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Hi - I have come across a notation for composite laminate sequence / layup that I am not used to - can anyone help? I am used to seeing for example [0,45,90]s but I have just read [0, 45, 90]so - is anyone familiar with this difference and what it means?

If your application can stand the extra weight, you can machine small holes through the core. This allows the flow fronts to be linked and usually prevents uneven flow. If you have a very low viscosity and long pot life you may be fine anyway - unless the fabric stacks are significantly...

I am working on a project which requires a high strength and high elongation wire for which I have chosen 316 SS. The choice was based on properties given by MatWeb which shows a UTS of 689MPa and an elongation of 50% for a wire diameter of 1.6mm. My problem is that the heat treatment they...

Hi, Does anyone know where I can source resins with a tunable refractive index, or with specific values of 1.52 and 1.78 (at Sodium D line). Ideally I would like a low viscosity thermoset but I could live with a thermoplastic if necessary. Thanks

Hi, Does anyone know where I could source a resin system with a tunable refractive index. I need two materials, one at 1.52 and one at 1.78. Ideally I would like an infusable thermoset system (ie low processing viscosity), but I could live with a thermoplastic if necessary. Thanks

Hi, Does anyone know of a good reference on-line for composite sandwich panel design. I'm particularly interested in determining I and E values for different skin thciknesses and core dimensions. I am also interested in jointing concepts for sandwich panels and would be grateful for any case...

Dear all, Can anyone tell me if there is likely to be a problem with curing an epoxy prepreg onto a PU foam, in terms of chemical compatibility? We are having some problems achieving full cure of the prepreg and I'm not sure whether or not this is due to some kind of reaction / leaching effect -...

Hi, I have had a query regarding the feasibility of making large areas of structural foam on board a ship, and disposing of it again (or at least significantly reducing the bulk of it). I've had a look at the possibility of PU foam as it lends itself to the manufacturing side at least - has...

Does anybody know how to measure the refractive index of a glass fibre (e-glass/s-glass etc)? I can get the range of liquids I need but I can't find any information on the technique itself. Grateful for any help/direction

Does anyone know how to measure the refractive index of a glass fibre (e-glass/s-glass etc)? I know how to source the refractive index matching liquids in a range of tiny bottles - but what do I do with them then? (literature seems to talk about GRIM technique - but no info. available)...

Does anyone know of a good source of information on the structure of UAV's? I'm doing a review on composite usage in UAVs and can't seem to find any specific information on materials and fabrication methods. I'm particularly looking at operational/surveillance sizes (eg Phoenix), but back-pack...

Try QinetiQ (used to be DERA). Call 01252 392638 and just ask about test facilities

Hi, Does anyone have any information on the 'stitchability' of foam cores? I'm looking to stitch through fabric and slab core - but need to establish criteria for foam selection (probably looking at a phenolic) Thanks

Hi, Does anyone know of a clear / transparent structural resin system that I can cast or infuse? It needs to have a fairly low viscosity, and preferably be room temp. cure. (with the ability to post cure up the Tg) Thanks in advance for your help