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Feb 2024

1.Polyethylene terephthalatePETPETEPET
Uses: polyester fiber, thermoplastic resin, tape and plastic bottles, commercial beverage bottles, edible oil bottles and other plastic bottles. Refer to the bottle recycling technology, heat 60-85 °C (140-185 °F) and acid and alkali resistance, overheating and long-term use may release the plasticizer dioctyl phthalate (DEHP) [10]. However, in general, PET materials do not add plasticizers.
White or transparent (rapid cooling during processing).
Plastic distinguishing features: The bottle body is formed without seams, and there will be a dot at the bottom. Easy to burn, burning will have black smoke and aromatic sweet, melt down after burning.

2.PEHigh-density polyethyleneHDPEPEHD
Uses: bottles, shopping bags, recycling buckets, agricultural pipes, cup holders, car barriers, fresh milk bottles, alcohol bottles, sports equipment and composite plastic wood, heat resistance 90-110 °C (194-230 °F) corrosion resistance, acid and alkali resistance, not easy to thoroughly clean residue, food containers should not be reused after cleaning.
It is white and translucent.
Plastic distinguishing features: feel like wax, bottle products are mostly opaque, plastic bag products rub or rub when rustling. Easy to burn, there is no black smoke and candle smell when burning, the flame tip is yellow and the lower end is green, and it is not extinguished when it is removed from the fire source.

3.PVCPolyvinyl chloridePVC/ V
Application: pipe, wall and non-food bottle, plastic wrap, egg carton, seasoning jar, etc.
Heat resistance 60-80 °C (140-176 °F), overheating easily releases a variety of toxic additives (used to improve the performance of this type of plastic, plasticizers containing environmental hormones) Generally PVC will have a large number of plasticizers in the process. Plasticizers are now available in non-toxic formulations, so PVC can continue to be widely used in a variety of products.
It is colorless and transparent.
The bottom of the round bottle product is a straight line, white marks will appear when it is folded vigorously, and it will become iron red after long-term exposure in the sun; Poor ductility will be extinguished naturally when it leaves the fire source, and there will be a blue flame on the edge of combustion, with black smoke and scorched taste of hydrochloric acid.

4.PELow-density polyethylene(LDPE/PELD)
Uses: plastic bags, various containers, medicine bottles, washing bottles, piping and all kinds of molded laboratory equipment.
Heat resistance 70-90 °C (158-194 °F), corrosion resistance, acid and alkali resistance, overheating easy to produce carcinogens.
White translucent/Thin film products appear transparent.
Plastic bag products are softer and less rustling when kneading; The packaging film is easier to tear. Easy to burn, there is no black smoke and candle smell when burning, the flame tip is yellow and the lower end is green, and it is not extinguished when it is removed from the fire source.

Uses: auto parts, industrial fiber and food containers, food utensils, water cups, pudding boxes, soy milk bottles, alcohol bottles, physiological salt liquid bottles, etc.
Heat to 100-140 °C (212-284 °F), acid and alkali resistance, chemical resistance, collision resistance, high temperature resistance, in the general food handling temperature is safer.
It is white and translucent.
The hardness is high and the surface is shiny. Easy to burn, no black smoke and diesel candle smell when burning, yellow or blue flame, not extinguished when removed from the fire source, burn quickly and completely after burning.

Uses: desk accessories, self-help trays, food utensils, toys, video cassette, Yro Do bottles, ice cream containers, foam bowls, spacers and Expanded polystyrene (EPS) products, such as styrene.
Heat resistance 70-90 °C (158-194 °F), low water absorption, good stability, acid and alkali solution (such as orange juice, etc.) or high temperature is easy to release carcinogens, not applicable to alcohol, not applicable to edible oils.
It is colorless and transparent.
It can be torn by hand, and white marks appear when it is broken lightly, and there is diffusion. Easy to burn, burning will have the smell of styrene, orange yellow black smoke, removed from the fire source is not extinguished, softened after burning.

7.OTHER/O include: melamine, ABS resin (ABS), polymethyl methacrylate (PMMA, one of the acrylic), polycarbonate (PC), polylactic acid (PLA), nylon and glass fiber reinforced plastics.
Use: food utensils.

· Polycarbonate (PC) heat resistant 120-130 °C (248-266 °F), not suitable for alkali;

· Polylactic acid (PLA) heat resistant to 50 °C (122 °F);

· Acrylic (PMMA) heat resistance 70-90 °C (158-194 °F), not suitable for alcohol;

· The heat resistance of the resin is 110-130 °C (230-266 °F), but there may be doubts about the dissolution of phenol methane (bisphenol A), so it is not recommended to hold hot food

· Polycarbonate (PC) heat resistant 120-130 °C (248-266 °F), not suitable for alkali;

· Polylactic acid (PLA) heat resistant to 50 °C (122 °F);

· Acrylic (PMMA) heat resistance 70-90 °C (158-194 °F), not suitable for alcohol;

· The heat resistance of the resin is 110-130 °C (230-266 °F), but there may be doubts about the dissolution of phenol methane (bisphenol A), so it is not recommended to hold hot food.

8. ABS
Used in food utensils.
Heat resistance 70-100 °C (158-212 °F), not suitable for alcohol.
It's beige.
  Plastic products are dazzling, the most diverse colors. To attract users to buy, and the testing of plastic properties, we are experts in related instruments. We have a complete set of experimental and trial production equipment for lithium electric separator using the process of thermal induced phase separation (TIPS), and have realized the mixing and extrusion, casting molding, bidirectional drawing, extraction molding, two-stage drawing and automatic winding of polymer materials. Such as lithium diaphragm production and preparation of the entire process of professional equipment. There are also small masterbatch dispersion tester, and filter pressure value tester, etc., suitable for various related plastic raw materials experiment and processing test.

For more information:

David +8613632376303

Email:[email protected] /[email protected]

Feb 2024
Laminating & Coating Extrusion related technical information sharing
  In recent years, with the continuous improvement of environmental awareness, people's attention to plastic products has been increasing, and higher requirements have been put forward for the quality and production efficiency of plastic products. In this context, extrusion coating film technology has become an indispensable part of the production process of plastic products. In order to better adapt to market demand, US company Nordson Extrusion Dies Industries has recently introduced a new die and seal strengthening system, specifically to solve the problem of thick edges of low melt strength polymers.

  The new die and seal strengthening system is uniquely designed to be well adapted to extrusion coating manufacturing processes for LLDPE, PP, high-performance copolymers and terpolymers. Its biggest advantage is its ability to reduce thick edges while maintaining an even coating volume. For polymers with low melt strength, in the production process, due to the influence of its own physical and chemical properties, it is easy to appear thick edge phenomenon, which will not only seriously affect the quality of products, but also reduce production efficiency and profitability. With this new die and seal strengthening system, such problems can be effectively improved, helping processors to quickly produce high-quality plastic products.

  Through continuous technological research and development and innovation, the position of extrusion coating film technology in the production process of plastic products continues to improve. In today's environment, processors also need to constantly update their production equipment to keep up with the market and keep pace with The Times. The introduction of these new die and seal strengthening systems will undoubtedly have a profound impact on the entire industry, making our plastics production process more efficient, stable and sustainable.

  Our polymer laminating and coating extrusion testing equipment adopts advanced electronic control technology and precision testing instruments, which can effectively simulate the actual production process, and realize the function of the coating thickness, tensile strength, compressive strength, elastic modulus, tear strength, wear resistance and other one-by-one tests. To provide more accurate and reliable data for the test and experiment of product materials.

  At Potop, we keep an eye on the latest developments in the industry and are committed to improving our own technology. I believe that with the further development of such technology, it will bring more possibilities and innovation to the entire industry.

Polymers Laminate And Coat Extrusion Testing Equipment

For more infomation:

David +8613632376303

Email:[email protected] /[email protected]
Feb 2024

Warm congratulations to Guangzhou POTOP Company for winning the 12th China Innovation and Entrepreneurship Competition (Guangdong · Guangzhou Competition area) high-end equipment manufacturing growth group award!


Guangzhou POTOP Film Bi-directional Stretching Test Line mainly consists of five-layer co-extrusion unit, casting machine, longitudinal stretching machine (MDO), transverse stretching machine (TDO), automatic winding unit, central control system and other parts. By simply adjusting the configuration, it is used for the research and development of new products of double-drawing films of different materials such as PP, PA, PE, PET, PLA, etc., as well as for the small-trial experiments and small-lot production sampling. More importantly, the process data obtained from the experimental line is directly used in the large production line, which greatly improves the production efficiency of the enterprise's new factory products.

Jan 2024

Good news! Good news! With the efforts of our R&D team, Guangzhou POTOP Double Stretching Line Project has now obtained the invention patent of "Orthogonal Film Transverse Stretching Device", thanks to the hard work of our R&D team!

Jan 2024

PLA Polylactic acid, also known as polylactide, belongs to the polyester family. PLA is a polymer obtained from the polymerization of lactic acid as the main raw material, the raw material source is sufficient and renewable, mainly corn, cassava and other raw materials. The production process of PLA is pollution-free, and the product can be biodegradable, realizing the cycle in nature, so it is an ideal green polymer material, PLA has many applications, can be used in extrusion, injection molding, film, spinning and other field.

About Us

During the past 20 years, POTOP has built an interdisciplinary engineering team of polymer rheologists, mechanical engineers, and electrical engineers and it has sold over 500 advanced machines to customers around the world, mainly universities and the research units of global chemical companies.


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