application Suction and delivery hose for concrete, sand, gravel and general abrasive materials. ABRACORR-FRA can be supplied equipped with UNI 2277 PN10 split flanges tube STD: Black, smooth, NR/SBR antistatic rubber compound (R<106 Ohm/m) SPEC 1: Brown, smooth, NR rubber compound (ideal for stones and gravels) SPEC 2: White, smooth, NR FDA approved rubber compound SPEC 3: Black, smooth, EPDM antistatic rubber compound reinforcement High strength synthetic plies, with steel wire spirals and 1 copper wire for hose grounding cover Black, corrugated, antistatic (R<106 Ohm/m) cloth impression CR rubber compound, abrasion and weather resistant working temperature -40°F + 158°F specifications DIN 53516 50 ± 5mm3