Melting Point, Boiling Point, Cloud Point, and Slip Melting Point | METTLER TOLEDO
Melting Point Excellence

Melting Point Excellence

Automatic melting point, boiling point, cloud point, and slip melting point determination

 

Automatic Melting Point Instruments

Unlike manual measurements which are time consuming and error prone, there is no need for continuous visual observation with our Excellence Melt...

Unlike manual measurements which are time consuming and error prone, there is no need for continuous visual observation with our Excellence Melting Point Systems. The measurement is done fully automatically, detection of transmitted light combined with video observation ensures that the melting point, melting range, slip melting point, boiling point, and cloud point measurements are reliable. Statistical evaluation with standard deviation and mean value.allow you to have full confidence in your data.

Ensure full compliance with the relevant international and national standards and norms, such as Ph.Eur. 2.2.60, USP<741>, Ch.P. 0612, and Japanese JIS


 

Products and Specs

 
Products and Specs
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Temp. Range
Number of One Clicks™
Application type
Data export
Heating Rate (/min)
Material No.: 30321330
See details
Temp. RangeRT – 300 °C
Number of One Clicks™12
Application typeMelting point; Slip melting point
Data exportNo
Heating Rate (/min)0.1 °C – 20 °C
Min. Cooling Time (Tmax to 50 °C)4 min
Min. Heating Time (50 °C to Tmax)3
Number of capillaries/cups2 slip melting point capillaries; 3 melting point capillaries
PDF reportsNo
Stored Methods0
Stored results10
User ManagementMultiple Users
Substances in database0
Videocolor, 60 minutes
Material No.: 51142502
See details
Temperature RangeRT – 350 °C
Number of One Clicks™12 Per User
Data ExportTo SD Card or PC
Cooling time (300°C to 50°C)5.5 min
Heating time (50°C to 300°C) (min)4
Number of Capillaries (2)4 Melting Point Capillaries
PDF ReportsYes
Stored Methods20
Stored Results50
User ManagementMultiple Users; Password Protection; Protection of Settings
Substances in database5
Videocolor, 300 minutes
Material No.: 30321331
See details
Temp. RangeRT – 350 °C
Number of One Clicks™12 Per User
Application typeMelting point; Boiling point; Cloud point; Slip melting point
Data exportTo SD card or PC
Heating Rate (/min)0.1 °C – 20 °C
Min. Cooling Time (Tmax to 50 °C)5.5 min
Min. Heating Time (50 °C to Tmax)4
Number of capillaries/cups3 melting point capillaries; 2 slip melting point capillaries; 2 boiling point capillaries; 2 cloud point capillaries
PDF reportsYes
Stored Methods20
Stored results50
User ManagementMultiple Users; Password Protection; Protection of Settings
Substances in database6
Videocolor, 300 minutes
Material No.: 51142503
See details
Temperature RangeRT – 400 °C
Number of One Clicks™12 Per User
Application TypeMelting Point
Data ExportTo SD Card or PC
Heating Rate (/min)0.1 °C – 20 °C
Cooling time (300°C to 50°C)6 min
Heating time (50°C to 300°C) (min)5.5
Number of Capillaries (2)6 Melting Point Capillaries
PDF ReportsYes
Stored Methods60
Stored Results100
User ManagementMultiple Users; Password Protection; Protection of Settings
Substances in database100
Videocolor, 300 minutes
Comparison

Documentation

Brochures

Excellence Melting Point Systems
Simple, efficient, and trustworthy, MP55, MP70, MP80 and MP90 melting point systems cover a wide range of applications and specifications, from meltin...

Datasheets

MP55 Melting Point System
Simply to the point. Everything needed for the simple and automatic determination of melting point and slip melting points.
MP70 Melting Point System
Strong performance. The MP70 is the ideal choice for melting point and melting range determinations.
MP80 Melting Point System
Maximum flexibility. Optimized for diverse tasks, the MP80 offers One Click™ melting point, boiling point, cloud point and slip melting points.
MP90 Melting Point System
Efficiency at the highest level. The MP90 is optimized for the highest throughput.
LabX™ Thermal Values - Laboratory Software for Melting Point Excellence Systems
Professional PC laboratory software for MP70, MP80, and MP90
MP VPac™ Performance Verification
Performance verification by temperature calibration is the recommended workflow to ensure faultless routine operation of the melting point instrument...
Comprehensive and useful MP and DP accessories
The comprehensive and useful MP and DP accessories from METTLER TOLEDO facilitate and secure a crucial part of the melting, dropping or softening poin...
Equipment Qualification for Melting Point
Our EQPac service solution provides an onsite, fully-documented, professional installation and qualification service to ensure regulatory compliance a...

Case Studies

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In theory, the measurement of the lubricant acid or base number by titration is straightforward. In practice, however, it is a challenging task. Impro...
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Memory Card application package: Methods on memory card. Titration in the Petroleum Industry: Determine key values for quality, quickly and precisely...
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Sulfate determination. Analysis of dietary supplements: turbidimetric titration of chondroitin sulfate. Tips & Hints: How to transfer your density a...
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Services

Explore our Services - Tailored to Fit your Equipment

We support and service your measurement equipment through its entire lifecycle, from installation to preventive maintenance and calibration to equipment repair.

FAQ

What is a digital melting point apparatus?

A digital melting point instrument uses a furnace and video camera to measure the change in light transmission in relation to the measured furnace temperature for melting point detection.

This melting point measurement is done digitally, reducing operator influence considerably. Up to 6 samples can be measured simultaneously with an accuracy of down to 0.2 °C and short heating and cooling times.

With its compact size the METTLER TOLEDO melting point meter fits well on every lab bench.

How does a digital melting point apparatus work?

A METTLER TOLEDO melting point system is represented in the schematic diagram below.

Melting Point System schematic diagram
Melting Point System schematic diagram

This system is a combination of a furnace and a video camera.

Melting point is determined by heating the sample. The furnace is used to control the temperature during an analysis. Temperature control and temperature recording is guaranteed by a digital platinum temperature sensor.

The sample sits inside a glass capillary and is inserted into the furnace. During heating, when the melting occurs, the light transmission through the sample changes: When the material is solid and opaque, less light is transmitted through the substance. When a material is liquid and more transparent, more light is transmitted. This change in light transmission can easily be determined with a video camera and is therefore a reliable way of detecting the melting point of a substance.

This, in a nutshell, is what is needed for fully automatic melting point determination.

All results, measurement data and video files are stored on the melting point device and a lab report can be generated fully automatically.

Which samples can be measured with a digital melting point apparatus?

The determination of the melting point can be performed for powdered crystalline samples.

What does a melting point accessory box consist of?

For sample preparation, a dry powdery substance is ground in a mortar and filled into the capillaries, which are then inserted into the furnace. The melting point accessories box by METTLER TOLEDO contains everything needed for accurate and reproducible sample preparation.

The melting point accessory box is part of the standard delivery of the MP90 and is a highly recommended optional accessory for MP55, MP70 and MP80 instruments.

The melting point accessory boxes are available with standard or USP reference substances. The melting point accessories box contains two sets of 150 melting point capillaries each, three METTLER TOLEDO melting point reference substances or USP melting point reference standards, an agate pestle and mortar, tweezers, a spatula, and 5 capillary filling tools (Picture 1):

Picture 1: Melting point accessory box including all necessary melting point equipment for sample preparation and melting point standards for melting point tester calibration.
Picture 1: Melting point accessory box including all necessary melting point equipment for sample preparation and melting point standards for melting point tester calibration.

How do you calibrate and adjust a digital melting point apparatus?

If we want to make sure that the melting point analyzer is providing the correct results, we need to verify its measurement accuracy. As it is not possible to measure the sample temperature directly using a certified thermometer, the temperature accuracy is checked using reference substances, ideally with certified temperature values. Thus, we can compare nominal values including tolerances with actual measured values.

If calibration fails, which means if the measured temperature values do not match the range of the certified nominal values of the respective reference substances, the instrument needs to be adjusted.

The instrument should be adjusted with at least two reference substances that encompass the whole melting range required. The calibration should be performed with at least one reference substance melting point lying within the required temperature range. The new adjustment should be checked with a different reference substance than the one used for adjustment.

We highly recommended that you use METTLER TOLEDO melting point standards for calibration and adjustment purposes of MP Excellence instruments. Each melting point reference substance comes with a certificate and both nominal pharmacopeia and thermodynamic melting points written on the label. The substances are securely identified with two barcodes showing the filling code and lot number.

The following table provides an overview of METTLER TOLEDO reference substances:

Furthermore, METTLER TOLEDO offers a melting point performance verification package, called the MP VPac™, which contains prefilled and sealed capillaries for use in instrument verification.

How much substance do I have to fill in the capillary? How can I check the filling height?

The key to good results is careful and exact sample preparation. Prepare your samples so that the amount of substance is the same across all capillaries. Slight differences in the amounts could cause deviations in the measured melting point temperatures.

Check the capillary fill height using the lines marked on the melting point sample preparation tool. For accurate measurements, the optimum fill height of 3 mm should be observed.

The sample preparation tool offers many possibilities for checking the fill height of your substance. See the Fig. 1 for estimating the various fill heights.
For best results, it is important that the melted substance needs to cover the holes for transmission light detection.

Fig. 1: Sample preparation tool: fill height markings
Fig. 1: Sample preparation tool: fill height markings

Does the METTLER TOLEDO melting point apparatus support me being compliant to regulations for melting point determination such as  Ph.Eur 2.2.14,  USP chapter <741>, Japanese Pharmacopeia 2.60?

The METTLER TOLEDO melting point instruments fully comply with the following standards for melting point determination:

  • US Pharmacopeia USP <741>
  • Japanese Pharmacopeia JP 2.60
  • European Pharmacopeia Ph.Eur. 2.2.14 and 2.2.60
  • Chinese Pharmacopeia ChP 0612
  • International Pharmacopeia WHO 1.2.1
  • ASTM D1519
  • Japanese Industrial Standard JIS K0064 and K4101
  • and many more

For detailed information on international norms and standards, visit

www.mt.com/MPDP-norms

Does the METTLER TOLEDO melting point apparatus support being compliant to 21 CFR Part 11?

METTLER TOLEDO's LabX laboratory PC software for analytical instruments and balances, powers the METTLER TOLEDO Melting Point system with automated data handling, high process security and full SOP guidance.

LabX is the ultimate solution to fully integrate the data flow into other laboratory systems such as LIMS and ERP, and allows the lab to be compliant with regulations and audit ready. LabX fully supports you with software validation and compliance including 21CFR part 11, EU GMP annex 11 and ISO 17025.

What are the requirements of the pharmacopeia for melting point determination?

The pharmacopeia's requirements for melting point determination at a glance:

Use capillaries with outer diameters ranging from 1.3–1.8 mm and wall thicknesses from 0.1– 0.2 mm. Apply a constant heating rate of 1°C/min. If not otherwise stated, in most pharmacopeias temperature at the end of melting is recorded at point C when no solid substance is left (corresponds to the clear point). Pharmacopeias such as the United States Pharmacopeia (USP) require the determination of the melting range, where points A (corresponds to collapse point) and C are used for temperature determination. The recorded temperature represents the temperature of the heating stand, which can be an oil bath or a metal block, in which the thermocouple is positioned.

Is it possible to perform as well other applications than melting point determination on the METTLER TOLEDO Melting Point instruments?

All MP instruments can also measure the melting range. The instrument models MP55 and MP80 can be used for diverse tasks. With the MP55, melting and slip melting points can be determined. On the MP80, the melting point application is extended by boiling point, cloud point and slip melting point.

In detail, the METTLER TOLEDO Melting Point MP55 and MP80 System offer the possibility to perform the following applications:

Boiling point measurement:

The MP80 acts as an automatic boiling point apparatus according to the following measurement principle:  To determine the boiling point, which is the temperature at which a phase transition from liquid to gas occurs, approximately 100 µL of sample is pipetted into a glass tube. A smaller boiling point capillary is then inserted into the filled tube to prevent superheating of the liquid, which would induce boiling retardation and give rise to inaccurate readings. The sample is then inserted into the boiling point instrument, and the method is started. The temperature rises, and gas bubbles are formed within the liquid and escape to the surface. These ascending bubbles reflect the light of the built-in light source and are detected individually. The frequency of the bubbles is measured and is used as the basis for boiling point determination. Ambient pressure is measured with a built-in calibrated barometer, and compensation to sea-level pressure is automatically calculated and applied to the results.

Cloud point measurement:

The MP80 acts as an automatic cloud point apparatus according to the following measurement principle: The cloud point of a solution corresponds with the temperature above which a sample becomes turbid. Cloud point determination is typically performed with a 1% weight dilution of the substance of interest in water. Approximately 100 µL of sample is pipetted into a glass tube and inserted into the cloud point tester. The solution of interest is transparent at the beginning of the experiment, and when the cloud point is reached, the solution becomes turbid. This turbidity is monitored via transmitted light detection – the higher the temperature above the cloud point, the more turbid the solution, and thus less light transmitted through the solution. Automatic video camera detection of the decrease in transmitted light intensity is the key to obtaining repeatable and reliable cloud point results.

Slip melting point measurement:

The MP55 and MP80 act as an automatic instrument for slip melting point determination according to the following measurement principle: To determine the slip point of e.g. fats, oils and waxes, an inner slip melting point capillary tube containing a column of sample is immersed in water, which is then heated at a specific rate. The temperature at which the column of fat is observed to start rising in the inner capillary tube – due to a combination of buoyancy and the molten outside surface of the column – is recorded as the slip melting point. The slip melting point of the substance is evaluated via digital image analysis. When the column of substance starts to move upwards, the image processing algorithm determines the slip melting point fully automatically.

Free Application Notes for Melting Point
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