Whatman Filter Papers – Qualitative & Quantitative Lab Grade

Whatman Filter Papers – Qualitative & Quantitative Lab Grade

Introduction

Across scientific research laboratories, educational institutions, pharmaceutical plants, and environmental testing units in Bangladesh, analytical precision depends heavily on reliable sample preparation. When filtering precipitates, clarifying liquid solutions, or conducting gravimetric analysis, standard filters often fail due to fiber shedding or inconsistent pore sizes. This is where Whatman Filter Papers set the global benchmark. Recognized worldwide for exceptional purity, consistent retention, and high batch-to-batch uniformity, Whatman Filter Papers are the preferred choice for chemists and laboratory technicians in Dhaka and beyond. Whether you are running routine water quality tests or complex chemical assays, using authentic Whatman Filter Papers ensures accuracy and reproducible results.

Detailed Overview & Technical Specifications

Manufactured from high-grade cotton linters containing an extremely high percentage of alpha-cellulose, Whatman Filter Papers are engineered to meet strict international laboratory standards. They are broadly categorized into qualitative, quantitative, and phase-separator grades to address diverse filtration needs.

• Product Type: Laboratory Filter Papers (Circular & Sheets)

• Material Composition: $>98\%$ Alpha-Cellulose Cotton Linters

• Common Qualitative Grades: Grade 1 (Standard filtration, 11 $\mu m$), Grade 4 (Fast filtration, 20 to 25 $\mu m$)

• Common Quantitative Grades: Grade 40 (Ashless, general analytical), Grade 41 (Fast ashless for coarse precipitates, 20 to 25 $\mu m$)

• Ash Content: Extremely low (e.g., $<0.007\%$ for ashless quantitative grades)

• Packaging: Typically packs of 100 circles (Diameters: 90mm, 110mm, 125mm, 150mm, etc.)

• Country of Origin: UK / USA (Global Cytiva / Whatman manufacturing standards)

Why Choose Whatman Filter Papers for Your Laboratory?

আমাদের দেশের কেমিক্যাল ল্যাবরেটরি, রিসার্চ সেন্টার এবং কোয়ালিটি কন্ট্রোল বিভাগে সঠিক ফিল্ট্রেশন বা পরিশ্রাবণ নিশ্চিত করা অত্যন্ত জরুরি। স্যাম্পল প্রিপারেশনের সময় একটু ভুলের কারণে পুরো অ্যানালাইসিস নষ্ট হতে পারে। এই সমস্যা এড়াতে Whatman Filter Papers এর কার্যকারিতা তুলনাহীন।

1. Unmatched Purity: The high alpha-cellulose content prevents sample contamination, ensuring that organic or inorganic residues are not affected by filter extractables.

2. Consistent Pore Size Distribution: Every circle of Whatman Filter Papers is manufactured under strict quality controls to guarantee precise particle retention ratings, ranging from fast-flowing coarse filters to slow-flowing fine filters.

3. High Wet Strength: Specially treated grades offer exceptional wet strength, allowing them to withstand vacuum filtration or heavy aqueous solutions without tearing.

4. Ashless Options Available: For quantitative gravimetric analysis, ashless quantitative Whatman Filter Papers leave virtually zero residue upon ignition, ensuring exact weight calculations.

Application Fields in Bangladesh

বাংলাদেশের বিভিন্ন প্রতিষ্ঠান ও শিল্পে এই ফিল্টার পেপারগুলো ব্যাপকভাবে ব্যবহৃত হয়:

• Pharmaceutical & Chemical Labs: Clarifying solutions, removing fine crystals, and performing raw material quality testing.

• Environmental & Water Testing: Monitoring total suspended solids (TSS) in drinking water, effluent treatment plant (ETP) discharges, and river water samples.

• Food & Beverage Quality Control: Analyzing sugar content, fat separation, and beverage clarity in industrial food labs.

• Educational Institutions: Demonstrating fundamental filtration, gravity separation, and chemistry principles in university and college science labs.

Frequently Asked Questions (FAQ)

• Q1: What is the difference between qualitative and quantitative Whatman Filter Papers?

  • A: Qualitative grades (like Grade 1) are used for routine filtration and qualitative analysis, leaving a higher ash content after ignition. Quantitative grades (like Grade 40 and Grade 41) are acid-washed, ashless filters designed specifically for gravimetric weight analysis.

• Q2: Which Whatman grade should I use for fast filtration of coarse particles?

  • A: Grade 4 (qualitative) or Grade 41 (quantitative) features a larger pore size (approx. 20 to 25 micrometers), making them ideal for rapid gravity filtration of gelatinous or coarse precipitates.

• Q3: Are these filter papers genuine Whatman products available in Bangladesh?

  • A: Yes, certified scientific equipment distributors in Bangladesh supply original Cytiva/Whatman packs complete with manufacturer labeling and lot numbers.

• Q4: What is the price range of Whatman Filter Papers in Bangladesh?

  • A: Depending on the grade type (qualitative vs. quantitative) and diameter size (e.g., 110mm vs 150mm per 100 circles), packs generally range from 1,800 BDT to 5,500 BDT.