The safety ladders for special applications (chemical and pharmaceutical industries, power stations, gasworks and waterworks). Stiles and rungs (30 mm × 30 mm) made from glass-fibre-reinforced plastic for particularly high chemical resistance. GRP ladders to DIN 53 387 and 53 453 (will last for 10 years). Tested as an access ladder to DIN IEC 78/221 A/CD, category 1/30 KV. VDE tested for working on live parts (1000 V a.c., 1500 V d.c.).