Glass to Other Materials PTFE Vacuum Bellows

Glass to Other Materials PTFE Vacuum Bellows

Glass to Other Materials PTFE Vacuum Bellows are flexible, vacuum-rated connectors used to join glass components with non-glass equipment such as stainless steel, carbon steel, glass-lined steel, PTFE-lined piping, or alloy flanges. These bellows are designed to isolate fragile glass assemblies from the mechanical stresses generated by rigid metallic systems while maintaining leak-tight vacuum integrity.

They play a critical role in vacuum process systems where differential thermal expansion, vibration, and alignment mismatch exist between glass and metal components.

Vacuum-Duty Engineering Design

Under vacuum conditions, external atmospheric pressure acts to compress the bellows. To withstand this, these bellows are engineered with:

• Vacuum-stable convolution geometry
• Uniform PTFE wall thickness
• Controlled flexibility without collapse
• Optional internal vacuum support sleeves for larger diameters
• Distance locking bolts to limit axial travel

This design ensures structural stability and dimensional control throughout prolonged vacuum operation.

Material Construction

• Bellows Body: High-purity PTFE
• Key Properties:
• Chemically inert
• Non-aging
• Low gas permeability
• Non-contaminating surface

Flange Interfaces:

• PTFE flanges
• Metallic adaptor flanges (SS / CI / Aluminium)
• Cast iron or stainless steel adaptor bellows flanges as required

Functional & Mechanical Features

• Full Vacuum Compatibility
  Designed for sustained vacuum service without deformation
• Glass Protection
  Prevents stress transmission from metal equipment to glass joints
• Thermal Expansion Compensation
  Absorbs differential expansion between glass and metal sections
• Vibration Isolation
  Decouples vibration from pumps, agitators, and rotating equipment
• Misalignment Accommodation
  Allows limited axial, angular, and lateral misalignment

Connection Configuration

Glass Side:

• Glass flange connection
• No gasket required in many designs due to PTFE sealing surface

Other Material Side:

• Stainless steel flange
• Glass-lined steel flange
• Carbon steel flange
• PTFE-lined flange
• Adaptor backing or bellows flange (as required)

Flange Drilling Options:

• Table E
• Table F
• ASA / ANSI 150
• Customer-specified patterns

Technical Data – Typical

Parameter	Specification
Bellows Material	PTFE
Application	Vacuum Service
Vacuum Rating	Suitable for full vacuum
Pressure Rating	Low to moderate (design dependent)
Temperature Range	As per PTFE operating limits
Nominal Sizes	DN 25 to DN 300
Movement Capability	Axial & angular
Sealing Method	Integral PTFE bellows sealing
Internal Vacuum Support	Optional (recommended for DN ≥ 80)
Adaptor Flange Materials	CI / SS / Aluminium

Typical Applications

• Glass reactors connected to metal vacuum lines
• Vacuum distillation and evaporation systems
• Condensers connected to metallic vacuum manifolds
• Glass receivers connected to metal pumps
• Chemical and pharmaceutical vacuum processes
• Pilot plants and R&D vacuum setups

Industries Served

• Chemical Processing
• Pharmaceutical & API Manufacturing
• Research & Pilot Plants
• Fine & Specialty Chemicals
• Glass-lined Equipment Systems

Customization Options

• Custom DN sizes and effective lengths
• Internal vacuum support sleeves
• Adaptor flange material selection
• Custom flange drilling standards
• Application-specific movement limits

Why Use Glass to Other Materials PTFE Vacuum Bellows?

• Ensures safe glass-to-metal integration
• Maintains vacuum integrity
• Absorbs mechanical and thermal stresses
• Reduces risk of glass failure
• Essential component in mixed-material vacuum systems