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Gammadot
Rheology Testing & Consultancy Services
Unit
5C, Leaton Industrial Estate, Bomere Heath. Shrewsbury. Shropshire.
SY4 3AP. UK
Tel: +44 (0)1939 291677 ...Email: enquiries@gammadot.com
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Gammadot
Rheology Bi-Annual Newsletter - March 2018 |
Welcome
to the latest Gammadot Rheology newsletter.
This month sees the company celebrate 12 years
providing rheology & material characterisation
services to UK & international clients. As
in previous year celebrations, we've dropped our
prices on certain testing so scroll down the page
and see the savings you can make today! |
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Capillary
Rheometry
- 2018 is the ACR2100 capillary rheometer's 10th year of
service and up until the supply and recent commissioning
of the Porpoise P9 twin bore capillary rheometer, (below),
was the primary method of generating high shear viscosity
data here at Gammadot Rheology. Although now superceded
by the P9, the ACR2100 is still used regularly for the measurement
of No Flow Temperature (for deriving transition temperatures
when they are unable to be determined from DSC), Melt Density
to ASTM D3835 and shear viscometry on difficult to process
materials.
The new Porpoise P9 twin bore capillary rheometer has been
utilised for a number of projects recently producing shear
viscosity data for use in flow simulation software including
Autodesk Moldflow & Moldex 3D. It has also been useful
in providing quality control data on rubber compounds to
ensure they are within process spec. The IntelliRheo™
software accurately calculates shear & extensional data
and produces easy to manipulate output files allowing fast
processing & review of data.
Gammadot
Rheology Service Flyer Download
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Rotational
Rheometry
- As always, Failure analysis support has been a major
part of our rotational rheometry services this past year.
A rotational rheometer run in oscillation mode is a highly
accurate way of determining discrete (and not so discrete!)
changes in Mw & MwD caused by degradation leading
to chain scisson / cross linking of the polymer. Chain
scisson (whether it be from inadequate drying, or poor
thermal / shear optimisation of the process) can lead
to brittle failure in service and rotational rheometry
of 'good' & 'bad' product (and virgin granules as
a control if available) is a great way of determining
this.
Another major application of our StressTech HR high resolution
rotational rheometer is the production of 'Reactive Viscosity'
data for use in Autodesk Moldflow thermoset flow &
cure simulations using a disposable plate measuring system.
Uncured thermoset material is tested at three constant
frequencies as a function of three different heating rates.
As the test progresses the sample cures and the resultant
change in viscosity as cure progresses is captured. This
family of 9 curves is then mathematically analysed and
model parameters produced to describe the flow/cure behaviour. |
Failure of PC Product due to inadequate drying
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POM Production Problems due to wrong Grade
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Reactive
Viscosity Measurements - Adhesive
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Cure
Kinetics of PU @ Room Temperature
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Rubber
quality control - testing was carried out on
the re-instrumented R100 oscillating Die Rheometer (ODR),
checking the cure characteristics of Nitrile compounds
shipped in from abroad to ensure no cure had occurred
during transit. Gammadot's R100 has refurbished digital
temperature control and bespoke data-logging & analysis
software.
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Out
of Spec. Batch Control - The Melt Flow Rate apparatus
was utilised to discriminate out of spec. batches of material
for a client by screening out samples with excessive flow
rate values. |
PvT
Testing - A number of rubber samples (both uncured
& cured) were run over the course of two weeks. The
provision of PvT data (specific volume as a function of
pressure & temperature) is a key part of Gammadot
Rheology's flow simulation software support services -
providing data for use in Autodesk Moldflow, Moldex 3D
& Sigmasoft 3D.
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Compression Moulding Test Specimens -
A standard set of rubber test samples and sheets for stamping
test specimens out of. The various specimens are required
to perform a full Moldflow rubber characterisation.
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Flow
simulation Data - Mark Edwards, Gammadot Rheology's
owner and principal scientist, has been involved in supplying
material characterisation data for flow simulation packages
since 1989. As well as supplying data for use in Autodesk
Moldflow simulation of thermoplastics, rubbers & thermosets,
Gammadot Rheology can also provide data for other packages
such as Moldex 3D & Sigmasoft 3D.
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Key
Gammadot Test Services
Melt
Flow Rate
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Rotational
Rheometry |
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Melt
Flow Rate (Index) / Melt Volume Rate - MFR
(MFI) / MVR to ISO standard 1133 or ASTM D1238. Full suite
of weights and both standard and half sized capillary dies
available. |
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Rotational
Rheometry - Shear viscosity
versus shear rate / Time / Temperature • Oscillatory
Rheometry as a function of Frequency / Time / Temperature
• Cure Kinetics / Melt Stability / Thermal Degradation
Studies
to ASTM standard D4440. |
ODR
Rubber Rheometry |
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Capillary
Rheometry |
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Rubber
Cure Rheometry - With
uprated temperature control and datalogging system. Cure Kinetics
to ISO standard 3417 or ASTM 2084. |
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Capillary
Rheometry - Shear viscosity as a function of shear
rate • Extensional viscosity as a function of extension
rate • Melt Density to ISO standard 11443 or ASTM D3835. |
P.v.T.
Behaviour |
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Brookfield
Viscometry |
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High
Pressure Dilatometry (PvT Behaviour) - Specific Volume
or Density as a function of temperature & pressure. |
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Brookfield
Viscometry - LV & RV viscometer ranges available
• Full range of RV / LV spindles plus Small Sample Adaptor
(SSA) • UL Adaptor for accurate low viscosity measurements. |
Check
out our other testing services too - A variety of thermal
& mechanical testing methods are available on request.
Also, further savings can be made with volume test discounts:
6 - 10 tests = 10% discount, 11 to 15 tests = 15% discount
& 16+ tests = 25% discount! |
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For
further information about Gammadot Rheology's testing & consultancy
services, or if you have a specific problem / testing requirement
which you would like Gammadot to provide a solution to, please
contact us using the details at the top of the page or via the
enquiry form HERE.
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have received this newsletter as a past customer, contact or because
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