CRUCIBLE SLEEVES

GISCOM Crucible Sleeves are high-quality silicone and natural rubber adapters designed to create a clean, secure, and airtight seal between funnels, crucibles, vacuum filters, and filtering flasks. They ensure stable positioning, prevent leaks, and improve the efficiency of filtration and vacuum operations. Their durability and chemical resistance make them essential accessories in laboratories handling routine or high-precision filtration tasks.

Key Features

• Provides a firm, airtight seal between glassware components
• Flexible, durable construction suitable for repeated laboratory use
• Excellent grip and stability during filtration or vacuum applications
• Resistant to common laboratory chemicals and temperature variations
• Multipurpose design compatible with funnels, crucibles, and vacuum filter systems
• Smooth inner and outer surfaces for easy installation and removal

Material Specifications

• Materials: High-grade silicone rubber & natural rubber
• Properties: High elasticity and tear resistance, chemical resistance to acids, alkalis, and aqueous solutions. Non-toxic and non-reactive with standard lab reagents. The silicone variant provides enhanced heat resistance
• Thermal Range: Silicone generally up to 200–220°C Natural Rubber: suitable up to ~70–80°C
• Manufacturing Standards: Produced under ISO-compliant quality and safety processes

Technical Specifications

• Available Sizes: Multiple tapered sizes to fit standard laboratory flasks and funnels
• Design: Concentric, stepped profile to accommodate various diameters
• Fit Accuracy: Precision-molded for consistent sealing without slippage
• Color: Typically supplied in blue or standard rubber tones
• Accessories: Delivered as individual sleeves or assorted-size sets (depending on order)

Handling & Precautions

• Install using gentle pressure; avoid forcing into delicate glassware
• Clean with mild laboratory detergent—avoid strong solvents harmful to rubber
• Silicone variants are autoclavable; natural rubber versions are not recommended for autoclaving
• Do not expose natural rubber sleeves to oils or high temperatures
• Store in a cool, dry place away from direct sunlight to maintain elasticity and lifespan

Applications

• Creating secure seals during vacuum filtration, gravity filtration, or liquid transfer
• Suitable for chemistry, biology, environmental science, and analytical labs
• Widely used in pharmaceutical manufacturing, QC/QA labs, research institutes, and academic laboratories
• Ideal for processes requiring stable support between funnels, crucibles, and flasks