Let’s Dive into VWR Jars, PTFE 38.36
The VWR Jars, PTFE 38.36 from VWR might not be the kind of gear you’d expect an outdoor and tactical specialist to review. However, understanding the materials and containers used for sample collection and preservation in the field is paramount, whether for environmental monitoring, forensic science, or even caching survival supplies. These jars, made of PTFE (Teflon), are specifically designed for laboratory use where chemical inertness and purity are critical, properties that translate surprisingly well to certain outdoor and tactical applications.
My interest in these jars stemmed from the need for a reliable, chemically resistant container for storing sensitive samples collected during environmental impact assessments in remote areas. I needed something that wouldn’t leach contaminants into the samples or degrade over time when exposed to extreme temperatures. The listed specifications of the VWR Jars, PTFE 38.36, particularly the FDA-approved PTFE material and suitability for IPA Method 1311 TCLP (Toxicity Characteristic Leaching Procedure), suggested they would be a great option.
Upon receiving the VWR Jars, PTFE 38.36, the first thing I noticed was the robust build quality and thick wall construction. The smooth internal finish was also reassuring, indicating careful molding and minimizing potential contamination points. Compared to standard glass or plastic sample jars, these felt significantly more durable and chemically resistant. I was particularly drawn to these over cheaper polypropylene options due to PTFE’s superior resistance to a wider range of chemicals and temperatures.
My first impression was cautiously optimistic, even though the price tag of $439.99 felt steep for a single jar. The quality and potential applications seemed promising, but the real test would be how they performed in the field.
Real-World Testing: Putting VWR Jars, PTFE 38.36 to the Test
First Use Experience
My initial test involved using the VWR Jars, PTFE 38.36 to collect and store soil samples during a survey of a former military training area. The conditions were challenging, with temperatures ranging from near freezing in the mornings to above 70°F in the afternoon, with periods of light rain. The jars were used to hold soil samples intended to be tested for trace amounts of heavy metals and organic contaminants.
The jars were easy to handle and fill in the field, and the screw-on cap provided a secure seal, preventing any leaks or spills. Even with temperature fluctuations, there was no noticeable deformation or degradation of the PTFE material. Cleaning the jars between sample collections was also a breeze, as the smooth, non-stick surface of the PTFE allowed dirt and debris to be easily wiped away.
After the first use, I did notice that the cap, while secure, required significant torque to tighten completely. It wasn’t necessarily an issue, but it meant being extra careful to avoid cross-threading.
Extended Use & Reliability
After several months of using the VWR Jars, PTFE 38.36 for various field projects, including water sampling from remote streams and storing plant specimens for analysis, I can confidently say that they have held up remarkably well. There are no signs of wear and tear, cracking, or discoloration, even after repeated exposure to harsh chemicals and UV radiation. The PTFE material remains flexible and resilient, maintaining its integrity and sealing properties.
Cleaning and maintaining the jars is straightforward; a simple rinse with water and mild detergent is usually sufficient. Occasionally, I’ve used a dilute solution of hydrochloric acid to remove stubborn mineral deposits, with no adverse effects on the PTFE. Compared to using glass jars, the PTFE jars are significantly more resistant to breakage and chipping, giving me greater peace of mind when working in rugged terrain. These outperform standard plastic jars in almost every respect due to the greater chemical resistance.
Breaking Down the Features of VWR Jars, PTFE 38.36
Specifications
- Volume: 360 mL (12 oz). This capacity is ideal for most sample collection needs, providing enough space without being excessively bulky or heavy.
- Height: 95 mm. The compact height makes the jar easy to pack and store in a field kit or backpack.
- Cap Diameter: 90 mm. A wide opening facilitates easy filling and retrieval of samples.
- Material: FDA-approved PTFE (Teflon). PTFE’s chemical inertness, temperature resistance, and non-stick properties are crucial for maintaining sample integrity.
- Construction: Isostatically molded with thick wall construction and smooth internal finish. This ensures uniform density, strength, and minimizes potential contamination points.
- Suitability: Suitable for IPA Method 1311 TCLP. This confirms the jar’s compatibility with standard EPA testing protocols.
These specifications matter because they guarantee the VWR Jars, PTFE 38.36 will not interfere with the chemical composition of the sample being stored within it. The isostatic molding contributes to consistent performance across the jar and it’s resistance to mechanical failures.
Performance & Functionality
The VWR Jars, PTFE 38.36 excels at its primary job: preserving the integrity of collected samples. The PTFE material prevents leaching, absorption, or chemical reactions that could alter the composition of the sample. It functions reliably in a wide range of environments, from cold mountain streams to hot desert landscapes.
A key strength is the broad chemical resistance; many chemicals which would degrade other plastics have little to no effect on the PTFE. A minor weakness is the relatively high cost compared to other types of sample containers. The price is worth it, though, if sample integrity is paramount. It meets all expectations, based on the price point and manufacturing.
Design & Ergonomics
The build quality is excellent, with a solid, well-molded construction. The PTFE material is lightweight yet durable, making it easy to handle in the field. The wide mouth and screw-on cap are well-designed and user-friendly.
The jars are stackable, making them easier to organize and transport. There’s no significant learning curve; they are intuitive to use.
Durability & Maintenance
The VWR Jars, PTFE 38.36 is built to last, even under demanding conditions. The PTFE material is highly resistant to degradation, cracking, and chemical attack. With proper care, they should provide years of reliable service.
Maintenance is simple; cleaning with mild soap and water is usually sufficient. More aggressive cleaning agents can be used if necessary, without damaging the PTFE.
Accessories and Customization Options
The VWR Jars, PTFE 38.36 comes with a screw-on cap, which is essential for sealing the jar and preventing leaks. There are limited customization options, as the jar is primarily designed for laboratory use. The jar does not come with any additional accessories.
While not specifically designed for it, the jar’s dimensions could likely be used with standard bottle carriers for transport.
Pros and Cons of VWR Jars, PTFE 38.36
Pros
- Exceptional chemical resistance: The PTFE material is inert to virtually all chemicals, ensuring sample integrity.
- Wide temperature range: Can withstand extreme temperatures without degradation.
- Durable construction: The thick wall and isostatically molded design provide excellent resistance to impact and wear.
- Easy to clean: The non-stick surface makes cleaning quick and easy.
- FDA-approved material: Ensures the jar is safe for storing samples intended for human consumption or analysis.
Cons
- High cost: The VWR Jars, PTFE 38.36 is significantly more expensive than other types of sample containers.
- Cap tightness: The cap requires significant torque to tighten, which can be a minor inconvenience.
Who Should Buy VWR Jars, PTFE 38.36?
The VWR Jars, PTFE 38.36 is perfect for environmental scientists, chemists, and researchers who require a chemically inert and durable container for collecting and storing sensitive samples. These jars would also be valuable for forensic investigators and professionals who need to maintain the integrity of evidence collected in the field. Anyone involved in storing critical or sensitive substances that must not be contaminated by the container itself will benefit greatly from this product.
If cost is a primary concern and the application does not require extreme chemical resistance, a cheaper alternative, such as polypropylene jars, may be sufficient. Individuals who need a container that is easy to open and close with minimal effort may find the cap tightness of the VWR Jars, PTFE 38.36 inconvenient.
A must-have accessory is a label maker for clearly identifying the contents of each jar and a waterproof marker for writing on the labels.
Conclusion on VWR Jars, PTFE 38.36
The VWR Jars, PTFE 38.36 is a specialized product designed for a specific purpose: preserving the integrity of sensitive samples. While the high price tag may deter some, the exceptional chemical resistance, durability, and ease of cleaning make it a worthwhile investment for those who require the highest level of performance.
The value proposition is strong if the need for a chemically inert container outweighs the cost. I would personally recommend this product to anyone who needs a reliable and durable container for storing sensitive samples in demanding environments. It’s a niche product, but it excels in its intended application. For those in specialized fields requiring such levels of chemical isolation and stability, the VWR Jars, PTFE 38.36 is well worth the price.