In the case of half-toilet soaps, the combined unsaponifiable fat and unsaponifiable matter are not tested, iodine number and chainic acid content.
In the case of household soaps, the titers of separated fatty acids are not tested, iodine number, the neutralization number of the separated fatty acids, foaming capacity and lauric acid content. Instead, the content of unsaponifiable fat is determined (no greater than 0,25%) and the color of the separated fatty acids (no more than 170 - test according to the standard).
■ Incomplete quality testing of toilet soaps includes a shape check, appearance, homogeneity, odor and color, and determination of total fatty acids, including resin acids, determination of free caustic alkalis and determination of the titre of separated fatty acids, including resin acids. The scope of incomplete tests for half-toilet soaps is analogous, however, in the case of household soaps, it is not expected that the titre of separated fatty acids will be determined.
■ Soaps used as laundry detergents are tested primarily on soap flakes and threads. Depending on the qualitative characteristics, two species are distinguished (I to II) soap flakes and threads. A complete study of the quality of these products is more detailed than with household soap, also considered as a washing agent, and includes checking the following requirements:
• appearance, color and smell;
• total fatty acid content: no less than 78%;
• unsaponifiable fat and unsaponifiable matter content: no more than 1,7%;
• free alkali content: no more than 0,1%;
• resin acid content: no more than 1%;
• unsaponified fat content: no more than 0,5%;
• content of unsaponifiable substances: no more than 1,2%;
• carbonate content converted to Na2CO3: no more than 0,5% for the first species, for II grade - not normalizing;
• chloride content: no more than 1% for the first species, for II grade - not normalizing;
• neutralization number of the separated fatty acids, including the resin ones: no less than 220 mg KOH / g for I species, for the second grade - not less than 195 mg KOH/g;
• iodine number: no greater than 65 for the first species, for II grade - not normalizing;
• washing capacity (marked according to the standard): not less than 110 for the first species, for the second grade - not less than 105.
Incomplete quality checks of petals and soap threads include checking the appearance, colors, the smell, total fatty acid content, unsaponifiable fat and unsaponifiable matter content, free alkali content and resin acid content.
