: Ranges between 150–300 mPa.s at 25°C, ensuring high flowability during processing.
| Feature | Details | |---------|---------| | Line width | 0.1 mm (ISO standard) | | Nib material | Hardened stainless steel or tungsten carbide (depending on production year) | | Ink type | India ink (waterproof, pigmented) | | Ink feed system | Capillary action with an internal wire and weighted regulator | | Refillable | Yes (via cartridge or eyedropper into the barrel) | | Body material | Plastic (polycarbonate-like) with metal grip section | | Cap type | Screw-on, airtight with integrated sealing wire | | Compatible ink | Rotring/Isorex drawing inks (black, white, colored) |
Large centrifugal pumps require consistent torque delivery. However, fluid dynamics can create hydraulic shocks. The R310 1 coupling dampens these hydraulic pulsations, ensuring the pump shaft remains stable, thereby reducing maintenance cycles on the pump seals.