Ground Joints

Ground Joints

Ground Joints are precision-conical glass connections used to securely join columns, condensers, flasks, and adapters in laboratory, pilot, and industrial setups. They provide leak-proof sealing, easy assembly, and modular flexibility for glassware systems.

Overview

• Material: Borosilicate Glass 3.3
• Taper Angle: Standard 24° or 19/26°
• Sizes: DN 5 mm to 80 mm (standard)
• Precision Ground: Ensures tight connections
• Thermal Stability: Withstands repeated heating & cooling cycles
• Chemical Resistance: Compatible with acids, bases, and solvents

Key Features & Benefits

• Leak-proof connections for distillation, extraction, and reaction setups
• Modular flexibility: Easily assemble/disassemble lab glassware
• Durable & reliable: Long-term performance under thermal and chemical stress
• Easy alignment: Reduces risk of glass chipping
• Compatibility: Fits standard adapters, stoppers, and other jointed glassware

Standard Ground Joint Sizes Table

Cat. Ref.	DN (mm)	L (mm)	Taper Angle	Type
GJ5	5	20	24°	Male
GJ10	10	25	24°	Female
GJ15	15	30	24°	Male
GJ25	25	35	24°	Female
GJ40	40	45	24°	Male
GJ50	50	50	24°	Female
GJ80	80	70	24°	Male

Applications

• Connecting distillation columns to condensers
• Joining adapters, receivers, and vessels
• Modular lab-scale assemblies
• Pilot plant or industrial setups where secure and leak-proof connections are critical

Installation Tips

• Clean joint surfaces before assembly
• Apply PTFE or glass joint grease for airtight sealing
• Align male & female joints carefully to avoid chipping
• For temporary sealing, use rubber or silicone stoppers

Advantages

• Reliable thermal & chemical resistance
• High precision for secure and tight fitting
• Modular design for easy assembly and maintenance
• Reduces risk of vapor or liquid leakage

Material & Manufacturing Specifications

• Material: Borosilicate 3.3 glass
• Surface Finish: Polished for smooth contact
• Tolerance: ±0.05 mm for tight sealing
• Temperature Range: -70°C to 250°C (continuous use)
• Pressure Resistance: Up to 5 bar (depending on diameter & wall thickness)
• Optional Coatings: PTFE or FEP coatings available for extra chemical protection

Optional Accessories

• Rubber/Silicone Stoppers: For temporary sealing of joints
• Joint Clips/Clamps: Prevent accidental separation under vibration
• PTFE Grease: Ensures smooth assembly and prevents sticking
• Custom Joint Adapters: For non-standard connections or transitions

Quality & Compliance

• ISO 9001 Certified Manufacturing
• Material Safety Data Sheets (MSDS) available
• Tested for Thermal Shock & Mechanical Stress
• Compatible with USP & ASTM chemical standards

Industries Served

• Chemical Industry: Distillation, absorption, and extraction
• Pharmaceutical Industry: Purification and separation
• Food & Beverage: Pilot-scale experiments requiring chemical resistance
• Research Labs: Modular and scalable setups
• Water Treatment Plants: Separation and absorption processes

FAQ

Q1: What is the difference between male and female ground joints?
A: Male joints are tapered externally, female joints are tapered internally. They fit together to create a leak-proof connection.

Q2: Can ground joints be used with corrosive chemicals?
A: Yes, borosilicate 3.3 glass is highly resistant to acids, bases, and most solvents.

Q3: How to prevent joints from sticking?
A: Use a thin layer of PTFE or glass joint grease. Avoid excessive heat while tightening.

Q4: Are custom sizes available?
A: Yes, non-standard diameters and tapers can be manufactured on request.