Ciba Polymer Kabir helps you find the best solutions to improve the production and quality of your products. As for the customer-centric strategy, all products of Ciba Polymer Kabir are tested in real and standard conditions.
The Ciba Polymer KABIR Research and Development Center utilizes a variety of tests such as rheological, process, physical and mechanical properties as well as analytical tests to accurately control the quality of the produced masterbatches and compounds, thereby helps to product uniformity and reducing waste. In this regard, the most important tests performed from the time of entry of raw materials to the exit of the product and final approval are included:

Melt Flow Index (MFI) Measurement

In order to investigate the rheological properties of the produced masterbatches and compounds, the relative melt flowability or melt flow index (MFI) is measured based on the capillary viscometer method, according to ASTM 1238 or ISO 1133. Melt flow index unit (MFI) is defined as the mass of molten polymer in garm flowing in ten minutes through a capillary of a specific diameter and length by a pressure applied via prescribed alternative gravimetric weights for alternative prescribed temperatures. Therefore MFI standard unit is g/10 min.  The melt flow index is inversely related to the melt viscosity; so thath it decreases as the average molecular weight of the polymer increase and consequently the polymer melt viscosity increase. Higher melt flow index indicates greater fluency at processing temperatures. It is primarily intended to represent rheological properties as a measure of extrudability. In general, with increasing melt flow index, tensile strength, tear strength, softening temperature and polymer toughness are somewhat reduced.

Density Measurment

In order to applying a polymer, it is usually necessary to know the its density. Whenever the polymer type is specified, its density can be deduced from the polymer handbooks. Otherwise the density can be determined by a simple and rapid test.
It should be noted, however, that even for a certain polymer, the density must be measured because the density is a function of the percentage of crystallization, plasticizer content, filler, etc. Therefore, in the polymeric masterbatch and compound industry, it is necessary to determine the density of raw materials and manufactured products.
The density measurement method is based on two principles:
1. If a solid is placed in a incompatible fluid (insoluble in fluid) with same density, it becomes immersed and appears weightless.
2. When two immiscible liquids with different densities are mixed, the total volume of the mixture is equal to the sum of the volumes of the two liquids (mixing of two liquids does not reduce or increase the total volume), then the system density is calculated from the mixtures law.

The test method is based on ASTM D792 or ISO 1183 as follow:

Put a small piece of the desired polymer in the test tube (a granule can be used), and the set is weighed. Some liquid of a less specific weight than the polymer was added to precipitate the polymer. The total weight of the liquid and polymer is then measured. Now add another liquid that has a higher specific gravity than the polymer until the polymer is raised and completely suspended in the new mixture. Again, the total weight of the test tube and its contents are measured. In this case, the density of the polymer is equal to the density of the two liquid mixtures. Since the weight of each added fluid and its density are known, it is easy to calculate the density of the polymer by calculating the mixture density of the two liquids from the mixtures law.

Ash content & Carbon black content Determination

To determine the percentage of inorganic fillers, carbon-black or pigments in the manufactured masterbatches and compounds, the ash content test is performed according to ASTM D5630. In this method a certain amount of sample is precisely weighed and preheated inside a furnace at a specified temperature and ambient atmosphere for a specified time. Next, to ensure complete combustion, the heat will be raised to a certain temperature and maintained. Finally, the sample is removed from the oven and re-weighed after cooling. As a result of the weight difference created, the percentage of ash or carbon-black can be calculated.

Moisture content Determination

Generally, the presence of moisture in the polymeric masterbatches and compounds both in production processes and in the final product leads to many problems. In this regard, it is necessary to measure the moisture content of the raw materials and the final product. This test is performed by ASTM D4019 and ASTM D6869 standards on the Ciba Polymer Kabir products by partner laboratories.

Quality Control of Filler Dispersion and Coating

In order to achieve the optimum and uniform quality for products as well as to study their effects in the final product, all Ciba Polymer Kabir products have been formed in films format with variety of thicknesses by a laboratory blow film machine. Despite visual inspection and microscopy of these films, complementary tests were also used to analyze the effects of  applied masterbatches and compounds.

complementary Tests

In order to evaluate the quality of masterbatches and manufacturing components, additional tests are performed on them depending on the final application. The most important of these tests are:

Rheometry

Tensile

Electron Microscopy