Everyone is familiar with the friendly neighborhood Spider-man's webbing: both organic as shown in Sam Raimi's Spider-man, or the Web-shooters version from every other Spider-man incarnation. My question might sound a bit of an overthinking but, exactly how strong are his webs?
According to Marvel Wikia (here), it says:
The web line's tensile strength has been estimated to be 120 pounds per square millimeter of cross section.
Well, that's one heck of a tensile strength. But in the movies and literally every version of the animated series, we see the super-villains and even super-heroes breaking off the webs so easily (In the Ultimate Spider-man animated series, even a non-super powered villain like Batroc the Leaper breaks through the webbing). But on the other hand, sometimes even the strongest guys find it difficult to break through the webbing. Why is it so? Does Spider-man carry cartridges with webbing of various (tensile) strengths?