For example, the sample is chemically etched using the chromium oxide solution ([B.sub.3]), followed by the alkaline activation ([C.sub.3]), and then the copper immersion coating is performed in the 3.3 M hydrofluoric
acid bath ([A.sub.2]) with a sonication time of 10 min ([D.sub.4]) from the beginning of the immersion coating process.
Aggressive and hazardous chemicals such as nitric or hydrofluoric
acid can permeate PFA, FEP, and even PTFE primary tubing over time.
Minimalism was ascendant as Wilmarth came of age, and, after spending the late '60s as assistant to Tony Smith, he began to make sculpture from square and rectangular panes of glass, etching an expressive surface with hydrofluoric
It can be coated, but the standard processes of anodizing involving (typically) chromic, hydrofluoric
, or phosphoric acid offer limited protection, at high environmental cost.
Lights from the factories seem to blaze through the hellish mist, and the lemony taste of sulfuric and hydrofluoric
acid leaves the lips tingling with a slight burning sensation.
If a silicon chip is treated with hydrofluoric
acid in a controlled way, it becomes etched with millions of tiny pores and channels.
The [beta]-TCP ([beta]-[Ca.sub.3][(P[O.sub.4]).sub.2] powder was dispersed in distilled water and the aqueous solution with or without hydrofluoric
acid addition was exposed to microwave radiation of 2.45 GHz for various times ranging from 5 to 40 minutes.
For removing stubborn silica or sulfate scales, a 2% hydrofluoric
(HF) acid solution is useful.
For example, a common rust-remover contains HF (hydrofluoric
acid), which destroys human tissue and bone upon contact.
Within minutes the young man died, and only later did the staff figure out it was hydrofluoric
acid that had seeped into his bloodstream and caused cardiac arrest.
The active ingredient was hydrofluoric
acid (hydrogen fluoride dissolved in water), one of the most dangerous chemicals you can ever encounter.
The 49-year-old man, from Sutton Coldfield, is believed to have been injured as he added a diluting powder to a vat of concentrated hydrofluoric
acid , used for cleaning platinum, at Plataurum Design Limited, Hylton Street in the city's Jewellery Quarter.