Optical Instruments: Outgassing Prevention in High-Precision Lens Housing
Problem Statement
High-precision lens housings require materials that prevent outgassing under vacuum conditions. Outgassing leads to contamination, fogging, and reduced optical clarity. Traditional elastomers like NBR degrade at elevated temperatures, releasing volatile organic compounds (VOCs).
Material Science Analysis
Outgassing occurs due to low molecular weight additives and polymer chain breakdown. FKM (Fluorocarbon Rubber) excels due to its high fluorine content (66-70%), which provides thermal stability and chemical resistance. FKM minimizes VOC release, ensuring optical clarity in vacuum environments.
Technical Specs
- Material: FKM (Grade: Viton® GLT)
- Shore A Hardness: 75 ± 5
- Tensile Strength: 18 MPa
- Elongation at Break: 200%
- Temperature Range: -20°C to 200°C
- Compression Set: 15% (22 hrs @ 200°C)
Material Comparison
| Parameter | FKM (Viton® GLT) | EPDM | Silicone |
|---|---|---|---|
| Outgassing (μg/cm²) | ≤ 0.1 | ≥ 1.5 | ≥ 0.5 |
| Temperature Range (°C) | -20 to 200 | -50 to 150 | -60 to 230 |
| Compression Set (%) | 15 | 25 | 20 |
| Chemical Resistance | Excellent | Good | Fair |
Standard Compliance
RubberQ adheres to IATF 16949 standards for batch-to-batch consistency. Materials comply with ASTM D2000 for elastomer classification and ISO 3601 for sealing performance. Our in-house compounding ensures precise control over polymer ratios and curing agents.
For custom material compound development or IATF 16949 documentation, consult RubberQ’s engineering department.
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