Table 3.
Summary of tentacle-contained cnidocyst penetration of various materials
| Material | Elastic Modulus (MPa) | Penetration |
| Gelatin | 0.02 | + |
| Polyacrylamide | 0.06 | + |
| Teflon | 0.10 | + |
| Latex | 0.80 | + |
| PDMS | 1.00 | + |
| Nitrile | 2.60 | - |
| Polyvinylchloride | 250 | - |
| Polycarbonate | 2,000 | - |
| Aluminum | 70,000 | - |
| Glass | 90,000 | - |
List of test materials and their respective elastic moduli. The ability of tentacle-contained cnidocysts from Physalia to puncture these materials is also listed. Note that the elastic modulus of human skin is approximately 0.13 MPa [35]. A positive sign denotes successful penetration of at least some of the threads in all three trials. A negative sign indicates a lack of successful penetration in all trials. In positive cases, thread penetration occurred in all three trials.