Rubber Inserts

Rubber Inserts

Rubber Inserts are elastomer-based sealing and cushioning components used in glass coupling assemblies, flange joints, and flexible connection systems. They act as intermediate elements between rigid components, providing shock absorption, vibration damping, sealing assistance, and stress reduction in glass process installations.

These inserts are particularly valuable where minor misalignment, mechanical vibration, or impact loads could otherwise transmit stress to fragile glass components.

Functional Role in Glassware Assemblies

Rubber inserts are positioned within couplings, backing flanges, adaptor assemblies, and bellows interfaces to:

• Absorb mechanical shock and vibration
  
• Reduce direct metal-to-glass contact
  
• Improve sealing conformity
  
• Compensate minor dimensional tolerances
  
• Protect glass edges from stress concentration

Design & Construction Features

• Precisely moulded elastomer profiles
• Smooth contact surfaces to avoid glass damage
• Uniform hardness for consistent compression
• Designed for easy placement and replacement
• Compatible with modular glass systems

Material Options

Rubber inserts are available in different elastomer grades depending on process media, temperature, and operating conditions:

• Natural Rubber (NR) – general purpose cushioning
• EPDM Rubber – good chemical and weather resistance
• Nitrile (NBR) – suitable for oils and hydrocarbons
• Silicone Rubber – high-temperature flexibility
• Viton / FKM – for aggressive chemical environments (on request)

Thermal & Mechanical Performance

• Maintains elasticity over a wide temperature range
• Provides controlled compression under bolt tightening
• Reduces stress from thermal expansion mismatches
• Helps dampen vibration from rotating equipment

Sealing & Safety Benefits

• Although not primary pressure seals, rubber inserts:
• Improve contact uniformity between mating components
• Assist in secondary sealing performance
• Minimize chipping or cracking of glass edges
• Increase system tolerance to handling errors

Dimensional & System Compatibility

• Available across multiple DN sizes
• Designed to match standard coupling geometries
• Compatible with:
• Complete couplings
• Quick release couplings
• Backing flanges
• Bellows flange assemblies

Technical Data (Typical)

Parameter	Specification
Product Type	Rubber Inserts
Material Options	NR / EPDM / NBR / Silicone / FKM
Hardness Range	Typically 50–70 Shore A
Nominal Sizes	DN 25 – DN 300
Function	Cushioning, vibration damping, stress relief
Temperature Range	As per elastomer grade
Chemical Resistance	Material-dependent
Pressure Role	Auxiliary (non-primary seal)
Installation	Manual insertion during coupling assembly
Customization	Size, profile, material

Typical Applications

• Glass-to-glass coupling assemblies
• Glass-to-metal transitions
• Vibration-prone pipeline sections
• Modular laboratory glassware
• Pilot plant process systems
• Installations requiring shock protection

Industries Served

• Chemical Processing
• Pharmaceutical
• Research & Development
• Specialty Chemicals
• Pilot & Demonstration Plants

Customization & Engineering Support

• Elastomer selection based on media compatibility
• DN-specific insert profiles
• Temperature-optimized compounds
• Retrofit compatibility with existing couplings

Key Advantages

• Protects fragile glass components
  
• Improves system longevity
  
• Reduces vibration transmission
  
• Enhances operational safety
  
• Easy replacement and maintenance