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Originally Posted by Celestialsailor  Here is another sight with actual scientific numbers.
Please note Tensile Strength:- Acrylic 10,000PSI Poly 10,5ooPSI
Impact strength:- Acrylic .9NI Poly 13.0NI
Elongation:- Acrylic 5% Poly 100% |
Thanks for posting those mechanical characteristics, they corroborate exactly what I have been saying. Similar tensile strength, elongation of polycarbonate 100% versus Acrylic 5% and polycarbonate has high resistance to impact (that due to its elasticity and flexibility).
I normally find I don't need to make anything of my credentials but as they have been challenged, some of my experience includes:- Chief Executive Officer of a company providing regulatory surveys, management systems and other services for customer fleets comprising over 3,000 commercial vessels from very small up to around 150 foot (including the likes of charter sail boats and power boats), occasional overview of quality of build or of refit of super yachts for an international financier (for vessels he is exposed to in his loan book), advice regarding the operation and design of high quality, high performance commercial vessels (mainly high powered water jet powered fast ferries, 80 - 130 foot approx) and especially with managing the design of those vessels through their classification society design appraisal process, the project management of the build and entering into service of those vessels, management of inspectors and non exclusive surveyors representing classification societies and the flag administrations of a number of countries, etc, etc. That experience has been international. I have also been associated with pleasure vessels (sail and power) for over 50 years, but I am the first to concede that experience in the pleasure world does not necessarily indicate merit as ones only customer is oneself and errors are ones own
.
As I have said, for pleasure vessels one can use whatever one likes - if one wants to use polycarbonate or plain or laminated glass for windows and hatches and one is confident that one understands ones particular application of them then go for it. They may work for you and they may not, I have just tried to point out the issues with them and how the regulatory/class world regards them.
I can only relate how the professional marine world I have worked in uses or does not use materials and why. Maybe some will place some consideration on what I have said and maybe not. Of course most (whose credentials I have no knowledge of
) are saying quite clearly that they discard it. So, I don't think there is really anything else I can add in this forum, and after all I'd rather be doing this for pay than for angst
. Adieu.