(dub) 5 : Steam Gorilla -

: Senku creates a primitive but powerful composite material by layering paper and coating it with liquid plastic (formulated from coal tar and other chemicals).

Watch the Science Kingdom build and test their technological marvel in this clip: (Dub) 5 : Steam Gorilla

: The resulting material is incredibly tough. In a demonstration, Kinro attempts to pierce a paper shield with his spear, only for the spear to shatter upon impact. : Senku creates a primitive but powerful composite

: The paper-shields serve as lightweight, bullet-resistant (or spear-resistant) armor for the vehicle, allowing the Science Kingdom to charge into Tsukasa's territory for the rescue of Chrome. : The paper-shields serve as lightweight

In the context of the anime , the "paper" referred to in the episode titled " Steam Gorilla " (Season 2, Episode 5) is Carbon Fiber Reinforced Plastic (CFRP) , or more specifically, hardened paper armor .