If you look on the list of patrons on the BPMA website Listawoods are a notable absentee, whereas if you look on Listawood's website they proclaim that they are a patron of BPMA.
Makes one curious about the "missing" RN coated mug test, and wonder whether it was perhaps too good to feature alongside the rest...
I don't doubt the result of the Duraglaze coating, but maybe it has an equal?
We've RN coated mugs that have been through the dishwasher hundreds of times without even beginning to show signs of the deterioration indicated in the test results, so it does make one wonder.
Another thing that I wonder about (there's a lot of wondering today!) is who developed the equivalence test, and how? Whilst commercial dishwashers may reach and pass 75°C (some more than 85°C) domestic ones are usually around 65°C, so the test isn't representative of either.