Stoppers and Adaptors

Stoppers and Adaptors

Stoppers and Adaptors are essential components for laboratory and industrial glassware systems, used to seal vessels, connect glassware sections, and facilitate modular setups. They ensure leak-proof operation, chemical resistance, and easy handling in distillation, reaction, and separation processes.

Overview

• Material: Borosilicate Glass 3.3 / PTFE / Rubber
• Sizes: DN 5 mm to DN 80 mm (standard)
• Types: Solid stoppers, hollow stoppers, adaptor stoppers
• Temperature Range: -70°C to 250°C (glass), up to 150°C (rubber/PTFE)
• Pressure Resistance: Up to 5 bar (depending on size and type)
• Chemical Compatibility: Resistant to acids, bases, and most solvents

Key Features & Benefits

• Leak-proof sealing for flasks, vessels, and reactors
• Modular flexibility: Compatible with ground joints, columns, and adapters
• Durable & chemical-resistant: Long-lasting performance under harsh conditions
• Multiple material options: Glass, PTFE, Rubber for various applications
• Easy installation & removal: Prevents chipping or damage to glassware

Types of Stoppers & Adaptors

Type	Material	Application	Features
Solid Stopper	Borosilicate Glass	Sealing flasks, tubes	Heat & chemical resistant, precision fit
Hollow Stopper	Borosilicate Glass / PTFE	For inserting tubes or thermometers	Allows insertion of probes, tubing, or sensors
Rubber Stopper	Natural / Silicone	Temporary sealing	Flexible, chemical-resistant, easy removal
PTFE Stopper	PTFE	Chemical-resistant sealing	Excellent for corrosive chemicals, high temperature tolerance
Adaptor Stopper	Glass / PTFE	Transition between vessels/joints	Converts DN sizes, allows insertion of tubing or sensors

Applications

• Sealing reaction flasks, distillation receivers, and separation funnels
• Connecting ground joint adapters or tubing
• Inserting thermometers, probes, or gas inlets through hollow stoppers
• Temporary sealing for pilot plant or laboratory-scale systems
• Ensuring vapour-tight operation in chemical, pharmaceutical, and petrochemical labs

Technical Specifications

Cat. Ref	Type	DN (mm)	L (mm)	Material	Max Temp °C	Notes
STG5	Solid	5	15	Glass	250	Lab-scale
STG10	Solid	10	20	Glass	250	Standard
STG20	Hollow	20	30	Glass/PTFE	250	Thermometer / probe insertion
STR25	Rubber	25	35	Silicone	150	Flexible
STP40	PTFE	40	45	PTFE	200	Corrosive chemicals
STA50	Adaptor Stopper	50	50	Glass/PTFE	250	DN transition
STA80	Adaptor Stopper	80	70	Glass/PTFE	250	Large-scale vessels

Advantages

• Provides tight and reliable sealing
• Supports modular lab and pilot plant setups
• Compatible with ground joints, adapters, and column systems
• Available in custom sizes for specific applications
• Resistant to chemical corrosion, high temperatures, and mechanical stress

Installation Tips

• Ensure surfaces of stoppers and glassware are clean & dry
• Apply PTFE or glass joint grease for airtight sealing (if needed)
• Avoid excessive force when inserting stoppers to prevent chipping
• Hollow stoppers: Insert probes, tubing, or thermometers carefully

Industries Served

• Chemical & Petrochemical: Reaction vessels, distillation setups
• Pharmaceutical: Purification, separation, pilot-scale reactions
• Food & Beverage Labs: Safe handling of chemical reagents
• Research & Development Labs: Modular glassware assemblies
• Environmental & Water Treatment Labs: Sealing vessels for liquid/gas separation

Optional Accessories

• Joint Clips/Clamps: Secure stoppers under vibration or thermal cycling
• Thermometer Adapters: For hollow stopper integration
• PTFE Grease: For smooth assembly
• Custom Adaptor Stoppers: To convert non-standard DN sizes

Compliance & Quality

• Manufactured from high-quality borosilicate glass 3.3, PTFE, and silicone
• ISO 9001 Certified production
• Thermal shock tested
• Compatible with USP, ASTM, and laboratory chemical standards
• Supplied with MSDS and quality certifications