Filter Papers & Thimbles

Qualitative Filter Papers
• 100% alpha cotton cellulose
• pH tolerant 0 to 12
• Temperature maximum 120°C
• Wide selection – seven types
• Ash Content: 0.1%
APPLICATIONS
• Clarify and remove precipitates
• Preparation for qualitative analysis
Quantitative Filter Papers
• Highest quality alpha cotton cellulose
• Ash Content: 0.01%
• Acid washed: Double acid washed in hydrochloric then hydrofluoric acid then rinsed with ultrapure water to neutralize. No.50 is further treated with nitric acid before washing
APPLICATIONS
• Gravimetric analysis
• Environmental monitoring
Pure Nitrocellulose for Blotting and Hybridization
• Pure esters of nitrocellulose, free of acetate and other esters
• Maximal protein/nucleic acid binding, up to 80-100 μg/cm2
• Low background
• Two pore sizes available: 0.45 μm is suitable for most blotting applications, 0.20 μm sizes for lower molecular weights
Extraction Thimbles
High purity, seamless filters with a characteristic thimble shape.
Applications include analysis of fats, oils, grease, pesticides, pollutants, other organics and additives in plastics and rubber materials.
Cellulose Thimbles
• Suitable for Soxhlet extractions of organic components
• Dust sampling
• Lipid content max. 0.1% by weightGlass Fiber Thimbles
• Borosilicate glass
• High temperature extractions or dust monitoring (²500°C)
• Acid resistant (except hydrofluoric)
• Acid washed for minimum trace metal content
Silica Fiber Thimbles
• Use up to 1000°C
• treated at 900°C for 4 hours to stabilize the weight prior to use
• are tapered for ease in loading into stack samplers
PTFE Fiber and PTFE/Silica Fiber Thimbles
• Durable, temperature-resistant
• Non-adsorptive with respect to acid gases
• PTFE is inherently hydrophobic
• Little or no trace metal contamination