Is formic acid compatible with borosilicate glass – FAQ

Yes, formic acid is generally compatible with borosilicate glass. There are two aspects that one needs to be mindful of when storing formic acid in glass vials or glass inserts: Formic acid gradually decomposes to carbon monoxide (CO) and water, building up pressure inside the container. The warmer the solution the faster the process. Therefore, […]

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Is the PTFE in the AQR brand screw cap cast or skived – FAQ

The PTFE is “cast” for the AQR™ septa in the screw caps which includes our catalog number 9509S-10C-B as well as many other AQR brand screw and snap caps. It is much easier to control the quality of “cast” PTFE over the “skived” PTFE which results in much better reliability and performance from batch to batch. The […]

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PFAS analysis using glass or plastic vials – Tips and Suggestions

In order to take the most accurate accurate analysis of PFAS special care must be taken for storage and sampling. Glass and also low-density polyethylene (LDPE) materials are not recommended for storing PFAS samples. PFAS can adsorb to glass, particularly when the chemicals are stored in a glass container for extended periods of time. Recommended […]

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RSA-Pro X vial improve quantitation precision with HPLC – AppNote

RSA-Pro X™ – Hydrolytically stable hydrophobic glass vials & low volume glass inserts Silanol groups (Si-OH) on the surface of glass has been known to cause not only empirical quantitative loss but also inaccurate quantitation, vial to vial and run to run over time. Silanol sites are very reactive and can produce among other things, […]

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Screw and Snap Cap Evaporation Studies

Evaporation of solvent from the autosampler vial can be a significant issue for samples that are left out for several days before analysis. The evaporation can change the concentration of analytes in solution and cause quantitative errors. For these reasons, it is important to know what factors affect evaporation. The volatility of the solvent is […]

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Screw thread call out definition – Tech Information

What is a screw thread call-out for English fittings? This is a common system for describing the threading on a fitting or screw cap that uses the English method. The thread Call-Out normally consists of two numbers where the first number will refer to the diameter of the widest thread and the second one refers […]

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What are Soft Guard caps and septa – FAQ

Soft-Guard™ cap septa are used in HPLC, GC, LCMS or GCMS for autosampler vials when a quality value is desired. Soft-Guard™ septa are made with a unique formulation of high purity silicone rubber and cast PTFE to minimize extractables often found in septa that can cause interfering peaks which lowers the quality of your data. […]

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What does Residual Volume mean with Autosampler Vials?

The syringe needle of an autosampler does not go all the way to the bottom of a vial during injection, and therefore some sample will always remain in the vial. This is referred to as the Residual Volume of the Autosampler Vial. Some Vials have a tapered bottom for example, which decreases the Residual Volume. […]

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What is a pyrogen – FAQ

The definition according to answers.com is “A pyrogen is defined as a fever-producing agent. Pyrogens are substances that cause febrile reactions when sufficient amounts enter the circulatory system. Bacterial endotoxin is the most significant pyrogen because of its potency and ubiquity.”

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What is the advantage or disadvantage of using Certified autosampler vials compared to MicroSolv vials – FAQ

Because vials are marketed as “Certified” does not change the quality of a vial or cap simply by supplying a certificate. Testing procedures for every type of sample and for every application/analysis method cannot be performed economically. Therefore, even certified vials may not produce the assurance they claim to offer, only producing additional costs. MicroSolv […]

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What is the Difference between 45 Shore A and 55 Shore A Septa?

“Shore” is a measure of the hardness of a material, named after Albert F. Shore. The letter designates the “scale,” which specifies what type of substance is described. In this case, A refers to flexible mold rubbers/plastics. The numbers go from 0 to 100, with 0 being the softest and 100 being the hardest. Hence, cap septa with […]

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What is the pressure rating of MicroSolv headspace vials and caps – FAQ

Headspace vials are designed to withstand a small amount of internal pressure, therefore all MicroSolv brand headspace vials have a wall thickness of 1.2mm for added safety, thus it is assured that the vial will not burst.  Contrary to popular belief, the seal and not the vial represents the weakest part of the entire system. Under […]

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What is the purpose of a partial slit septa?

The partial slit septa offers both a penetration aid for thick and dull needles plus prevents evaporation resulting in concentration changes. Only the silicone rubber is cut, the PTFE is not pre cut acting as an evaporation barrier.

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What is the useable Volume in 2mL Autosampler Vials? – FAQ

A vial that is listed as 2mL is defined as the entire fill volume, with no headspace when the cap is secured.  In practice though, a sample solution cannot contain this much volume because of displacement caused by the syringe needle during injection causing the autosampler to inaccurately withdraw the solution. For this reason, a […]

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When to use snap caps vs screw caps preventing evaporation – FAQ

Snap caps are chosen strictly for convenience in ease of applying the cap to the vial, such as in the case of capping hundreds of samples at a time. Screw caps on the other hand provide a better seal (when the cap is properly matched to the vial threading) and is therefore more reliable. An important thing to consider […]

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Which rack should I use for 20mL vials – FAQ

The MicroSolv catalog number you will need for 20mL vials is 95040-SB1: “Storage Box / Rack with cover, PP, for 20ml EPA / VOA vials, violet, 130mm x 130mm x 102mm. 16 cavities.” There is also a rack suitable for headspace autosampler vials. The part number here is 95025-SB: “Storage Box / Rack with cover, […]

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Which vials compatible with SPME – FAQ

The following two items are compatible with Solid Phase Micro-Extraction (SPME): Catalog # 95020-45S-T: Magnetic Screw Cap for Headspace. Silver, 8mm Center Hole, Silicone Transparent Blue/PTFE White, 45 Shore A, 1.3mm Thick. Precision Threads. 100/PK. Catalog # 95010-0CV: Vials, head space, 10ml, 46 x 22.5mm, screw top, clear borosilicate glass, round bottom. CTC Compliant. Precision threads 100/PK. However, the […]

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