Robert M wrote:
PeterB,

You might enjoy reading these:







Robert

Robert M wrote:
"I contacted the manufacturer (Edwards-Councilor Co., Inc) they said they are in the process of getting EPA approval but were recommending 800 ppm (4 tablets) against COVID-19. I did not ask about contact time, however their other virucide labeling on their liquid steramine product indicates 625 ppm with a 10 min contact time against other pathogens, so it’s probably at least 10 minutes. They also said in a closed spray bottle the diluted steramine is good until it is gone, however in a wash sink or bucket it should be changed daily."

"The Restaurant Store \"Policies\ wrote:
The Restaurant Store ships the majority of its products via FedEx/UPS, however, for certain large and heavy items, a common carrier freight service is used. Common carrier items are noted in your shopping cart.

Shipping charges for common carrier and FedEx/UPS items are calculated by factoring in the weight, dimensions, and shipping distance. Our shipping calculator is linked live with FedEx/UPS so we charge their list rates to ship the items to your location.

d4 wrote:
[quote=neophyte]
It's a complex interplay of lipid bilayer intercalating/disrupting ability versus persistence. Alcohol sanitizers (above 70% alcohol concentrations) will immediately disrupt the integrity of the viral (or bacterial) lipid bilayers and thus disrupt the presentation of lipid bilayer-imbedded proteins responsible for attachment to cells and subsequent infection (or in the case of bacteria - disrupt cellular integrity and internal structures and allow leakage of vital internal fluids and ions). Then the alcohol evaporates, and carries away the water in the bacteria or virus, thus dessicating them.

Quaternary ammonium compounds, like myristalkonium chloride in Barbacide, act the same way, but are at much lower concentration in the solvent (water), and thus take longer to build up to an effective level in the lipid bilayer. Hence the instruction to allow adequate time, without rinsing, to insure the full germicidal effect. As the solvent evaporates, the effective concentration rises, as does the germicidal activity.

In general, quaternary ammonium compounds are quite stable in water. For example, Lysol has a shelf life of about 2 years, although it has other ingredients that may protect it from contamination with microbes after it is opened. I think it is that contamination that reduces germicidal effectiveness over time, rather than chemical instability of the active ingredient.