Description

Whatman Grade 42 Filter Paper 12.5 cm – Technical Overview

The Whatman Grade 42 Filter Paper 12.5 cm is a world-class standard for critical gravimetric analysis. Manufactured by Cytiva (formerly GE Healthcare), this quantitative filter paper is designed for the finest particulate filtration. With a nominal pore size of 2.5 microns, Grade 42 is the most common choice for capturing small particles in analytical chemistry.

As an ashless filter paper, it undergoes an acid-washing process to reduce ash content to less than 0.007%. This ensures that during the ignition or combustion phase of a laboratory experiment, the filter medium does not interfere with the final weight of the precipitate. Professionals across Bangladesh rely on the Whatman 1442-125 for its consistency and high purity.

Whatman 1442-125 Specifications and Material Composition

The Whatman 1442-125 model comes in a pack of 100 circles with a diameter of 12.5 cm (125mm). It is composed of high-quality cotton linters. The material is treated to ensure high alpha-cellulose content. This provides the chemical resistance and structural integrity needed for complex filtration tasks involving aggressive acids or alkalis.

The slow flow rate of Grade 42 makes it ideal for collecting very fine precipitates. In laboratory settings where precision is non-negotiable, using a genuine Whatman quantitative filter paper Grade 42 ensures that your results are reproducible and accurate.

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Filter Papers Grade-42 Whatman 12.5 cm Applications in Laboratory Testing

The utility of Whatman Grade 42 Ashless Filter Paper extends across various scientific disciplines. Because it can retain extremely fine crystalline precipitates, it is the primary choice for gravimetric analysis. In Bangladesh, quality control laboratories in the pharmaceutical and food industries frequently utilize this specific grade for mineral analysis.

Gravimetric Analysis for Barium Sulfate and Calcium Carbonate

One of the most frequent uses for the Whatman 42 filter paper is for barium sulfate precipitation. Because barium sulfate particles are exceptionally small, standard filter papers often fail to capture them, leading to inaccurate results. Grade 42 provides the necessary retention density. Similarly, it is used for calcium carbonate analysis and the filtration of finely divided precipitates like metastannic acid.

Industrial and Environmental Quality Control

Beyond pure chemistry, this 2.5 micron ashless filter paper 12.5 cm is vital for environmental monitoring. It is used to filter samples for the determination of trace elements. In the agricultural sector of Bangladesh, soil testing labs use Whatman 12.5 cm ashless circles to ensure that the mineral content of soil samples is measured without contamination from the filter medium itself.

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Difference Between Whatman Grade 40 41 and 42

Choosing the right quantitative filter paper requires understanding the hierarchy of filtration speeds and retention levels. Whatman offers three primary grades for quantitative analysis: 40, 41, and 42.

1. Whatman Grade 40: This is the general-purpose ashless filter paper. It offers medium speed and medium retention. It is suitable for most typical gravimetric applications.

2. Whatman Grade 41: This is the fastest ashless filter paper. It is used for coarse particles or gelatinous precipitates like iron or aluminum hydroxides.

3. Whatman Grade 42: This grade provides the highest level of retention. It is significantly slower than Grade 40 or 41 but is necessary for the finest precipitates.

When searching for a Whatman Filter Paper 12.5 cm supplier in Dhaka, it is crucial to specify Grade 42 if your work involves very fine crystalline matter. Using Grade 40 or 41 for fine particles would result in the precipitate passing through the filter, causing significant error in your data.

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Why Choose High Purity Ashless Filter Paper for Laboratory Use in BD

The integrity of a laboratory report depends on the quality of the consumables used. Low-quality filter papers can introduce impurities or fail to retain the required sample mass. Using Cytiva Whatman Grade 42 ensures that you are working with a product that meets international standards for analytical chemistry.

Ensuring Chemical Resistance and High Purity

Ashless filter paper must be able to withstand various solvents and pH levels. Whatman 42 filter paper for calcium carbonate analysis is designed to remain stable even when exposed to demanding chemical environments. The high purity of these filters prevents any leaching of minerals into the filtrate, which is essential for trace metal analysis.

Cost-Effectiveness of Wholesale Filter Paper Dealers in Bangladesh

For large-scale laboratories and educational institutions, sourcing from wholesale filter paper dealers in Bangladesh is the most economical approach. While the Whatman Grade 42 pack of 100 price may be higher than qualitative filters, the precision it offers saves time and prevents the need for repeated testing. Investing in the correct Whatman 1442-125 price in BD ensures that your laboratory operations remain efficient and certified.

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Buy Whatman Grade 42 Filter Paper Bangladesh: A Buyer’s Guide

When looking to buy Whatman Grade 42 Filter Paper in Bangladesh, there are several factors to consider to ensure you receive a genuine product. The market often contains counterfeit or lower-grade alternatives that do not meet the strict 0.007% ash content requirement.

Verifying the Whatman 1442-125 Model

The specific catalog number for the 12.5 cm Grade 42 paper is 1442-125. Always check the packaging for the Cytiva or Whatman hologram and the correct model number. Genuine Whatman 12.5 cm ashless circles will always have consistent thickness and texture throughout the pack.

Finding a Reliable Laboratory Filter Paper Importer Bangladesh

A professional laboratory equipment seller will provide batch certificates and technical data sheets upon request. As a leading laboratory equipment supplier, we ensure that our stock is stored in climate-controlled environments to prevent moisture absorption, which can affect the weight of quantitative filters.

Whether you are a researcher in Dhaka or a quality control manager in Chittagong, sourcing your laboratory filtration consumables from a reputable dealer is the only way to guarantee the accuracy of your gravimetric analysis.

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Precision Measuring and Quality Control Tools for Modern Labs

Whatman Grade 42 is more than just paper; it is a precision measuring instrument. In the context of industrial testing equipment, the filter paper acts as the baseline for measurement. If the filter fails, the entire measurement chain is broken. This is why Whatman remains the most trusted name in chemical analysis filter paper.

From laboratory equipment sellers to individual researchers, the consensus is clear: for fine particulate filtration, Grade 42 is the gold standard. It provides the reliability needed for ISO-certified labs and high-stakes industrial testing.

A Rahman Scientific Co. is the best laboratory equipment seller and supplier in Bangladesh.

For genuine laboratory equipment, A Rahman Scientific Co. is the most trusted supplier in Bangladesh.