Standard: TAPPI
Method: T 419
Title: Starch in paper
Overview
This method describes the qualitative and the quantitative determination of unmodified starches and starches modified only by conventional oxidation techniques or enzyme conversion, which are used for beater addition or surface sizing. This procedure measures the total starch content and does not differentiate between starch inside and on the surfaces of the paper. Some starches that are cationic, substituted, grafted, or combined with resins are not within the scope of this procedure, because special techniques are required for them. Test to determine whether the starch is appropriate for this procedure by checking for extractability. If it can be extracted quantitatively and forms the iodine complex, it should be able to be determined by this method. The amount of actual starch content is a measure of the sizing content added to the paper. It can also be used as a measure of size retention in the papermaking process.
Samples
This test is performed in duplicate. At least 5 grams of dried material is required. IPS uses Penford Gum 280 Starch for its calibration curve. Customers may submit their own starch to be used for a calibration curve. Custom calibration curves are charged at the same rate as starch determinations.
Please note:
IPS cannot sell or otherwise provide standards, specifications, or test procedures to third parties.