Durostone® WGR 781
Durostone WGR 781 is a fibre-reinforced composite developed for wave soldering service, with a maximum continuous operating temperature of 280°C and ESD-controlled surface resistivity of 10⁵ – 10⁸ Ω/sq. The material delivers 400 MPa flexural strength perpendicular to lamination (300 MPa retained at +150°C), 26,000 MPa modulus of elasticity in flexion, water absorption below 0.1%, and a sanded surface finish. Engineered for electronics manufacturing fixtures, PCB processing equipment, and solder pallets.
Key Properties
- Density: 1.85 g/cm³ (ISO 1183)
- Flexural Strength ⊥: 400 MPa (ISO 178)
- Modulus of Elasticity in Flexion ⊥: 26,000 MPa (ISO 178)
- Max. Continuous Operating Temperature: 280°C
- Surface Resistivity: 10⁵ – 10⁸ Ω/sq (ASTM D257)
- Water Absorption: < 0.1% (ISO 62)
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- Specifications
- Applications
- General Info
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Mechanical Properties
| Property | Value | Test Method |
| Density | 1.85 g/cm³ | ISO 1183 |
| Flexural Strength ⊥ | 400 MPa | ISO 178 |
| Flexural Strength ⊥ +150°C | 300 MPa | ISO 178 |
| Modulus of Elasticity in Flexion ⊥ | 26,000 MPa | ISO 178 |
| Modulus of Elasticity in Flexion ⊥ +150°C | 24,000 MPa | ISO 178 |
Thermal Properties
| Property | Value | Test Method |
| Thermal Conductivity | 0.3 W/m·K | DIN 52612 |
| Max. Continuous Operating Temperature | 280°C | — |
Physical Properties
| Property | Value | Test Method |
| Water Absorption (Method 1) | < 0.1% | ISO 62 |
ESD / Electrical Properties
| Property | Value | Test Method |
| Surface Resistivity | 10⁵ – 10⁸ Ω/sq | ASTM D257 |
Availability / Supply Form
| Property | Value | Test Method |
| Standard Sheet Size | 2500 × 1220 mm | — |
| Standard Thickness — 6 mm | -0/+0.2 mm | — |
| Standard Thickness — 8 mm | -0/+0.2 mm | — |
| Standard Thickness — 10 mm | -0/+0.2 mm | — |
| Custom Thicknesses | Available on request | — |
| Surface Finish | Sanded | — |
⊥ = perpendicular to the lamination | ∥ = parallel to the lamination
Compliance
- ISO 1183, ISO 178, ISO 62 — Compliant (test standards)
- DIN 52612 — Compliant (thermal conductivity test method)
- ASTM D257 — Compliant (surface resistivity test method)
- Wave soldering pallets and carriers
- PCB processing fixtures
- Solder pallet base plates
- Wave soldering equipment fixturing
- Electronics manufacturing tooling subjected to elevated temperature
Common industries: electronics, PCB manufacturing, and wave soldering equipment.
Durostone WGR 781 is a fibre-reinforced composite within the Durostone family, developed specifically for wave soldering applications in electronics manufacturing. The material is engineered to withstand a maximum continuous operating temperature of 280°C while delivering controlled ESD surface resistivity, making it suited to the manufacture of solder pallets, PCB processing fixtures, and wave soldering equipment.
Mechanical performance includes 1.85 g/cm³ density, 400 MPa flexural strength perpendicular to lamination (300 MPa retained at +150°C), and 26,000 MPa modulus of elasticity in flexion (24,000 MPa at +150°C). Thermally, the material is rated for a maximum continuous operating temperature of 280°C with thermal conductivity of 0.3 W/m·K.
ESD performance is documented as 10⁵ – 10⁸ Ω/sq surface resistivity per ASTM D257, in the static-dissipative range. Water absorption (Method 1) is below 0.1%. WGR 781 is supplied in a standard sheet size of 2500 × 1220 mm with a sanded surface finish, in standard thicknesses of 6, 8, and 10 mm with a -0/+0.2 mm tolerance; other thicknesses are available on request.
Compliant with the listed test standards: ISO 1183, ISO 178, ISO 62, DIN 52612, and ASTM D257.
What differentiates Durostone WGR 781 from general-purpose glass laminates?
WGR 781 is purpose-built for wave soldering service. The defining differentiators are a 280°C maximum continuous operating temperature — well above standard FR-4 or general-purpose epoxy laminates — and a controlled ESD surface resistivity of 10⁵ – 10⁸ Ω/sq for static-dissipative behavior in electronics manufacturing. Combined with retained mechanical performance at +150°C (300 MPa flexural, 24,000 MPa modulus), this profile fits solder pallet and PCB fixture applications that other laminates cannot tolerate.
Why does the maximum continuous operating temperature matter for this material?
Wave soldering exposes pallets and fixtures to repeated thermal cycling near molten solder temperatures. A laminate that softens, delaminates, or off-gasses under that load fails quickly. WGR 781 is rated for 280°C continuous service and retains 75% of its room-temperature flexural strength (300 MPa of 400 MPa) at +150°C, which is what makes the material specifiable for production solder pallets rather than one-off use.
What is the maximum operating temperature for WGR 781?
The maximum continuous operating temperature is 280°C.
Is WGR 781 suitable for ESD-controlled electronics manufacturing environments?
Yes. The material is documented at 10⁵ – 10⁸ Ω/sq surface resistivity per ASTM D257, placing it in the static-dissipative range appropriate for electronics manufacturing fixtures, wave soldering pallets, and PCB processing tooling.
How should WGR 781 be specified?
Specify grade (Durostone WGR 781), thickness (6, 8, 10 mm, or custom), sheet dimensions (standard 2500 × 1220 mm), surface finish (sanded), thermal performance requirements (max continuous operating temperature), ESD surface resistivity requirements, dimensional tolerances, and finished format.
