60 rpm tg measured via differential scanning calorimetry the battery separators were prepared for testing by applying the comparative binders a b c and binders 1 2 3 4 5 approximately 45 solids by weight to a sheet of prebonded microglass fiberglass the sheet was soaked in the binder until it was completely covered excess binder was removed by either passing it through low pressure nip rolls or by placing it between several layers of blotter paper and rolling gently with a 20 pound couch roll the sheet was attached to a pin frame to prevent distortion upon heating the sheet was then heated in a forced draft oven for 3 5 minutes at 200 u00b0 c the battery separator components must be resistant to acid and other attacks by oxidative and reductive chemical reactions conditions typical in a highly acidic electrolytic battery medium the stability of the latex binder is determined by its ability to resist delamination from a fiberglass battery separator the conditions of the test simulate those that the battery separator would encounter during the life of a lead acid battery cell to prepare the sulfuric acid reagent 800 ml of concentrated sulfuric acid was added to 3200 ml of water the mixture was stirred cooling to room temperature and then adjusted to a.