Figures (2–7) showed the effect of the temperatures (400 oC to 600 oC) Increasing by 50 oC on the six types of plastic waste, the details as following
3.1 LDPE type
Pyrolysis of LDPE products against the various temperatures are depicted in Fig. 2. LDPE is characterized by being better ductility, easier to be molded, less crystalline structure and better water resistant than HDPE so it is widely used in the plastic bags which are used in this experiment.
Fig.2. showed that the amount of the oil produced increases with increasing temperature during temperature range (400 oC to 550 oC), the largest amount of oil is obtained 69% at 550 oC, with 22% gas and 10% char. This amount was very close to the authors in  they found 74.7 % oil product by using batch reactor at 450 oC, in another trend in the study in  it was recorded the highest amount of oil at 93.1% at optimum temperature 550 oC, this high percentage may be that the researchers used the LDPE feedstock in the a powder form at maximum size 500 µm,
With the increase in temperature in the present study to 600 oC the oil decreased to 38% and the gas percentage increased to 53%, this increase in gas is a result of secondary reaction of oil to convert oil to gas this agreement with the authors in .
3.2 HDPE type
HDPE has high strength properties because it is a long polymer chain with high crystalline and low branching, Therefore, HDPE is widely used in detergent and dairy bottles, children's toys, water and oil containers, which is used in this laboratory study.
Figure 3. showed that the effect of temperature on the products of the HDPE pyrolysis process, during the experiments run at temperatures 400 oC and 450 oC, it was observed that part of the HDPE vapors condensed on the wall of the oil collector in the form of yellowish brown wax 27% at 450 oC instead of liquid oil, this phenomenon is in agreement with the researchers  their study showed that thermal PE pyrolysis produced maximum oil 25% at 450 oC in wax form instead of liquid with 62% gases and 13% char by using a small batch reactor 30L capacity and 10 oC /min.
With an increase in the temperature to 500 oC and above, liquid oil droplets were observed and after a period of time it turned into wax, the maximum oil/wax is obtained 63%, 29% gases and 8% char at optimum temperature 550 oC, the researchers S. Kumar and R. K. Singh  they recorded close to these results, their study showed that the maximum oil/wax were 7.86% and 71.22% at 550 oC respectively by using a batch reactor, 20 oC /min heat rate.
By increasing the temperature to 600 oC, the oil produced decreased to 41%, while the amount of gas increased to 52%, 7% for char.
3.3 PS type.
PS is styrene monomers, the chemical structure of PS is a long string from hydro-carbon with phenyl group connected to another carbon atom, strength, lightness, credible durability, heat resilience and colorless these are the essential characteristics of PS that make it desired to be used in many various of industrial applications and sectors such as in one used food plates, that are used in this study.
Fig.4. indicated the effect of temperature on the thermal PS pyrolysis, at 400 oC PS type produced a large amount of oil dark black 55%, 35% gases and 10% char, but the maximum of oil was achieved at optimum temperature at 450 oC, oil produced at 82.5%, 15% gases and 2.5% char, with increasing the temperature caused a decrease in the amount of oil in return, an increase in gas percentage, at 600 oC oil decreased to 68%, 30% gas and 2% char, this was explained by the fact that a part of the amount of oil evaporated into gas due to the increase temperature, this trend completely agreed with the study  the authors found the maximum oil produced from thermal PS pyrolysis was 80.8% at optimum temperature 450 oC
Increasing gas product with decreasing oil yield at high temperature was explained by the authors in  they showed that at the higher temperature on optimum temperature some a secondary reaction was occurred to start the polyaromatic formation reactions that decreased styrene yield and the liquid oil product.
On the other trend the authors in study  they showed that the thermal pyrolysis of PS type produced a very high score liquid oil product was about 97.0% wt and minimum gas yield 2.5% wt. at optimum temperature 425 oC, these high results because of the controlled condition of this study as a pressurized batch reactor 0.3 L capacity, 10 oC/min heat rate, 1.26 MPa operating pressure and one hour time duration.
3.4 PET type
chemical stability Strength, hygienic use, and corrosion resistance are the essential properties that distinguish PET from other types of plastic and become it the ideal choice for food containers, soft water and juices bottles 
Fig.5. showed the effect of temperature on the PET pyrolysis products, it is clear that PET is very poor in oil production. where the highest amount of oil is recorded 3% at a temperature of 400 oC and with the increase in temperature, the amount of oil decreased until it almost disappeared 1% at 600 oC, on the contrary, for gas product, the increase in temperature increased the amount of gas to a very large yield 85 % at 600 oC. This results is in agreement with the authors in , their study showed that the oil and gas yield is recorded 21 g. (1.4% wt.) and 1029 g. (68.6% wt.) respectively from 1500 g. PET feedstock by using the waste water bottles in a fixed bed reactor at 450 oC and 2500 Watt electrical heater, on the same trend, the study in [15 the researchers recorded zero of the oil produced during each temperature range (300 oC to 700 oC). The small amount of oil resulting from the PET pyrolysis has been explained by researchers in  they showed that the waste PET has the lowest volatile matter compared the others plastic waste types.
3.5 PP type
PP is widely used in industrial products that are frequently used in our daily life, such as textiles, auto parts, home furniture, packaging supplies and food containers, due to PP has a high heat and chemical resistance, rigidity and higher hardness compared with HDPE type.
Figure 6. shows the effect of temperature on the product of the PP pyrolysis process at 400 oC recorded the amount of oil 5%, gas 45% and char 50% and with increasing temperature the amount of oil increased until it reached its highest levels at the optimum temperature 500 oC and reached at 47.5%, gas 42.5% and char 10% and by increasing on the optimum temperature to 600 oC the amount of oil decreased to 20%,while the amount of gas increased to 75% and char 5%.
The researchers in  largely agreed with these results, their studies showed that the largest amount of oil produced from PP pyrolysis at 42% wt but at another optimum temperature 450 oC, with 54.5% gas, and 3.5% char. On the same trend, A. Demirbas in  his study indicated that the maximum oil product from PP pyrolysis is obtained at 48.8% wt and 49.6% wt for gases, but at another optimum temperature 740 oC by using a batch reactor, and 10 K/min heat rate .
On the other trend, the authors in  their study was recorded a higher oil product from pp thermal pyrolysis 64.9% with 24.7% for gases at optimum temperature 380 oC by using a glass batch reactor, 3 oC /min and 300 mm. l. capacity.
3.6 Mixture plastic waste type
The thermal pyrolysis of PWM has attracted the interest of many researchers to recover energy from plastic waste, because the p.w.m. pyrolysis is the ideal technique for the waste, which is difficult to sort into specific types, and as a result, the thermal pyrolysis of the mixture requires less labor and therefore is better economically.
The present experimental study of the p.w.m. pyrolysis indicated that, at low temperature 400 oC is recorded minimum oil produced at 5%, with 45%and 50%wt for gases and char yield respectively, with increasing the temperature, the oil product in creased at maximum amount 40% at optimum temperature 500 oC, with 45% and 15% for gases and char yield respectively, at high temperature 600 oC, oil yield decreased to 28.75% and gases is recorded maximum amount 60% with a small char is obtained at 11.25%, this results are showed in Fig. 7.
Close to these results, the authors in  their study is showed that the maximum amount of oil yield is obtained at 48.4% at optimum temperature 650 oC, with 36.9% and 15.7% for gases and char respectively, these results are recorded by using a fluidized quartz-bed thermal pyrolysis, 1–3 kg/h capacity, and the mixture consisted of 46% LDPE, 30% HDPE and 24% PP.
On the same trend, the study in  the authors recorded the largest amount of oil at 40% at optimum temperature 450 oC, with 42%, 18% for gases and char respectively, when the mixture consisted of 40%, 20%,20% and 20% for PS, PE, PP and PET.
On the other side, the researchers in  their study is obtained the maximum oil produced 72% wt at optimum temperature 460 oC, with 26.9% and 1.1% for gases and char respectively, these results are recorded by using a semi batch reactor 3.5 L capacity, thermal pyrolysis, 20 /min heat rate and the mixture consisted of 40%, 35%, 18%, 4% and 3% for PE, PP, PS, PET and PVC.