Verification & Certification


Our primary concern and our basic commitment is to ensure the quality of our products. In addition to the advanced mechanical equipment and the specialized personnel involved in the production process of pipes and fittings, SOLIN ensures the quality of its products with daily, regular laboratory tests on random samples from each production batch, as well as on each new receipt of raw material.

Check on each new batch of raw material

The raw materials used for the production of our pipes are certified by independent quality laboratories for their durability over time, their suitability for drinking water and have all the physical, mechanical and chemical properties depending on the type of pipe we produce. (PEX-b, PE-RT, Pb, HDPE, PP).

Flow Index Control (MFI)

Upon receipt of each raw material, the melt flow index MFI (acc. ISO 1133) and the density (acc. ISO 1183) are measured so that they correspond to the values provided by the specifications for each type of material.

Measurement of the degree of cross linking

The measurement of the degree of crosslinking for PEX-b pipes is performed by the method of dissolution in boiling xylene by calculating the change in the mass of the sample according to DIN 16892 and by the method of Hot Set Test (IEC 540) where we draw the samples by hanging them with a suitable weight in a constant temperature oven, while we calculate the crosslinking degree according to their elongation.

Measurement of the water hardness of the network and its temperature

Heat reversion test

Longitudinal Heat Reversion Test is a method of determining the level of internal stresses in pipes. We place the samples on a talcum powder to have "free" movement, we then place them in the oven at a specific temperature and time depending on the material of the pipe. The length of the marked part of the pipe piece is measured before and after the heating process under the same conditions. The ability to get old is the ratio of the length to the initial length. It is given as a percentage.

Microscopic homogenization inspection of the material

Various pipe samples are taken during production and the degree of homogenization of the raw materials is measured under a microscope.

Measurement of Environmental Stress Crack Resistance (ESCR)

The ability of a polymer to resist slow crack growth or environmental stress cracking is known as ESCR. It is measured by an accelerated process in a suitable chemical environment and gives us data on the strength of the pipes over their lifetime.

Pipe mechanical resistance control with tensile trials

Tensile strength tests and determination of elasticity coefficient and elongation of PB (ISO 527-1) pipes, are always made at the beginning of production and periodically when required and are indication of good production quality and mechanical strength of PB pipes.

Internal Hydrostatic Strength

Internal hydrostatic strength of a pipe, is the capability of withstanding internal pressure under specified conditions (temperature and time). All tests are performed according to the specifications for each type of pipe.

OIT (oxydation induction time) measurement

OIT (oxidation induction time) measurement, is performed on both the raw material and pipe produced. It is an accelerated process of thermal aging in an oxidizing environment that gives us data, both for the proper stabilization of the raw material, and the resistance to oxidation over time of the final product.

During the production process are carried out daily:

Visual inspection and measurement tests

During production, there is a continuous visual inspection of the surface of the pipe as well as measurements of diameter, wall thickness, thickness difference and ovality of the pipe with mechanical means and online with specialized electronic ways.

Measuring the thickness of the oxygen barrier

Measurement of the thickness of the oxygen barrier (film) and the adhesive layers in multilayer pipes with a microscope and a suitable electronic program.

Checks according to specifications

All inspections performed on our pipes are in accordance with the specifications of each material (DIN, ASTM, BS, AENOR. EN ISO). The results of the inspections are recorded in registers and periodically checked by independent quality entities such as SKZ, WRAS, ITS, ISO.

Laboratory equipment:

All control and measuring devices of our laboratory are calibrated and certified by an independent calibration laboratory (calibration frequency every year) for their uninterrupted operation and accuracy of measurements.

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