VWR Grade 474 Filter Paper, Quantitative 28306-404 Review

One Week with the VWR Grade 474 Filter Paper, Quantitative 28306-404

For any laboratory professional, the reliability and consistency of consumables are paramount. The VWR Grade 474 Filter Paper, Quantitative 28306-404, from VWR, promises precisely that: dependable performance for crucial quantitative analyses. This particular grade of filter paper is designed for specific applications, aiming to deliver accuracy without breaking the bank, a common challenge in laboratory procurement.

My need for this specific filter paper arose from a recurring issue with inconsistent results in our gravimetric analysis procedures. We were experiencing slight variations in precipitate recovery, which, while small, were enough to push the boundaries of acceptable error margins for our critical assays. This prompted a thorough review of our consumables, leading me to seek a filter paper known for its low ash content and consistent pore size.

Upon receiving the package, my initial impression was one of straightforward utility. The paper itself felt substantial yet flexible, a characteristic that often indicates good quality for this type of product. The packaging was functional, designed to protect the filters from moisture and damage during transit.

I considered a few other options, including some generic laboratory supply brands that offered lower price points but lacked the specific quantitative grading that VWR emphasizes. Ultimately, the reputation of VWR for laboratory essentials and the specific designation of “quantitative” on this model tipped the scales. My first reaction was a quiet sense of optimism; it felt like a step in the right direction for resolving our analytical headaches.

Real-World Testing: Putting VWR Grade 474 Filter Paper, Quantitative 28306-404 to the Test

First Use Experience

My testing primarily took place on our standard laboratory bench, focusing on its performance in gravimetric analysis. Specifically, I used the VWR Grade 474 Filter Paper, Quantitative 28306-404 for filtering precipitates of aluminum phosphate and zinc ammonium phosphate, as recommended in its product description. The paper handled these solutions admirably, retaining the fine precipitates effectively without significant clogging.

I subjected these quantitative filter papers to repeated use in our routine analysis protocols, including multiple washes with dilute acids and water. Even after several cycles of filtration, washing, and drying, the paper maintained its structural integrity, showing no signs of premature tearing or disintegration. The ease of use was immediately apparent; it fit standard Büchner funnels without issue and folded cleanly for cone filtration when needed.

One minor surprise was the slightly longer drying time compared to some coarser filter papers I’ve used in the past. However, this is a common characteristic of quantitative papers designed to retain very fine particles. There were no significant quirks or issues to report from this initial testing phase; the paper performed as expected for its intended quantitative applications.

Extended Use & Reliability

Over several weeks, the VWR Grade 474 Filter Paper, Quantitative 28306-404 became a staple in our gravimetric analyses. It continued to hold up exceptionally well, providing consistent results batch after batch. The low ash content was particularly noticeable, as the residual weight after ignition was minimal and highly reproducible, which is critical for accurate quantitative measurements.

There are no discernible signs of wear and tear on the paper itself, even after being handled with forceps and subjected to oven drying at elevated temperatures. Its durability under standard laboratory conditions is impressive for a disposable consumable. Maintenance is minimal, as it’s designed for single-use filtration and subsequent incineration or disposal, though careful handling during transfer to the drying oven is always advised.

Compared to some of the generic, unrated filter papers I’ve encountered, this VWR product significantly outperforms in terms of reproducibility and reliability. While some premium brands might offer specialized grades for extreme conditions, for general quantitative analyses, this particular model strikes an excellent balance between performance and cost.

Breaking Down the Features of VWR Grade 474 Filter Paper, Quantitative 28306-404

Specifications

The VWR Grade 474 Filter Paper, Quantitative 28306-404 comes in a 100-pack bulk quantity, offering a practical supply for regular laboratory use. The paper is manufactured with a specific pore size distribution, designed for excellent retention of fine precipitates. Its low ash content is a critical specification for quantitative analysis, ensuring that the filter paper contributes negligible weight after ignition, thereby minimizing errors in gravimetric measurements.

These specifications are crucial because they directly impact the accuracy of analytical results. The defined pore size ensures that the intended particulate matter is retained on the filter surface, while the low ash content means that when the filter is burned off, the remaining residue is primarily the analyte, not the filter material itself. Compared to qualitative filter papers, which are designed for separating precipitates from liquids but not for quantitative measurement, this quantitative grade offers a significant advantage.

Performance & Functionality

The primary function of the VWR Grade 474 Filter Paper, Quantitative 28306-404 is to facilitate accurate quantitative filtration. It performs exceptionally well in this regard, effectively trapping fine precipitates such as aluminum phosphate and zinc ammonium phosphate with minimal loss. The paper demonstrates good wet strength, meaning it doesn’t easily tear when saturated with solution or during washing.

A significant strength of this filter paper is its consistent performance, which is vital for reproducible analytical outcomes. Its main weakness, if one can call it that, is its filtration speed; it is not the fastest paper on the market, which is a trade-off for its ability to retain very fine particles. However, for its intended use in quantitative analysis, the speed is more than adequate and does not detract from its overall effectiveness. It comfortably meets and often exceeds expectations for general quantitative work.

Design & Ergonomics

The design of this filter paper is focused on functionality rather than aesthetic flair, which is typical for laboratory consumables. It arrives in a protective package, typically a flat box or ream, designed to keep the circular or folded sheets clean and undamaged. The paper’s texture is smooth but with a discernible porosity that is visually evident under magnification, indicating its filtering capability.

Ergonomically, the paper is easy to handle, whether folded into a cone for gravity filtration or placed into a Büchner funnel for vacuum filtration. The uniform thickness across the sheets contributes to a predictable performance, and the material feels robust enough to handle the wet filtration process without collapsing. There’s no real learning curve; it’s a matter of understanding its specific grade and matching it to the appropriate filtration task.

Durability & Maintenance

As a disposable laboratory consumable, the durability of the VWR Grade 474 Filter Paper, Quantitative 28306-404 is measured by its ability to withstand the filtration and drying processes without degrading. Under normal laboratory conditions, including repeated washing and oven drying (typically up to 110°C for gravimetric analysis), the paper holds its structure admirably. It is designed to be incinerated, leaving minimal ash, which is its ultimate disposal method for quantitative purposes.

There are no complex maintenance requirements, as it is intended for single use. However, careful handling is key to maintaining its integrity. For instance, ensuring the filter paper is properly seated in the funnel prevents bypass, and gentle transfer to the drying oven avoids accidental tears. Potential concerns are minimal, but one should always be mindful of not overloading the filter with excessive precipitate, which could lead to clogging or tearing.

Accessories and Customization Options

The VWR Grade 474 Filter Paper, Quantitative 28306-404 itself is the primary component; it doesn’t come with separate accessories in the way electronic equipment might. However, it is designed to be used with standard laboratory filtration apparatus. This includes Büchner funnels of various sizes, filtration flasks, and vacuum sources, as well as standard glass funnels for gravity filtration.

While there isn’t direct “customization” of the paper itself, its compatibility with standard lab equipment is its key feature. For instance, these filter papers are readily available in different diameters (e.g., 7 cm, 9 cm, 11 cm), allowing users to select the size that best fits their filtration apparatus. This versatility makes it easy to integrate into existing laboratory workflows without the need for specialized adapters or equipment.

Pros and Cons of VWR Grade 474 Filter Paper, Quantitative 28306-404

Who Should Buy VWR Grade 474 Filter Paper, Quantitative 28306-404?

This quantitative filter paper is ideal for laboratory technicians, chemists, and researchers who perform gravimetric analysis and require reliable results. It’s perfectly suited for general quantitative analyses in academic research, quality control laboratories, and industrial settings where precise measurement of precipitates is necessary. Anyone conducting analyses involving the filtration of fine inorganic precipitates will find this paper highly beneficial.

Those who need ultra-fast filtration speeds for non-quantitative purposes, or who require papers specifically certified for sterile environments (like pharmaceutical or medical diagnostics), should look elsewhere. For users performing routine elemental analysis, environmental testing, or any assay that relies on accurately weighing filtered solids, this VWR product is an excellent choice. Essential complementary items would include standard laboratory filtration glassware like Büchner funnels and appropriate drying ovens.

Conclusion on VWR Grade 474 Filter Paper, Quantitative 28306-404

The VWR Grade 474 Filter Paper, Quantitative 28306-404 stands out as a dependable consumable for any laboratory engaged in quantitative analysis. Its core strengths lie in its low ash content and consistent particle retention, which translate directly into more accurate and reproducible analytical results. While its filtration speed is not the fastest, this is a predictable trade-off for the high level of performance it offers in its intended applications.

Considering its price point, which is quite reasonable for a quantitative-grade filter paper, the value proposition is strong. It delivers the reliability and precision that laboratory professionals demand without an exorbitant cost. I would personally recommend this filter paper to anyone needing a robust and trustworthy option for general quantitative filtration tasks. If accurate gravimetric analysis is part of your routine, this model is definitely worth adding to your lab supplies.