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INCOME TAXES
 6 Months Ended
Jun. 30, 2026
Income Tax Disclosure [Abstract]  
INCOME TAXES 8. INCOME TAXESTredegar recorded tax expense (benefit) of $2.8 million on pre-tax income (loss) from continuing operations of $13.9 million in the first six months of 2026. The effective tax rate in the first six months of 2026 was 19.9% and 38.4% in the first six months of 2025. The effective tax rate for the first six months of 2026 varied from the statutory rate of 21% due to research and development tax credits while the effective tax rate for the first six months of 2025 varied from the statutory rate due to a mix of lower pre-tax income and higher nondeductible discrete items as a percentage of pre-tax income.