Sight glass for industrial applications

monitoringfor chemicalsinfrared thermography

Quartz glass sight glasses are sight glasses manufactured from natural or synthetic quartz (SiO₂) for use in sight glass fittings (round / longitudinal / square). They are designed for demanding applications requiring exceptional thermal, chemical and optical performance.

Key features

• High temperature resistance (service temperature up to 1000 °C)
• Excellent chemical resistance (resistant to most chemicals; attacked by hydrofluoric acid and concentrated phosphoric acid)
• High optical transmission suitable for monitoring and optical applications across UV–VIS–IR
• Suitable for liquid and gaseous media
• Custom designs and tolerances available on request

Material types

• Natural quartz glass (QZN‑F): produced by melting finely ground rock crystal in a hydrogen‑oxygen flame; characterized by superior UV transmission.
• Synthetic quartz glass / fused silica (QZS‑F): produced by flame pyrolysis of high‑purity SiCl₄; offers highest material purity, minimal inclusions and stable optical properties.

Available designs

• Plates: round, square or tongue‑shaped (oval)
• Pipes, cylinders and glass rings in various sizes and tolerances

Options / Special machining

• Step forms
• Glasses with drilled holes
• Contour cuts
• Bevels, grooves and notches

Typical applications

• Observation of high‑temperature processes (e.g. combustion chamber monitoring)
• Optical components for analytics and laser technology
• Sight glasses for liquid and gaseous media in industrial, research and R&D environments

Characteristics / Technical specifications

• Material: Quartz glass (SiO₂) — natural (QZN‑F) or synthetic / fused silica (QZS‑F)
• Maximum temperature: up to 1000 °C (application dependent)
• Chemical resistance: resistant to most chemicals; exceptions include hydrofluoric acid and concentrated phosphoric acid
• Optical: excellent transmission (natural: superior UV; synthetic: highest purity and stable UV–VIS–IR properties)
• Geometries: round, square, tongue‑shaped (oval) plates; pipes, cylinders, glass rings
• Available machining: holes, contour cuts, bevels, grooves, notches, step forms
• Intended media: liquids and gases
• Customization: bespoke designs and tolerances available on request