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\n\n \n \n \n \n \n \n Fire behavior of thermally modified pine (Pinus sylvestris) treated with DMDHEU and flame retardants: from small scale to SBI tests.\n \n \n \n \n\n\n \n Wu, M.; Hötte, C.; Karthäuser, J.; and Militz, H.\n\n\n \n\n\n\n
Holzforschung, 0(0). April 2025.\n
Publisher: De Gruyter Section: Holzforschung\n\n
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@article{wu_fire_2025,\n\ttitle = {Fire behavior of thermally modified pine ({Pinus} sylvestris) treated with {DMDHEU} and flame retardants: from small scale to {SBI} tests},\n\tvolume = {0},\n\tcopyright = {De Gruyter expressly reserves the right to use all content for commercial text and data mining within the meaning of Section 44b of the German Copyright Act.},\n\tissn = {1437-434X},\n\tshorttitle = {Fire behavior of thermally modified pine ({Pinus} sylvestris) treated with {DMDHEU} and flame retardants},\n\turl = {https://www.degruyterbrill.com/document/doi/10.1515/hf-2025-0021/html},\n\tdoi = {10.1515/hf-2025-0021},\n\tabstract = {In this study, thermally modified Scots pine ( Pinus sylvestris L.) was impregnated with DMDHEU (1,3-dimethylol-4,5-dihydroxyethyleneurea) monomers combined with a flame retardant (FR) based on monoguanidine phosphate salt. Fire performance was assessed using ignitability tests (ISO 11925-2, 2020), mass loss calorimetry test (ISO 13927, 2015), and single burning item (SBI) tests (EN 13823, 2020). Results showed enhanced flame retardancy, reaching Class B in the SBI test. Small-scale ignitability tests revealed minor differences in flame spread across samples, unlike the SBI results. Fire growth rate and ignition time from mass loss calorimetry strongly correlated with burning suppression in the SBI test.},\n\tlanguage = {en},\n\tnumber = {0},\n\turldate = {2025-04-25},\n\tjournal = {Holzforschung},\n\tauthor = {Wu, Muting and Hötte, Christoph and Karthäuser, Johannes and Militz, Holger},\n\tmonth = apr,\n\tyear = {2025},\n\tnote = {Publisher: De Gruyter\nSection: Holzforschung},\n\tfile = {Full Text PDF:/home/maicher/Zotero/storage/YQQDMZXV/Wu et al. - 2025 - Fire behavior of thermally modified pine (Pinus sy.pdf:application/pdf},\n}\n\n
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\n In this study, thermally modified Scots pine ( Pinus sylvestris L.) was impregnated with DMDHEU (1,3-dimethylol-4,5-dihydroxyethyleneurea) monomers combined with a flame retardant (FR) based on monoguanidine phosphate salt. Fire performance was assessed using ignitability tests (ISO 11925-2, 2020), mass loss calorimetry test (ISO 13927, 2015), and single burning item (SBI) tests (EN 13823, 2020). Results showed enhanced flame retardancy, reaching Class B in the SBI test. Small-scale ignitability tests revealed minor differences in flame spread across samples, unlike the SBI results. Fire growth rate and ignition time from mass loss calorimetry strongly correlated with burning suppression in the SBI test.\n
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\n\n \n \n \n \n \n \n Enhancing fire resistance in pine wood through DMDHEU resin and phosphate-nitrogen flame retardant synergies.\n \n \n \n \n\n\n \n Wu, M.; Emmerich, L.; and Militz, H.\n\n\n \n\n\n\n
European Journal of Wood and Wood Products, 83(2): 56. April 2025.\n
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@article{wu_enhancing_2025,\n\ttitle = {Enhancing fire resistance in pine wood through {DMDHEU} resin and phosphate-nitrogen flame retardant synergies},\n\tvolume = {83},\n\tissn = {0018-3768, 1436-736X},\n\turl = {https://link.springer.com/10.1007/s00107-025-02207-1},\n\tdoi = {10.1007/s00107-025-02207-1},\n\tabstract = {Wood modification with 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU) has been widely demonstrated to enhance the biological durability and dimension stability of wood, thus it serves a predestined technology to equip wooden products for outdoor applications. However, such technology hardly affects the fire performance of wood, a parameter which gains increasing relevance in the construction sector. Recently, the combination of curing resins with flame retardants has been proposed as a potential approach to enhance the fire performance of wood in a permanent way, hence providing a durable fire protection system. Scots pine sapwood (Pinus sylvestris L.) was impregnated with aqueous compositions of DMDHEU, a commercially available phosphate-nitrogen based fire retardant (adapted for wooden applications) and combinations thereof. The fixation of the flame retardant was assessed on the basis of a cold water leaching process according to EN 84 (2020). The fire performance of the treated wood was assessed through thermal gravimetry analysis (TGA), a Bunsen burner ignition test and mass loss calorimeter. Both wood treated with pure flame retardant and combination of a flame retardant and DMDHEU, demonstrated improvements in thermal stability, reduced flammability and decreased heat release after treatment. Notably, the THR600s of wood treated with DMDHEU in combination with the flame retardant was reduced by 89.3\\% compared to wood treated solely with DMDHEU. However, after the leaching process, the flame retardant happened to leach out almost completely, which was assessed on the basis of a loss in its efficacy related to fire protection. On the contrary, DMDHEU seemed to partially fix the flame retardant inside the wood matrix, which was derived from a persistent enhancement in fire performance, even after wooden specimens passed a cold water leaching.},\n\tlanguage = {en},\n\tnumber = {2},\n\turldate = {2025-02-13},\n\tjournal = {European Journal of Wood and Wood Products},\n\tauthor = {Wu, Muting and Emmerich, Lukas and Militz, Holger},\n\tmonth = apr,\n\tyear = {2025},\n\tpages = {56},\n\tfile = {Wu et al. - 2025 - Enhancing fire resistance in pine wood through DMD.pdf:/home/maicher/Zotero/storage/KCLK8CGF/Wu et al. - 2025 - Enhancing fire resistance in pine wood through DMD.pdf:application/pdf},\n}\n\n
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\n Wood modification with 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU) has been widely demonstrated to enhance the biological durability and dimension stability of wood, thus it serves a predestined technology to equip wooden products for outdoor applications. However, such technology hardly affects the fire performance of wood, a parameter which gains increasing relevance in the construction sector. Recently, the combination of curing resins with flame retardants has been proposed as a potential approach to enhance the fire performance of wood in a permanent way, hence providing a durable fire protection system. Scots pine sapwood (Pinus sylvestris L.) was impregnated with aqueous compositions of DMDHEU, a commercially available phosphate-nitrogen based fire retardant (adapted for wooden applications) and combinations thereof. The fixation of the flame retardant was assessed on the basis of a cold water leaching process according to EN 84 (2020). The fire performance of the treated wood was assessed through thermal gravimetry analysis (TGA), a Bunsen burner ignition test and mass loss calorimeter. Both wood treated with pure flame retardant and combination of a flame retardant and DMDHEU, demonstrated improvements in thermal stability, reduced flammability and decreased heat release after treatment. Notably, the THR600s of wood treated with DMDHEU in combination with the flame retardant was reduced by 89.3% compared to wood treated solely with DMDHEU. However, after the leaching process, the flame retardant happened to leach out almost completely, which was assessed on the basis of a loss in its efficacy related to fire protection. On the contrary, DMDHEU seemed to partially fix the flame retardant inside the wood matrix, which was derived from a persistent enhancement in fire performance, even after wooden specimens passed a cold water leaching.\n
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\n\n \n \n \n \n \n \n Fire resistance of Scots pine modified with sorbitol, citric acid and fire retardants.\n \n \n \n \n\n\n \n Sivrikaya, H.; Wu, M.; and Militz, H.\n\n\n \n\n\n\n
European Journal of Wood and Wood Products, 83(3): 127. June 2025.\n
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@article{sivrikaya_fire_2025,\n\ttitle = {Fire resistance of {Scots} pine modified with sorbitol, citric acid and fire retardants},\n\tvolume = {83},\n\tissn = {0018-3768, 1436-736X},\n\turl = {https://link.springer.com/10.1007/s00107-025-02282-4},\n\tdoi = {10.1007/s00107-025-02282-4},\n\tabstract = {Abstract\n \n Sorbitol-citric acid (SorCA) modification is an eco-friendly wood treatment that demonstrates promising potential for enhancing dimensional stability and decay resistance of wood material. To improve the fire resistance property of SorCA (1:2; 30\\%) modified wood, fire retardants (FRs) such as diammonium hydrogen phosphate (DAP) and potassium carbonate (PC) were incorporated into the modification system at a rate of 10\\% and 15\\%, respectively. Scots pine wood modified with the combination of SorCA and FRs was subjected to mass loss calorimeter test to evaluate its flame retardancy. In addition, thermogravimetric analysis (TGA) was carried out for determining the thermal behaviour of modified wood at elevated temperatures. Fourier-transform infrared spectroscopy (FTIR) was used to identify the chemical bonds in the modified wood. The FTIR spectrum indicated an intensity enhancement at 1716 cm\n − 1\n , resulting from the bonding with the cell wall or between the reagents. TGA analysis showed that the addition of DAP and PC to the SorCA system enhanced the thermal stability, yielding higher residual mass compared to SorCA alone and the untreated reference. The mass loss calorimeter revealed that SorCA with DAP 15\\% significantly improved flame retardancy, lowering the peak heat release rate by 65\\% and total heat release within 600 s by 82\\% compared to untreated wood. The combination of SorCA with DAP and PC contributed to the char formation and showed potential flame retardancy for modified Scots pine wood.},\n\tlanguage = {en},\n\tnumber = {3},\n\turldate = {2025-06-26},\n\tjournal = {European Journal of Wood and Wood Products},\n\tauthor = {Sivrikaya, Hüseyin and Wu, Muting and Militz, Holger},\n\tmonth = jun,\n\tyear = {2025},\n\tpages = {127},\n}\n
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\n Abstract Sorbitol-citric acid (SorCA) modification is an eco-friendly wood treatment that demonstrates promising potential for enhancing dimensional stability and decay resistance of wood material. To improve the fire resistance property of SorCA (1:2; 30%) modified wood, fire retardants (FRs) such as diammonium hydrogen phosphate (DAP) and potassium carbonate (PC) were incorporated into the modification system at a rate of 10% and 15%, respectively. Scots pine wood modified with the combination of SorCA and FRs was subjected to mass loss calorimeter test to evaluate its flame retardancy. In addition, thermogravimetric analysis (TGA) was carried out for determining the thermal behaviour of modified wood at elevated temperatures. Fourier-transform infrared spectroscopy (FTIR) was used to identify the chemical bonds in the modified wood. The FTIR spectrum indicated an intensity enhancement at 1716 cm − 1 , resulting from the bonding with the cell wall or between the reagents. TGA analysis showed that the addition of DAP and PC to the SorCA system enhanced the thermal stability, yielding higher residual mass compared to SorCA alone and the untreated reference. The mass loss calorimeter revealed that SorCA with DAP 15% significantly improved flame retardancy, lowering the peak heat release rate by 65% and total heat release within 600 s by 82% compared to untreated wood. The combination of SorCA with DAP and PC contributed to the char formation and showed potential flame retardancy for modified Scots pine wood.\n
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