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Gammadot Rheology is a preferred provider to the membership & clients of Rapra Ltd

Welcome to the web site of independent testing laboratory, Gammadot Rheology. Our skills and knowledge are based on over 25 years of providing rheology and materials characterisation support to the plastics and rubber industries. In addition to the many polymer-orientated characterisation projects carried out over the years, we also have experience in characterising a variety of other fluids & semi-solids including: oils, greases, bitumen binders, food stuffs / additives, pharmaceutical creams & chemical solutions. Gammadot clients range from manufacturers to end users and cover a wide spectrum of sectors including: Medical, Automotive, Aerospace, Construction and Defence.

From applying rheology to quality control, failure analysis and process optimisation issues, to providing accurate materials property data for flow simulation software packages such as Moldflow, Sigmasoft 3D & Moldex3D, Gammadot is able to offer you a variety of standard and custom solutions to all your flow and thermal properties requirements in a confidential & timely manner.

The single most important parameter in the processing of a molten polymer (or indeed, any fluid body) is the viscosity function of the material – if it doesn't flow you can't process it! This parameter is highly sensitive to material structure. Rheological measurements can detect discrete changes in structure through flow behaviour, and are therefore fast & accurate methods of providing quality control for all aspects of the process. Whether it be screening incoming raw materials to discriminate batch to batch variance, avoiding extrusion problems such as melt fracture by mapping the critical shear stresses at which the phenomena occurs, or determining thermal degradation in failed components caused by inadequate drying of material / excessive thermal history within the process, Gammadot has a rheometer able to provide this information in a fast & reproducible manner.

Modern flow simulation software packages such as Moldflow and Sigmasoft 3D provide highly accurate models of the injection moulding process, but without the use of equally accurate material properties data, they are worthless – the old adage ‘rubbish in, rubbish out‘ holds true in process simulation. For this reason Gammadot offers comprehensive materials characterisation services supporting all of today’s leading packages at extremely attractive prices. Click HERE for more information on testing services.

With ever increasing costs of raw feedstock, and processors under pressure to use more recycled materials in product manufacture, the importance of controlling & optimising today’s production processes is paramount. Key to minimising component reject rates is guaranteeing consistent material batches enter the production stream. Gammadot has many years experience tailoring quality control programmes to suit specific customer needs and therefore ensuring quality product by discriminating out of spec. materials offline. Read a past presentation HERE.

Rheological measurements play a key part in many plastics failure analysis projects, as techniques such as oscillatory rheometry are highly sensitive to changes in a materials structure and therefore can give first indications of failure cause: be it degradation due to inadequate drying of materials prior to processing, excessive thermal / shear history during conversion, the effects of service environment, or simply the wrong grade of material has been introduced into the process – oscillatory rheometry is an excellent first step towards solving the problem.

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Click above to read the latest news relating to Gammadot Services, projects & planned research programmes.
Our free information resources including thermoplastic & rubber properties databases and injection moulding troubleshooter guide.
Click here to request access to the Gammadot secure download area.
Second order viscosity model node point conversion & data calculation - download & try it out today!

The British Society of Rheology
Gammadot Rheology will guarantee a 24 hour express service on testing for a small surcharge (Assuming the test type & sample batch size allows this).
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The Federation of Small Businesses The Oil & Colour Chemists Association The British Society of Rheology The Telford Polymer Association