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John Gearing
Specialities
Materials and Design
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Processing |
Secondary Operations
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Commercial |
Markets |
Other Skills |
The 3 main specialisation areas are:
For checking the THERMAL INSULATION properties of your plastic materials and composites, John Gearing offers a rapid and accurate service to BS874/ISO8301 for measuring the K - or lambda - values. Thickness from 100mm to 10mm - which could be several thinner sheets stacked up and results usually within several days. Using exclusively LaserComp Inc apparatus and results traceable to NIST (usa) standards.
DMA (Dynamic Mechanical Analysis) will give you the glass transition (softening point) and the relative stiffness (modulus) and damping from very low temperatures to 400ºC. These can vary with the vibration frequency and also the strain amplitude, and DMA shows this! As well as the normal bar-shaped sample, we can handle thin films, fibres and now POWDERS.
It is also over 1000 times as sensitive as DSC for a few milligrams of powders. Examples can be seen of lactose - 4 samples of which were prepared differently and the DSC showed no differences, yet DMA shows very clear ones.
Polymer calibration standards for GPC or Maldi-TOFS etc. where you wish to have a highly characterised few grams of research material of known molecular weight and polydispersity.
The polydispersity is usually very narrow, although some materials which are prepared by fractionation are rather broader!
John Gearing MA (engineering science), author of chapter on DMA in Marcel Dekkers latest book on "Handbook of Polymer Testing" - Ed Roger Brown, 1999. 5 years experience of thermal conductivity testing throughout the UK on gooey liquids and mastics through to rigid plastics or composite samples as well as the common vacuum panels and foamed plastics. 27 years experience in GPC with a particular interest in producing very narrow (low polydispersity) polymer standards through living ionic polymerisation or in the case of nylon or PVC through prep GPC fractionation.
www.gearingscientific.net
Contact Address
Gearing Scientific Ltd., 1 Ashwell Street, Ashwell, Herts. SG7 5QF
Tel: 01462 742 007Fax: 01462 742 565
e-mail: gearingsci@yahoo.com
Web: www.gearingscientific.net