Durostone® UPM S16
Durostone UPM S16 is a high-pressure laminate built from a special polyester (UP) resin matrix reinforced with an E-glass roving mat, delivering 200 MPa flexural strength perpendicular to lamination and 12 kV/mm electric strength under oil at 90°C. The material is rated UL 94 V-0 at 3 mm with a Comparative Tracking Index of 600. Engineered for switchgear, electrical insulation components, power distribution equipment, and high-voltage applications.
Key Properties
- Density: 1.87 g/cm³ (ISO 1183)
- Tensile Strength ∥: 100 MPa (ISO 527)
- Flexural Strength ⊥: 200 MPa (ISO 178)
- Flammability: UL 94 V-0 / 3 mm
- Electric Strength 90°C Under Oil ⊥: 12 kV/mm (IEC 60243)
- Comparative Tracking Index: 600 (IEC 60112)
We want to help!
Enter your information and we'll get you in touch with our knowledgable staff. We know how important to the right product for your project.
Request a Consultation
- Specifications
- Applications
- General Info
- FAQs
Mechanical Properties
| Property | Value | Test Method |
| Density | 1.87 g/cm³ | ISO 1183 |
| Flexural Strength ⊥ | 200 MPa | ISO 178 |
| Modulus of Elasticity in Flexion ⊥ | 13,000 MPa | ISO 178 |
| Compressive Strength ⊥ | 300 MPa | ISO 604 |
| Compressive Strength ∥ | 180 MPa | ISO 604 |
| Tensile Strength ∥ | 100 MPa | ISO 527 |
| Impact Strength ∥ (Charpy) | 100 kJ/m² | ISO 179 |
Thermal Properties
| Property | Value | Test Method |
| Flammability | V0 / 3 mm | UL 94 |
Physical Properties
| Property | Value | Test Method |
| Water Absorption (4 mm thickness) | 0.2% | ISO 62 |
Electrical Properties
| Property | Value | Test Method |
| Electric Strength 90°C Under Oil ⊥ | 12 kV/mm | IEC 60243 |
| Electric Strength 90°C Under Oil ∥ | 75 kV/25 mm | IEC 60243 |
| Specific Surface Resistance | 10¹³ Ω | IEC 60093 |
| Comparative Tracking Index | 600 (CTI) | IEC 60112 |
Flame & Fire Performance
| Property | Value | Test Method |
| Flammability Rating | V0 at 3 mm | UL 94 |
⊥ = perpendicular to the lamination | ∥ = parallel to the lamination
Compliance
- UL 94 — Compliant (V-0 at 3 mm)
- IEC 60243, IEC 60093, IEC 60112 — Compliant (test standards)
- ISO 1183, ISO 178, ISO 604, ISO 527, ISO 179, ISO 62 — Compliant (test standards)
- Switchgear insulation panels and barriers
- Electrical insulation components
- Power distribution equipment insulation
- High-voltage application insulation laminates
- Flame-retardant structural insulation in electrical assemblies
Common industries: switchgear, electrical insulation, power distribution, and high-voltage equipment manufacturing.
Durostone UPM S16 is a high-pressure polyester glass laminate within the Durostone family of fiber-reinforced electrical insulation materials. The construction pairs a special polyester (UP) resin matrix with an E-glass roving mat to deliver elevated mechanical strength relative to standard polyester laminates, with UL 94 V-0 flame retardancy at 3 mm and CTI 600 tracking resistance for demanding switchgear and high-voltage service.
Mechanical performance includes 1.87 g/cm³ density, 200 MPa flexural strength perpendicular to lamination, 13,000 MPa modulus of elasticity in flexion, 300 MPa compressive strength perpendicular and 180 MPa parallel, 100 MPa tensile strength parallel to lamination, and 100 kJ/m² Charpy impact strength parallel to lamination. Thermally, the material is rated UL 94 V-0 at 3 mm flammability.
Dielectrically, UPM S16 provides 12 kV/mm perpendicular and 75 kV/25 mm parallel electric strength under oil at 90°C, 10¹³ Ω specific surface resistance, and a Comparative Tracking Index of 600. Water absorption at 4 mm thickness is 0.2%.
Compliant with UL 94 V-0 at 3 mm, ISO 1183, ISO 178, ISO 604, ISO 527, ISO 179, ISO 62, IEC 60243, IEC 60093, and IEC 60112.
What differentiates Durostone UPM S16 from UPM 203 or other polyester glass laminates?
UPM S16 is a high-pressure laminate construction, delivering higher mechanical performance than standard polyester glass mat laminates — 200 MPa flexural strength perpendicular, 100 MPa tensile parallel, and 100 kJ/m² Charpy impact, versus 130 MPa, 70 MPa, and 40 kJ/m² for UPM 203. It pairs that elevated structural performance with UL 94 V-0 flame retardancy and CTI 600 tracking resistance, positioning it for switchgear and power distribution components that need both strength and dielectric performance.
Why does Comparative Tracking Index matter for this material?
CTI measures a material's resistance to surface conductive paths forming under wet or contaminated electrified conditions. UPM S16 is rated CTI 600 per IEC 60112, the top performance band, which is why it is specified for switchgear and high-voltage insulation where surface tracking is a primary failure mode. The high CTI is paired with 12 kV/mm dielectric strength perpendicular and 75 kV/25 mm parallel under oil at 90°C.
What is the operating temperature for UPM S16?
The TDS lists UL 94 V-0 at 3 mm flammability under thermal properties; no Temperature Index or Insulation Class is specified on the manufacturer's TDS for this material.
Is UPM S16 suitable for switchgear and flame-rated electrical environments?
Yes. UPM S16 is rated UL 94 V-0 at 3 mm with CTI 600 and 12 kV/mm dielectric strength perpendicular under oil at 90°C, making it suitable for switchgear, power distribution equipment, and high-voltage application insulation.
How should UPM S16 be specified?
Specify grade (Durostone UPM S16), thickness, sheet dimensions, flame rating (UL 94 V-0 at 3 mm), CTI class, dielectric performance requirements, mechanical loading direction (perpendicular or parallel), dimensional tolerances, and finished format.
