Laboratory Tests

KUZEYBORU QUALITY LABORATORY TEST INFORMATION

HYDROSTATIC PRESSURE

Thermoplastic tubes at a constant temperature, constant are used for the determination of the internal water pressure resistive. In pipes 20 and 80 ° C is measured under pressure bearing performance. 100 h in water at 20 ° C, 80 ° C for 165 h in water at standard pressure is given by the formula specified. In these circumstances, the results of the tests should not be damaged in the sample.

Experiments are performed as follows (EN 921): 

• The device and the power of the water tank is filled (the water tank is filled with water continuously causes the decay of heat resistance). 
• The device is coded to do the test temperature. 
• Both ends of the specimen are sealed by the compression means and the inside is filled with water. 
• The sample was heated in water pipes according to the characteristics specified in the standard is allowed to conditioning. 
• After 100 h at 20 ° C in water, standard on for 165 h at 80 ° C in water is pressurized by a specified formula. 
• Duration damage is observed in the sample at the end. 
• Calculation of the test pressure:

p = 10σ x 2e/de - e

Here;

σ: Applied pressure caused by environmental stress, MPa; 
a: The mean outer diameter of the test piece, mm; 
E: The test piece of the free length of the lowest measured wall thickness, mm


PE 100 PIPE TEMPERATURE AND TIME DEPENTENT PRESSURE STRENGTH 

TemperatureService Life PN4
(SDR 41) 
PN10
(SDR 17,6) 
PN16
(SDR 11)
PN20
(SDR 9)
10 (⁰C) 5
10
25
50 
5,0 Bar
4,9
4,8
4,7 
12,6 Bar
12,4
12,1
11,9 
20,2 Bar
19,8
19,3
19,0
25,2 Bar
24,8
24,2
23,8
20 (⁰C) 5
10
25
50 
4,2
4,1
4,0
4,0 
10,6
10,4
10,1
10,0 
16,9
16,6
16,2
16,0
21,2
20,8
20,3
20,0
30 (⁰C) 5
10
25
50 
3,6
3,5
3,4
3,3 
9,0
8,8
8,6
8,4 
14,4
14,1
13,8
13,5
18,8
17,7
17,2
16,9
40 (⁰C) 5
10
25
50 
3,0
3,0
2,9
2,9 
7,7
7,6
7,4
7,2 
12,3
12,1
11,8
11,6
15,4
15,2
14,8
14,5
50 (⁰C) 5
10
25 
2,6
2,6
2,3 
6,7
6,5
5,9 
10,7
10,4
9,5
13,4
13,0
11,8

DISTRIBUTION OF CARBON BLACK

Carbon black in the product must be distributed homogenously. If a homogeneous distribution of heat within the product in some areas, will be affected by environmental conditions such as solar radiation. That exposed parts will be weaker than other parts of the product and will start to rot quickly. The product becomes brittle and begins cracking. Therefore the distribution of carbon black in the product is very important.


Experiments are performed as follows (ISO 11420): 

• Analysis of the sample to be examined under a microscope. 

• Standards compliance is observed. 

AMOUNT OF CARBON BLACK

Resistance against UV rays into the sample to give refinery environment homogeneously% of additional carbon is used for fastening. So carbon black and colorants, and is used as the UV stabilizer. Aboveground pipes in applications exposed to sunlight, a very effective protection against UV radiation. This effect depends on the amount of carbon in the wrap material.

Experiments are performed as follows (ISO 6964): 

• The device is opened and heated to 550 oC. 
• Nitrogen gas is opened. 
• Get the crucible and record the tare. 
• 1 gr sample is put into the crucible and the crucible is placed in a high temperature furnace. 
• All the components in the sample after 20 minutes to evaporate (illuminated parts) and carbon black (combustible components) will remain. 
• At the end of this period, the crucible is removed from the device, in order to avoid moisture from the environment konulur.vakuml vacuum desiccator to ambient conditions in the desiccator for 30 minutes to get used to. 
• The end of the time-weighed crucible. 
• Standart % carbon content is calculated by applying the formula give.


BREAKING STRENGTH

Thermoplastic pipes and profiles along the length of the short-term tensile properties and; 

- Tensile stress at yield or maximum load 
- Covers the determination of the elongation at break. 
Applies to all thermoplastic tubing. 

Tensile properties test, the materials used in the manufacture of pipes used to determine the properties. The mechanical properties of the material, The behavior of the material examined and opposite force is determined breaking strength. 

The material of construction of the tube depends on the diameter of the tube along the length of the pipe with a suitable pre-processing in a specified shape and size by cutting or milling of the test pieces are prepared.

Experiments are performed as follows (EN 638): 

• Parallel to the pipe axis so that a spoonful of types of strips cut sample is conditioned at 23 to be issued. 
• Pulling devices for upper and lower jaw are compressed samples. 
• The samples conditioned length Lo is measured and recorded. In addition to this, the wall thickness of the sample is measured and recorded. Cross section is calculated from these values​​. 
• Sample drawing speed; e≤5 mm and 100 mm / min, 12 mm ≥ A> 5 mm and 50 mm / min to> 12 mm and 25 mm / min is set. 
• Elongation% 350% depending on the size should be larger than the first.

EXPERIMENT MFR 


    A set temperature and load conditions, the mass flow rate of the molten thermoplastic material (MFR) is determined. So is the method of measuring mass.
MFR, density of test temperature and pressure when it is known in the molten mass can be determined from the MVR measurement. (MVR: volumetric flow rate) In principle, the measurement of the rheological properties during the hydrolysis, condensation or cross-linking thermoplastic affected by such events can be applied to statistics. MFR of the polymer chains are short or medium chain links in bağlıdır.kıs from diffusing into one another is easier. Because of this feature is higher than a flow rate long-chain. The SI unit of mfr dg / min is considered. Today, the accepted unit is 10 grams per minute (g / 10min A). Melt flow index, is highly correlated with molecular weight. Melt flow index and molecular weight are inversely related. If the melt flow index of a material of high density is low. High melt flow index of the material hardness increases. How much is the density of polyethylene raw material increases; Material density, fragility, softening and melting temperature, the higher the tensile stress.

Experiments are performed as follows (ISO 1133): 

• The device is opened and the temperature of 190 ° C is heated to. 
• Sample parts to be tested is poured into the cylinder on the device. 
• The average length of 15 mm material flow cut-off time will be automatically entered into the device. 
• Except for a few pieces of the first cut in five parts precision scales weighed average is taken and placed in the formula instead of g / min of MFR values ​​are denominated. 
• The material mass flow rate (MFR), g / 10 min is calculated by the following equation in terms of: 

           MFR (T rated) = 600 m / t 

here; 
            T: Test temperature, ° C, 
            Man Up: Rated load, kg, 
            m: The cut pieces of the average mass, g, 
            t: Cutting time intervals, s,

INDUCTION TIME DETERMINATION OF OXIDATION

        Antioxidant additives in polyethylene material with oxygen in the high temperature environment to prevent the time of oxidation of the material. This test material is a measure of how well stabilized.mmaterial does not become a good source of stabilized, 
extrusion or show deterioration in high temperature applications. 

Accordingly the life of the tubing will be reduced.


Experiments are performed as follows (EN 728): 

• The unit's cooling water and gas valves open. 
• Device 200 ° C up to heated. 
• The sample capsule is placed in the device. 
• The unit is run. 

With the operation of the device; nitrogen gas is introduced before setting, then fed into the oxygen atmosphere are observed for evidence of deterioration. Corruption must not be at least 20 minutes. Deterioration in a shorter time if the antioxidant material in the sample indicates the presence of more of.

PIGMENT DISPERSION



         Factors affecting the distribution of carbon black pigments are valid. In the case of the uniform distribution of pigment degradation are observed. 
Blue and yellow pigments, UV stabilizers, due to the behavior of materials also exhibit UV stabilizer should be involved. 

  Experiments are performed as follows (ISO 11420): 

• Analysis of the sample to be examined under a microscope. 
• Standards compliance is observed.

DENSITY (ρ) 

        Density; a substance the mass (m) to the volume (V) is the rate, kg / m 3, kg / dm 3 or kg / L is expressed. Density, branching of the polymer chain depends. Branching in the polymer chain increases, the crystallization will be reduced and the density will be reduced correspondingly. As density increases, the viscosity will increase and will decrease the permeability. Consequently, will increase the hardness of the resulting structure. The lower the density, viscosity will decrease and will increase fragility. In unit volume of material for a precision balance to determine the weight of liquid in the air before the samples are weighed and density.

Experiments are performed as follows (ISO 1183): 

• The sample is weighed in air with a balance of 0.001 g sensitivity and the device is recorded. 
• After weighing the sample is carried out in alcohol and the device is recorded. 
• The indicator on the device from the density (ρ) is read. 


High Density PE  Medium Density PE Low Density PE 
Density0,945-0,965g/cm3 0,926-0,940 g/cm3 0,910-0,925 g/cm3 
Production of Pressure700 atmosphere1000-1500 atmosphere1000-2000 atmosphere 
Temperature of Pressure<100 ⁰C 100-150 ⁰C 150-200 ⁰C 
The amount of The Branched molecular Chains4-5 ea/1000 35-50 ea/1000 80 ea/1000 
 Crystal Structure Rate
%90 crystal structure rate%70 crystal structure rate%60 crystal structure rate
Transparency Rate%90-95 %85-90 %50-85 
Melting Point135 ⁰C 120 ⁰C 95-105 ⁰C 
MFI (5 Kg/190 °C)0,22-0,60 g/10 min0,85 g/10 min >0,85 G/10 min 
Breaking Strength in 23 °C>21 MPa >15 MPa >23 MPa 
Modulus of Eleacticity 23 °C>600 >700 >1000 

MRS values ​​of different polyethylene raw materials;

MRS values of different polyethylene raw materials;

Raw Material Class                               MRS Value

         PE3                                            3.2 MPa

         PE 40                                         4.0 MPa

         PE 63                                         6.3 MPa

         PE80                                          8.0 MPa

         PE 100                                      10.0 MPa



Contact with KUZEYBORU

Kuzeyboru İletişim
Mavi Piksel
Kuzeyboru Plastik Sanayi ve Ticaret Limited Şirketi
Organize Sanayi Bölgesi 1.Cadde 2.Sokak No:33/A
Aksaray-TURKEY
+90 (382) 266 23 03 (Pbx)
info[at]kuzeyboru.com.tr

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