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Plastics/Material strength issues


Hexagon shaped holes
Hexagon shaped holes  
Hello Mr Tomlinson,

I want to get a part made, and I was wondering if you could offer any advice on selecting the best material. (the part will be laser cut rather than moulded, but your comment on the material choice would be much appreciated)
As you can see in the attached image, the part features a number of hexagon shaped holes which are made in a 4mm thick sheet. There is a 0.2mm distance between each hole, and I am just concerned about the possibility of these 0.2mm sections breaking when the part is handled.
Could you tell me what type of strength is relevant here? When I look at data sheets for different materials, there are a number of different types of strengths listed, but I am not sure which one I should be looking at, or what value it should be in order to be safely handled without breaking.
Any advice here and/or suggestions on the best plastic material would be most welcome.

Thank you and regards,

Hi Eddie,
I believe we have communicated before some time ago.
Regarding the selection of material for your project it will also depend on what environment and use the material is going to be subjected to along with the strength issue.
Once you have established the above you can then look again at the available materials which meet your specific criteria do not forget if the part is coming into contact with say acid or other substances which may affect the chosen polymer.
Of the top of my head I would look at trialing several materials such has polycarbonate, glass filled nylon or any of the other engineering materials rather than a commodity polymer.
Also look at the design of the part to see if you can add strength to it in some areas.



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Robert Tomlinson


Tooling design,design for manufacture,tooling procurement,machine design,machine procurement,
Processes injection moulding,injection blow moulding,extrusion blow moulding, process control,productivity improvement,Quality,Decoration,Assembly,Automation.Thin wall moulding expert.


Recent and past projects. ?Designed various closures for a new type of composite tube and assisted company in bringing the product to market one design now in use by a major high street retail group a second design is currently moving into the production phase. ?Assisted a company in procuring sheet materials for a construction project. ?Identified source of a foreign plastic body for a major manufacturer of food products. ?Outsourced the manufacture of a building product reducing the cost of manufacture by 10%. ?Provided technical assistance to a manufacturer of blank car registration plates which improved production and reduced rejects. ?Provided interim management for a manufacturer of composite GRP tubes and structures. ?Carried out commercial due diligence and technical appraisal of a manufacturer of plastic products on behalf of the buyer a major investment group. ?Provided technical assistance to a major producer of closures with a hot runner and colour change problem. ?Provided technical assistance with a problem regarding a mould tool and hot runner system processing PET. ?Carried out research and development of a patented testing system for a major pharmaceutical manufacturer. ?Designed and implemented a manufacturing cell that produced annual savings of over 35k. ?Designed and project managed a transfer system of mouldings from the point of manufacture to the warehouse that reduced labour and eliminated bottle necks. ?Increased the production of aerosol caps by 16% at a leading European manufacturer which resulted in an increase of 600k components per day. ?Invented, designed and implemented an automatic part rejection system that reduced labour and customer complaints at a closure manufacturer. ?Set up joint venture between Indian and UK manufacturer. ?Designed auto engine support mounting bracket that reduced cost of manufacture. ?Designed planned preventative maintenance system for a manufacturer that reduce downtime by 10%. ?Reduced the cost of machine spares by 10% for an injection moulding company. ?Designed an automatic water cooling evacuation system as part of a single minute exchange of die project. ?Carried out procurement of replacement plastic pump parts for a Saudi Arabian company. ?Carried out appraisal and valuation of plant for a company prior to them purchasing a company. These are only a few of the successful projects that have been undertaken by Plastic Moulding Solutions since it?s formation if you require assistance then please do not hesitate to contact us to discuss your requirements.

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