This　paper　presents　the　results　of　an　experimental　study　aimed　at　investigating　the　effects　of　strain　rate　and　temperature　on　the　tensile　mechanical　properties　of　polyethylene　naphthalene　(PEN)　fiber　bundles　by　using　a　drop-weight　impact　system.　A　total　of　65　specimens　with　a　gauge　length　of　25　mm　were　prepared　and　tested.　The　test　variables　included　five　different　strain　rates　(1/600,　40,　80,　120　and　160　s(1))　and　five　different　temperatures　(-50,　-25,　0,　25　and　50　degrees　C).　The　results　indicated　that　the　tensile　strengths　and　elastic　moduli　of　the　specimens　increased　with　the　strain　rate,　whereas　the　failure　strain　decreased　and　the　toughness　remained　almost　unchanged　with　the　increase　of　the　strain　rate.　The　tensile　strength,　toughness　and　failure　strain　initially　improved　and　then　reduced　with　an　increasing　temperature　from　-　50　degrees　C　to　50　degrees　C.　A　Weibull　distribution　model　was　implemented　to　describe　the　degree　of　variability　in　the　tensile　strength　of　PEN　fiber　bundles　for　future　use.　(C)　2021　Elsevier　Ltd.　All　rights　reserved.