The resins contain 5-10% non cleavable covalently attached ligands, 40 - 45% linker for peptide amide release at low concentrated TFA (5%) and 40 - 45% linker for peptide amide release with 95% TFA. The peptide, liberated by 5% TFA treatment must be separated from the resin and deprotected with 95% TFA in a follow up step. This resin type is designed for screening of peptide amide libraries by sequential release.