Service: Condensed chemical resistance for keyboards covered with silicone

Chemical resistance according to DIN 42115
In a departure from DIN 42115, the reaction time was extended to a period of 24 h. The assessment took place directly after chemical residue was removed and was then repeated after 24 h.


	Substance	CAS-Number*	Resistance
Organic solvents	Acetone	67-64-1	Resistant
	Ethanol	64-17-5	Resistant
	Isopropanol	67-63-0	Resistant with some restrictions
	Loesol 80 (90-100% hydrocarbons, naphta)	64742-49-0	Non-resistant
	Methyl-ethyl-keton	78-93-3	Resistant with some restrictions
	White spirit	N/A	Non-resistant

Inorganic solvents	Cellulose thinner	N/A	Non-resistant
	Screen cleaner	N/A	Non-resistant
	Thinning agent	N/A	Non-resistant

Acids	Acetic acid 5%	64-19-7	Resistant
	Phosphoric acid 10%	7664-38-2	Resistant
	Sulphuric acid 10%	7664-93-9	Resistant

Other substances and mixtures	Ammonia	7664-41-7	Resistant
	Vinegar-based cleaner; ingredients/100g <5% anionic tensides	N/A	Resistant
	Machine oils	N/A	tba
	Potash	584-08-7	Resistant
	Sweat	N/A	tba
	Soda	N/A	tba
	Hydrogen peroxide 12%	7722-84-1	Resistant
	Bleach**	N/A	Resistant

LABS test	White spirit: cellulose thinner: methyl-ethyl-ketone	N/A	Non-resistant

* Chemical Abstracts Service Registry Number, see www.cas.org
** We tested selected products

"Resistant"	No change after exposure to the chemical

"Resistant with some restrictions"	Slight, insignificant changes after exposure to the chemical without any impairment of functions

"Non-resistant"	A significant change after exposure to the chemical with or without impairment of funtions