Filter Paper Qualitative No.131

Filter Paper Qualitative No.131:

High retention efficiency for fine crystalline precipitates such as barium sulphate; characterised by a slow flow rate, a smooth surface, and normal hardness.

Qualitative Filter Papers:

Premium qualitative filter paper crafted from 100% cotton linter cellulose. Exhibits exceptional pH tolerance (0-12) and thermal stability (up to 120°C) with minimal ash content (0.1%). Ideal for precise precipitate removal and clarification procedures in laboratory settings. Specifically designed for preparation stages in qualitative analytical workflows.

Note:

• Filter paper Qualitative No.131 is characterized by three key performance metrics: flow time (seconds needed for 100 mL distilled water at 20°C to filter through a 10 cm² section under 10cm water column pressure), absorption speed (distance water travels up a vertical strip in 10 minutes at 20°C), and wet strength (pressure resistance measured via Mullen Burst Strength Tester after water immersion).

• Type	Pore Size Range	Typical Use	Effect on Liquid Clarity	Flow Speed
  Qualitative (e.g., Grade 1)	8–11 μm	Routine lab filtration, removing larger sediments	Good for basic clarity (traps visible particles like sand or grounds)	Fast
  Quantitative (e.g., Grade 5 or finer ash-free)	2.5–3.5 μm	Analytical work, gravimetric analysis	Best for high clarity (traps very fine particles, ideal for purifying solutions or beverages like wine)	Medium to slow
  Glass Microfiber	0.7–2.7 μm	High-temperature or chemical-resistant filtration	Excellent for ultra-clear results in specialised cases (e.g., air pollution analysis), but less common for liquids	Fast (but requires flat use, not folding)
  Specialty (e.g., Wine Filtration)	7–10 μm	Food/beverage clarification	High clarity for consumables, retaining fine sediments while preserving taste	Medium