Full definition
A solid extruded elastomer profile with a circular cross-section, used as a versatile sealing element for static applications where standard O-rings are not available in the required size, or for custom-length seals that are cut and joined in the field. Available diameters: 1.5-50 mm (standard stock), with custom sizes available. Materials: silicone VMQ (-60 to +230°C, FDA food-grade available), neoprene CR (oil + weather resistance, -35 to +100°C), EPDM (weather + steam resistance, -50 to +150°C), nitrile NBR (oil + fuel resistance, -30 to +100°C), FKM/Viton (chemical + high-temperature resistance, -20 to +200°C), and sponge/foam cord (compression sealing). Ends are joined by butt-splicing with cyanoacrylate or vulcanizing cement to form custom-diameter O-rings. Tolerance: ±0.15-0.25 mm on diameter. Sold by the meter or spool (typically 10-100 m). Per ASTM D2000 for material classification. Applications: tank lids, manhole covers, flanges, oven doors, and any non-standard sealing groove where pre-made O-rings are unavailable. Must account for approximately 5% joint efficiency loss at the splice point.