and shipping.
3. Palletization & Securing
- Sheets are stacked on pallets or crates with interleaving layers and secured with straps or stretch film to prevent movement during transit.
- Maximum stack height is calculated based on sheet thickness and material to avoid warping or deformation. A pallet of 1.5 tons is the maximum weight.
4. Shipping & Handling Recommendations
- Flat Storage: Sheets should be stored flat and supported evenly to maintain flatness.
- Climate Considerations: Avoid prolonged exposure to extreme temperatures or humidity, especially for PMMA, to prevent dimensional changes.
- Handling: Use gloves when removing protective film to prevent fingerprints.
