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IR5 MCT Frequently Asked Questions

We are aware that acquiring a lab instrument is an important decision, furthermore if Polyolefins’ research is related with your core business.

Although you can ask directly to our consultants whenever you want, you may prefer to know first the answers to the most typical questions about our instruments. Here are packed the most relevant questions about IR4 MCT.



Is IR5 MCT a detector or a spectrometer?
IR5 MCT is a stand-alone infrared detector with a heated flow through cell, which uses the principle of infrared absorption spectroscopy at fixed wavelengths, through the use of interference filters, to measure the concentration and composition in polymer solutions.

The continuous signals at different bands in the MID-IR from the multiple filter system included in the detector are provided in real time, allowing very simple processing and fast analysis applications as high-throughput GPC.

Does it require the use of Liquid Nitrogen?
No, it doesn’t. All the components of the detector were intended for a very robust and simple equipment; that is why thermoelectric cooled MCT detectors were included, avoiding the use of liquid nitrogen.

Which solvents can be used?
Any solvent which is transparent in the band of interest and compatible with the detector cell materials: stainless steel, sapphire, and Teflon, etc.

Which are the most important applications?
Concentration and composition measurement in liquid chromatography separation techniques like GPC, TREF, CRYSTAF or HPLC.

IR5 is especially designed for the most demanding applications on composition measurement of polyolefins, mainly in HDPE resins, due to its high sensitivity to measure very low values of methyls content. IR5 MCT is also a very sensitive and stable detector for concentration measurement in GPC analysis of Polyolefins.

Which are the differences between IR4 and IR5 MCT?
IR4 is the optoelectronic standard detector for most applications. It can fit up to four sensing elements, although for improved sensitivity is normally provided with two measuring elements. The IR4 is a very robust detector for concentration measurement in GPC, TREF, CRYSTAF, etc. It also provides the possibility to measure composition (methyls per 1000 carbons or level carbonyls, acetate, acrylate…) in copolymers.

The IR5 MCT is the most sensitive detector by using a specially designed MCT thermoelectrically cooled sensing element. It can incorporate up to 5 wavelengths measurement and it provides a superior stability and sensitivity in the GPC analysis of Polyolefins. It is being used in most demanding applications such as the analysis of very low levels of branching (methyls) in HDPE pipe resins.

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