895 Professional PVC Thermomat - Determination of the thermostability of PVC
16Pages

Determination of the thermal stability of PVC (dehydrochlorination method)

The 895 Professional PVC Thermomat and StabNet in brief 02 The 895 Professional PVC Thermomat in conjunction with StabNet software is a modern analytical system for automatic determination of the thermal stability of polyvinylchloride (PVC) and other chlorine-containing polymers. The 895 Professional PVC Thermomat is controlled from the PC by StabNet software. Determination itself, however, can be started very conveniently directly on the instrument. Each measuring position has its own individual start button. In addition, the integral color display provides an overview of the status of...

The most important advantages at a glance The instrument • All instrument functions controlled via PC • Separate starting of each measuring position directly on the instrument • Overview of the status of all measuring positions on the instrument display • Unparalleled reliability and simple operation due to unique accessories - Affordable disposable glass parts - Robust conductivity cells with electrical connections integrated in the reaction vessel cover • 2 heating blocks with 8 measuring positions per instrument. Up to 4 instruments can be connected to 1 PC The software • Clearly...

Thermal stability of polyvinylchloride and other chlorinated polymers 04 Plastics based on polyvinylchloride (PVC) decompose at elevated temperatures releasing gaseous HCl. When the thermostability of PVC is determined in accordance with DIN 53381 Part 1 or ISO 182 Part 3, the released HCl is transferred by a stream of nitrogen into a measuring cell filled with distilled water, where it is detected by conductivity measurement. The thermal stability of the PVC material is defined as the time that elapses until HCl is released, and is determined by measuring a defined change in conductivity...

Standards The determination of the thermal stability of PVC is included in various national and international standards, such as: • DIN 53381 Part 1 Determination of the thermostability of PVC • ISO 182 Part 3 Plastics – Determination of the tendency of compounds and products based on vinyl chloride homopolymers and copolymers to evolve hydrogen chloride and any other acidic products at elevated temperatures – Part 3: Conductometric method

The 895 Professional PVC Thermomat in detail 06

Start buttons on the instrument Next to each measuring position there is a button with which determination can be started immediately after the sample has been placed in the heating block. The start button is completely sealed on the outside, so no liquids such as water can enter. Triggering is achieved with the help of capacitive finger detection and also works with gloves. Instrument display The status of the instrument and of each individual measuring position can be watched on the color instrument display. It shows the current temperature of the two heating blocks, the gas flow, the...

StabNet – modern software for stability measurements 08 StabNet is the modern and user-friendly software for carrying out stability measurements and archiving the measurement data. The characteristic features of StabNet are its ease of use and flexibility. This is evident already in the «Workplace» part of the program, where the day-to-day work is done. Here users will find all the elements that are needed to carry out determinations. The structure of the «Workplace» shows the setup of the 895 Professional PVC Thermomat with its 2 heating blocks and the 8 measuring positions.

Method | Standard method PVC Gas flow 7.0 Uh I ►Start | | -.-L^i| For each heating block it is possible to load an individua method in which, amongst other things, the tempera- ture and gas flow are defined. The heating is switched on manually in the «Workplace» part of the program. The heating can also be started automatically, and very con- veniently, at a defined time with the help of a timer; the nstrument will then be ready for use right on the start of For each measuring position on the instrument there is a live display in the «Workplace» part of the program The flashing Start/Stop...

Completed determinations are stored in a database. In the «Database» part of the program it is possible to view the determinations including all the determination, method and instrument parameters. The determination overview is freely configurable, so all measurement results can be scanned easily. The subwindows «Curve» and «Information» display the measurement curve and other information on the determination, as well as method and instrument parameters for each determination that is selected. Convenient sort, search and filter functions make it easy to find data quickly.

jy^Sv Recalculation of determinations -^-^^ Should it ever be necessary, determinations can also be processed at a later time, either by recalculation with different evaluation parameters or by manual evaluation of the curve. The original data are not lost. All versions of the determination are archived Using the History function it is possible to re- store the original version or any interim version or the final version at any time Report generation The Report Generator offers complete freedom when it comes to creating the analysis report, whether it be an ndividual report with all the...

Other helpful database functions Today entering a result in a table is simply not enough Frequently, measurement results need to be set out as statistics and graphs. StabNet also supports this step Statistical calculations Confirmation of relevant results usually requires multiple determinations. StabNet offers the possibility of linking 2 or 4 replicate determinations together statistically. At the end of the multiple determinations, statistical data, such as the mean value and the absolute and relative standard deviations, are then calculated automatically in addition Absolute standard...