The PNR 12 measures the resistance a material provides against being pierced by a specifically shaped test body.
The USP (US Pharmacopeia) describes the consistency measurement by penetration method for microcrystalline wax, white petrolatum and carboxymethylcellulose sodium paste.
Download the full application report to see an example on how to measure white petrolatum.
Water Sector Talent Exodus Could Cripple The Sector
Well let´s do a little experiment. My last (10.4.25) half-yearly water/waste water bill from Severn Trent was £98.29. How much does not-for-profit Dŵr...