Chain quality / application criteria

Chain qualities
Tempered chains	RT	preferably for use in manual hoists like pulleys and ratchets
Rust- and acid-resistant chains	RSA	application in electric or manual hoists.
Rust- and acid-resistant chains	RPA	application in electric or manual hoists.

Application criteria
	RT	RSA	RPA
Electric hoists	(X)	X	X
Pneumatic / hydraulic hoists	(X)	X	X
Pneumatic / hydraulic hoists		X	X
Explosion-safe application / offshore	(X)1	X	X
Chemical applications		X	X
Chemical applications	X
Chemical applications	(X)2
Stationary lifting devices	X	(X)	(X)
Stationary lifting devices	X	X	X
Submerged use		X	X
Application in salt water, in the splash zone and in saline atmospheres	(X)3	(X)1	(X)1
1: only after consultation with RUD 2: acc. to agreement with the employer's liability insurance association 3: Contact of high tensile case-hardened chains with saline media will lead to corrosion by immersion or repeated moistening and air-drying. In extreme conditions hydrogen can be absorbed at the chain surface and diffuse into the metallic structure. As a result hydrogen-induced embrittlement or fissures are to be expected. Applications of this kind require special know-how regarding chain selection. A consultation with the manufacturer is essential.

Prerequisite for the RUD special qualities is the compliance with DIN EN 818-7, DIN 685 and DIN 5684.