Hi mattress strain,
Welcome to the Mattress Forum! … and you are certainly taking on quite a research project that I hope is “worth it” to you 
[quote]In fact there was VOC outgassing present such as formaldehyde. It was all below the safety limits for the tests, but I will have to look closer at the amounts.
I have read advice on this forum that if it is made by the Dunlop process it should be safe, and also if a product is tested and certified by Oeko-Tex, Greenguard, Eco INSTITUT, it should be safe.
I would like to point out that neither of these pieces of advice means that the latex is totally absent of carcinogenic VOC’s.[/quote]
While there can certainly be exceptions to anything and there can be some people that can be sensitive to a material or ingredient (even in small amounts) that the large majority of people would be fine with … for the most part all of the latex you are likely to encounter (either Dunlop or Talalay that is made with either natural or synthetic rubber or a blend of both) will have a reliable certification such as Oeko-Tex, Eco-Institut, or Greenguard Gold and based on actual testing I would consider any type or blend of latex to be a very “safe” material in terms of harmful substances and VOC’s.
Of course as you pointed out a certification only confirms that a material meets the testing limits of the certification and not that there are absolutely no harmful substances or VOC’s that can be measured.
While it may not be as detailed as you wish … there is also a lot more information in post #2 here and the more detailed posts and information it links to about safe, natural, organic, “chemical free”, and “green” mattresses and mattress materials that can help you sort through some of the marketing information and terminology that you will encounter in the industry and can help you differentiate between them and answer “how safe is safe enough for me” and that can help you decide on the type of materials and components you are most comfortable having in your mattress or on the certifications for harmful substances and VOC’s that may be important to you. These types of issues are complex and are generally specific to each person and their individual sensitivities, circumstances, criteria, beliefs, and lifestyle choices.
There is also some information about the different levels of organic certifications in post #2 here and some of the benefits of an organic certification in post #3 here and there is more about the different types of organic and safety certifications in post #2 here and more about some of the differences between organic and safety certifications in post #2 here that may also be helpful.
[quote]I even read here that certipur tests latex.
This is not true according to the Certipur website FAQ page.
certipur.us/faq/
A: The CertiPUR-US® program only certifies flexible polyurethane foam for bedding products and upholstered furniture. Latex foam is outside the scope of our certification. It is possible for a manufacturer to include a layer of latex in a mattress that contains certified polyurethane foam. In this case, as long as the flexible polyurethane foam is certified, the manufacturer would be allowed to use the CertiPUR-US® seal. You should contact the mattress manufacturer to ask if your model contains latex.[/quote]
You are right that CertiPUR Us only tests polyfoam and memory foam and as you know whoever wrote that they also tested latex was incorrect. I would normally correct a member that posted this in my reply but I may have missed it.
Good luck in your quest and I hope you find all the information you are looking for and that is important to you
Phoenix