| 264 / | HD | PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES |
| 500 | DF | DIRECT APPLICATION OF FLUID PRESSURE DIFFERENTIAL TO PERMANENTLY SHAPE, DISTORT, OR SUSTAIN WORK {14} |
| 510 | DF | .~ Producing multilayer work or article {2} |
| 512 | DF | .~.~ Producing hollow work or a tubular article {3} |
| 514 | | .~.~.~ Including extrusion {1} |
| 515 | DF | .~.~.~.~> Including forming a hollow article |