NGP 524 Graphitic Yarn NGP 524 yarn end rings are designed to prevent extrusion of the 6300J flexible graphite. Style 524 is braided at NGP to exact tolerances and uniform density. Nuclear Graphite Products (NGP) Main Page NGP 524 Graphitic Yarn Page NGP 6300J Flexible Graphite Seal Rings Page NGP Belleville Spring Washers Page NGP 193 B-7 Gland Studs Page NGP Style 6350 Graphite Lubrication Page NGP 6000 Composite End Rings Page NGP 5005 Graphite Spacer Bushings Page