Like the gravimetric analysis, the Soluble Fraction test is aimed at measuring the soluble/amorphous fraction of polypropylene and ethylene-propylene copolymers.
The quantity of amorphous fraction has a significant influence on the properties and performance of PP resins, so its analysis is fundamental for Quality Control of polypropylene production.
The soluble fraction measurement is performed by CRYSTEX, which is an automated method based on the TREF crystallization technique.
The results provided by CRYSTEX are equivalent to the Xylene Solubles results obtained with the gravimetric method (ISO 6427, Annex B). A study conducted by Polymer Char with a broad selection of PP resins shows an excellent correlation between CRYSTEX and the gravimetric method, while obtaining better reproducibility and precision thanks to the full automation of CRYSTEX.
In addition to measuring the amorphous or soluble fraction percentage, CRYSTEX also quantifies the ethylene content and intrinsic viscosity in the original sample, and in the amorphous and crystalline fractions.
The following are some results of analyses performed by either CRYSTEX® QC or CRYSTEX® 42:
An infrared detector is used to measure the quantity of soluble/amorphous fraction.
The infrared detector also has a composition sensor that can measure the ethylene content in the whole sample, in the crystalline fraction, and in the amorphous fraction.
The intrinsic viscosity value of the whole sample and of the amorphous and crystalline fractions can be obtained by using a viscometer detector incorporated into the CRYSTEX Instruments.
To calculate the final cost, please use the base amount (‘Soluble Fraction’ in this case) and then add the corresponding amount for any additional results or services that you want to include.
|CRYSTEX QC/42 (Price/Sample)||First Sample||Additional Samples|
|Calibration for Ethylene Content||186€||0€|
|Calibration for Intrinsic Viscosity||109€||0€|
|Minimum sample amount CRYSTEX QC||>3 g|
|Minimum sample amount CRYSTEX 42||>1 g|
The fractionation service is available thanks to the Instruments PREP mc2 and PREP C20, capable of fractionating samples by molecular weight or by composition (TREF or CRYSTAF). Please visit the link Preparative Fractionation for more information.
The resulting fractions are later analyzed by the corresponding technique (GPC or TREF/CRYSTAF) to check the good performance of the fractionation process. Finally, the physical fractions are sent back to the customer by courier service as well as the analysis results of the fractions, so the customer can check the separation.
An Excel report with a summary of the results and averages is sent. The report contains the soluble fraction results and their equivalent in Xylene, but it also shows the C2 content and IV for the whole sample, and the soluble and crystalline fractions. If you have any question about the information sent, contact firstname.lastname@example.org
Please send an email to email@example.com and we will be pleased to help you.
To order any analytical service, please fill in the Analytical Service Request Form. Provide all the information available about the samples to be analyzed. Sent forms will be processed as formal orders for Polymer Char records. All the information provided is considered confidential information.
If a previous quotation is required, please do not hesitate to let us know by sending an email to firstname.lastname@example.org
Samples should be shipped to:
Polymer Characterization S.A.
Valencia Technology Park
Gustave Eiffel 8
Attn.: Analytical Services Department
We highly recommend to use courier service instead of post mail to ensure your samples arrive in good condition.
You will receive the results in less than a week. If you plan to send more than 10 samples, please check with our lab, as the response time may be longer in this case.
This time is approximate, and it depends on the service queue in the laboratory at the time of the order. Polymer Char will inform the customer if the turnaround time is expected to be longer.
Please refer to our Analytical Services Terms and in the first chapter, you will find the necessary amount for each technique.
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