Synthetic Webbing

After gaining his spider powers, Peter developed this Synthetic Webbing to aid him in the field. According to Tony Stark, the tensile strength is "off the charts" (being the only part of Peter's homemade costume that he didn't mock), and as stated by himself, it lasts for 2 hours before dissolving.

Trivia

 * In Spider-Man: Homecoming, it is revealed that Peter is capable of making the fluid using chemicals that can be found in an average high school chemistry lab.