Information 2023 2022 2021 2020 2023 2023.05.25 INFO Biomass Mark certified! 2023.05.18 PORON The TR-20 is the latest addition to the PORON 'Heat Resistant Series'! 2023.05.18 INFO Heat resistant Series 3 grade UL94 HBF approved! 2022 2022.12.21 PORON End of Certification by UL Standard Revision 2021 2021.12.22 PORON Excellent Impact absorption, SA-30 joined Consumer Series 2020 2020.06.04 INFO SGS report was updated.