When preparing samples for PFAS analysis, laboratories face one of the most pressing challenges in environmental testing: avoiding cross-contamination. Even trace exposure to fluoropolymer-based materials can compromise results. That’s why Organomation developed PFAS-free nitrogen evaporators — purpose-built to eliminate this risk while maintaining the same performance and usability as our standard models.But what exactly makes them different? Let’s break it down.<h4>Construction Materials in Standard Evaporator Models</h4>All Organomation nitrogen evaporators are designed for durability and compatibility with a wide range of solvents. Our standard models are built from:<ul><li>316 stainless steel</li><li>Anodized aluminum</li><li>Acetal</li><li>Nylon</li><li>Polypropylene</li><li>Nitrile rubber</li><li>Polyurethane</li><li>Silicone</li></ul>These high-quality materials come into contact with nitrogen gas as it’s delivered to the sample, ensuring reliable operation across countless workflows. However, standard units also use Teflon (PTFE) tape on gas fittings as a thread sealant. While PTFE is chemically resistant and effective for sealing, it introduces a fluoropolymer material into the gas pathway, which poses a risk of PFAS contamination for labs conducting <a target="_blank" rel="noopener noreferrer" href="https://blog.organomation.com/blog/the-importance-of-detecting-per-and-polyfluoroalkyl-substances-pfas">ultra-trace PFAS analysis</a>.<img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Organomation_Construction_Materials_in_Standard_Evaporator_Models_603a06d7b2.jpg" alt="Organomation: Safe Sample Prep for PFAS Analysis: PTFE-Free Concentrators Explained" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Organomation_Construction_Materials_in_Standard_Evaporator_Models_603a06d7b2.jpg 188w," sizes="100vw" width="540" height="447"><h4>What Changes in Our PFAS-Free Models?</h4>Our <a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products?manufacturerItems=540&amp;search=N-">PFAS-free evaporators</a> (designated with the “-NT” suffix) are nearly identical to their standard counterparts in appearance, performance, and cost. The critical difference lies in how we seal the nitrogen gas fittings.Instead of PTFE tape, PFAS-free units use a specialized PTFE-free sealant to secure the threads. This eliminates the introduction of fluoropolymers into the nitrogen pathway, making the instrument fully safe for PFAS testing.To put it simply:<ul><li>Organomation's standard evaporators: Uses PTFE tape as a sealant</li><li>Organomation's PFAS-Free evaporators: Uses PTFE-free thread sealant instead</li></ul>Both models will look identical on your lab bench, operate with the same reliability, and come at the same price point. The only distinction is that the PFAS-free version guarantees your nitrogen stream will not pass over any fluoropolymer materials.<h4>Why This Matters for PFAS Testing</h4>When it comes to PFAS analysis, accuracy depends on eliminating contamination at every step of the workflow. Because PFAS are fluorinated compounds, any exposure to fluoropolymers in the lab can introduce false positives or compromise ultra-trace results. Even a small amount of PTFE thread sealant inside a nitrogen line is enough to skew data.That’s where Organomation’s N-EVAP product line stands out. The N-EVAP has been the industry’s benchmark nitrogen evaporator for decades, trusted for its durability, ease of use, and efficient sample preparation. For labs following <a target="_blank" rel="noopener noreferrer" href="https://blog.organomation.com/blog/epa-533-drying-down-pfas-samples-after-spe">EPA Method 533</a>, <a target="_blank" rel="noopener noreferrer" href="https://blog.organomation.com/blog/sample-concentration-epa-method-537-pfas-determination">EPA Method 537.1</a>, or <a target="_blank" rel="noopener noreferrer" href="https://blog.organomation.com/blog/preparing-diverse-sample-matrices-for-epa-method-1633">EPA Method 1633</a>, which require extremely low detection limits, the PFAS-free N-EVAP provides peace of mind by ensuring nitrogen never passes over fluoropolymer materials. This makes it the safest option for preparing PFAS samples without the risk of background interference.It’s no surprise that leading environmental labs and major instrument manufacturers trust our N-EVAPs for their PFAS workflows. In fact, as detailed in this case study, <a target="_blank" rel="noopener noreferrer" href="https://blog.organomation.com/blog/concentrating-pfas-samples-ahead-of-lcms">Organomation evaporators play a critical role in sample preparation for Water's Corporation</a>, one of the most respected PFAS testing labs in the country.<img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Organomation_PFAS_free_evaporators_d5349ec038.jpg" alt="Organomation: PFAS-free evaporators" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Organomation_PFAS_free_evaporators_d5349ec038.jpg 109w," sizes="100vw" width="758" height="1080"><h4>The Bottom Line</h4>If your lab is running PFAS analyses, the safest path is clear: select a <a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products?manufacturerItems=540&amp;search=N-">PFAS-free sample concentrator</a> to ensure no contamination risks from fluoropolymers. With Organomation, you don’t have to compromise — both the standard and PFAS-free models deliver the same performance, durability, and cost efficiency. The only difference is peace of mind for your PFAS workflows.<blockquote>To discuss your lab's specific PFAS sample preparation needs, contact our team at sales@organomation.com.&nbsp;</blockquote>

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Organomation, founded in 1959, designs and manufactures high-quality nitrogen evaporators and extraction systems. Known for innovation and durability, their lab instruments are used globally for efficient sample preparation with strong customer support.

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