Technical Details of MEMpax®
A unique range of exceptional properties make MEMpax® a go-to product for a broad range of applications. Durability in processing, suitability for high-temperature bonding, a wide array of sizes, and its availability in unrivalled low thickness ranges make MEMpax® truly stand out.
High durability in extremely low thicknesses
Material properties
1. Optical properties
| Optical Properties | Value |
|---|---|
| Refractive index* ng | 1.4803 |
| Refractive index* nF' | 1.4768 |
| Refractive index* nF | 1.4765 |
| Refractive index* ne | 1.4732 |
| Refractive index* nd | 1.4715 |
| Refractive index* nD | 1.4714 |
| Refractive index* nC' | 1.4696 |
| Refractive index* nC | 1.4693 |
| Abbe value νe | 65.4 |
| Photoelastic constant in (nm/cm)/Mpa | 39.8 |
* Refractive indices: Pretreatment of samples.
Condition as supplied ["as drawn"]
2. Thermal properties
| General thermal properties | Unit | Value |
|---|---|---|
| CTE (Coefficient of thermal expansion) α | 10-6·K-1 (20 °C; 300 °C) | 3.26 |
| Mean specific heat capacity cp | in J/(g·K)(20 °C; 100 °C) | 0.82 |
| Transformation temperature Tg | in °C | 532 |
| Viscosities | Viscosity lg ŋ in dPas | Temperature in °C |
|---|---|---|
| Strain point | 14.5 | 528 |
| Annealing point | 13.0 | 570 |
| Softening point | 7.6 | 831 |
3. Mechanical properties
| Mechanical Properties |
Unit | Value |
|---|---|---|
| Density ρ | in g/cm³ | 2.22 |
| Young's modulus E | in kN/mm² | 62.7 |
| Poisson's ratio µ | 0.196 | |
| Torsion modulus G | in kN/mm² | 26.2 |
| Knoop hardness | HK 0.1/20 | 430 |
| Vickers hardness | HV 0.2/25 | 510 |
Chemical toughening (for thickness = 0.2 mm)
| Unit |
Value |
|---|---|
| Temperature ϑ in °C | 430 |
| Time t in h | 4 |
| Compressive stress (CS) in MPa | 120 |
| Depth of layer (DoL) in µm | 8 |
4. Chemical properties
| Hydrolytic resistance (acc. to DIN ISO 719) | Value |
|---|---|
| Class | HGB 1 |
| Equivalent of alkali per gram glass grains in µg/g | < 31 |
| Acid resistance (acc. to DIN 12116) | Value |
|---|---|
| Class | S 1 |
| Half surface weight loss after 6 hours in mg/dm² | 0.16 |
| Alkali resistance (acc. to DIN ISO 695) | Value |
|---|---|
| Class | A 2 |
| Surface weight loss after 3 hours in mg/dm² | 132 |
5. Electrical properties
| Dielectric constant εr (at ϑ = 25 °C) | Value |
|---|---|
| at 1 MHz | 4.8 |
| at 1 GHz | 4.4 |
| at 2 GHz | 4.5 |
| at 5 GHz | 4.4 |
| at 24 GHz | 4.4 |
| at 77 GHz | 4.4 |
| Dissipation factor tan δ (at ϑ = 25 °C) |
Value |
|---|---|
| at 1 MHz | 38 · 10-4 |
| at 1 GHz | 58 · 10-4 |
| at 2 GHz | 62 · 10-4 |
| at 5 GHz | 73 · 10-4 |
| at 24 GHz | 100 · 10-4 |
| at 77 GHz | 150 · 10-4 |
| Electric volume resistivity ρD in Ω·cm direct current |
|---|
| 1.18 ·108 ( ϑ = 250 °C) |
| 4.24 ·106 (ϑ = 350 °C) |
6. Transmittance values
Spectral transmittance (250 - 3150 nm)
Spectral transmittance (250 - 500 nm)
| Wavelength in nm at thickness 0.2 mm: | τ (λ) in % |
|---|---|
| 254 | 28 |
| 380 | 92.4 |
| 632.8 | 92.8 |
| 1064 | 92.7 |
| Edge wavelength λc (τ = 0.46) at thickness in mm | Wavelength in nm |
|---|---|
| 0.2 | 269 |
| 0.3 | 279 |
| 0.5 | 283 |
| 0.7 | 288 |
| Luminous transmittance at thickness in mm | τvD65in % |
|---|---|
| 0.2 | 92.8 |
| 0.5 | 92.8 |
MEMpax® products
SCHOTT MEMpax® is available as:
- Unpolished substrates and wafers
- FLEXINITY®
To find out more, please see the related products on the overview page.
