I've enjoyed reading all of your posts in this thread
@ahkahn. I'm curious if you have any information about testing for "new car smell" and/or chemical off gassing associated with the different interior materials we find in cars. I am particularly interested in learning if there are any interior materials developed with specific emphasis and focus on minimizing the chemical off gassing (and what off gassing there is, happens quickly and thoroughly).
Our own experience is that we have wicked chemical sensitivities. We've found that our Roadster, with leather interior, had fully off gassed and was usable for both of us at only a couple of years of age. So we intentionally chose a leather interior for the Model X we're hoping to pick up next week.
With the current Model X interiors, our experience was that they had a strong new car smell, but we could manage it and we think off gas it over the next few months to a year (leather that is).
The one ultrawhite Model X - the composition of it's new car smell was enough different that we couldn't sit in it for any length of time, and after initial exposure, didn't want to approach the car even with doors and windows closed. Then again, every person with chemical sensitivities is different (we know that), and a nasty chemical that off gasses fast and thoroughly is far preferable to something that will steadily off gas a little bit for decades.
I appreciate any help, pointers, or links you can provide. Heck - if there's a material that's optimized to be chemicallyl neutral / inert, if I knew what it was, I'd investigate that and look at changing over the interior.
Great topic twist. So, there are a few points on this that I can touch on. I'll disclaimer this with the fact that I'm not a chemical engineer, nor do I really work with them at the vinyl manufacturers or leather tanneries that I work with, but I'll talk about the parts I'm familiar with.
First off, the other main purpose of the topcoats used on leather and vinyl (in addition to abrasion protection) is protection against outgassing. The topcoat is possible to remove using a harsh cleaner, so when this happens, the plasticizers (in vinyl) will migrate out, as well as the other treatments added. The role of the plasticizers in a PVC vinyl are to soften the material. Once those come out of the material, the material will eventually become brittle and crack. Where do the plasticizers go? Onto the windshield (foggy film), etc. So, by effectively removing the topcoat (through using a harsh cleaner or conditioner) you will remove the topcoat and accelerate the outgassing.
Secondly, the new car smell isn't strictly because of the outgassing. Most of the "smell" is due to the adhesives, lubricants (silicones), and other chemicals used in the manufacturing of the components. I'd venture to say that the actual seating material is only a minor contributor to the smell, as the headliner material, adhesive, carpeting, carpet adhesive, foam, and other components are all contributing factors. Changing the material won't have much effect.
A new trend that is emerging in the vinyl manufacturing world is the BPA free, Phalate free, and flame treatment free vinyls. This has not yet come over to the automotive world, yet, but reducing chemicals used has become "a thing". It's right now growing in the commercial markets (restaurants, hotels, etc), and will probably hit the automotive market in the next few years.
The polyurethanes are much more forgiving when it comes to the outgassing and chemicals. They're made completely differently, so, to the best of my knowledge, outgassing is not really an issue with these materials (the Ultra white interior). But, keep in mind, there is plenty of other PVC in the car... door panels, dash, etc.
I'm amazed that no one cares about how many Naugas have to give their lives so that you can have Naugahyde seat covers. It takes many more Naugas than it does cows to put seats in your car.
They do it willingly, and they don't die. Just shed their skin and start over.
No matter the leather debate, Tesla does not have the best seat materials and not even great ones. They are far behind the curve on seats.
I'm in the fabric business. Please educate me on what, if you were in charge, would use as "the best seat materials".