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How much do you know about unsaturated polyester resin(upr)?
 Dec 06, 2023|View:648

What is unsaturated polyester resin(upr)


Unsaturated Polyester Resin (UPR) is a synthetic resin characterized by its molecular structure containing unsaturated double bonds. This unsaturation imparts excellent malleability and reactivity to the resin, making it widely utilized in diverse industrial and manufacturing applications.

Typically produced through polymerization reactions, not fully saturated monomers (often unsaturated diols and acidic diacids) are mixed with initiators and stabilizers to form a cross-linked structure. This cross-linking provides unsaturated polyester resin with outstanding mechanical properties, chemical stability, and corrosion resistance.

Unsaturated Polyester Resin plays a significant role in construction and aerospace applications.

Unsaturated Polyester Resin plays a significant role in both construction and aerospace industries. In construction, it is commonly used as a versatile material for various applications, including laminating and reinforcing structures. In aerospace, Unsaturated Polyester Resin is utilized for its lightweight and durable properties, contributing to the manufacturing of components that require a balance of strength and reduced weight, such as aircraft components and spacecraft structures.

Types Of UPR

Unsaturated Polyester Resin (UPR) is a common type of polymer material, mainly used to prepare composite materials, glass fiber reinforced plastics (GRP), etc. According to different ingredients and uses, unsaturated polyester resin can be divided into the following types:

1.Hand lay-up General purpose

Flame retardant resin (Flame Retardant Resin) is a polymer material with flame retardant properties that is designed and prepared to slow down or prevent the material's ability to burn under fire conditions.

2.Lamininate resin

"Laminate resin" generally refers to the resin used to prepare laminates, which are often used in the manufacture of composite materials. Laminates are made by stacking multiple thin layers (usually fiber-reinforced materials such as fiberglass cloth) alternating with layers of resin.

2. Chemical resistant resin

Chemical Resistant Resin is a type of high-performance polymer material that can resist chemical erosion. These resins show good resistance to corrosive chemicals and are often used to manufacture equipment, pipes, containers and components in chemical processes that need to resist the attack of acids, alkalis, solvents and other chemicals.

3. Marine resin

"Marine resin" refers to resin specifically used in the manufacture of ships and ship components. These resins often require a range of special properties to cope with the extreme conditions found in marine environments such as seawater, UV exposure, and salt spray.

4.orthophthalic resins

Orthophthalic resins (orthophthalic ester resins, also known as general unsaturated polyester resins) are a major type of unsaturated polyester resins and are widely used in the preparation of composite materials, glass fiber reinforced plastics (GRP), etc. This resin is popular for its relative affordability, ease of processing, and wide adaptability.

Application of Unsaturated Polyester Resin (UPR)

Due to its versatility, unsaturated polyester resin has a wide range of applications in a variety of fields. These include but are not limited to:

Building and Construction:


Used in the manufacture of building components, waterproofing materials and composite materials.



Unsaturated polyester resins are often used as the basis for composite materials in the manufacture of lightweight structures and aircraft components.

Automotive Manufacturing:


Used in the manufacture of body parts, skins and other structural materials.

Electronic equipment:


Applications in electronic insulation materials and enclosures.

Our strength in producing Unsaturated Polyester Resin

The annual production capacity from our company is of 50000 tons of fiberglass, 100000 tons of up resin accessoty; 20000 tons of various kinds of FRP products; 20000 tons of various kinds of adhesive; 30 million of wall covering. Acrylic resin 5000tons,10000tons of hydroxy esters.


As we delve into the realm of Unsaturated Polyester Resin (UPR), it becomes evident that this remarkable synthetic material stands at the forefront of innovation and versatility. Its unique molecular structure, characterized by unsaturated double bonds, empowers it with exceptional pliability and reactivity, making it a key player across diverse industrial domains.

In this blog journey, we've explored the fundamental concept of UPR, unraveling its synthesis through polymerization reactions and the creation of a cross-linked structure. This cross-linking not only imparts outstanding mechanical properties but also elevates its chemical stability and resistance to corrosion.

From the towering structures in construction to the soaring heights of aerospace engineering, UPR's influence is pervasive. In construction, it shapes decorative elements, reinforces waterproof materials, and forms the backbone of lightweight yet robust composite structures. Simultaneously, in aerospace, it contributes to the realization of lightweight components, aids in crafting high-strength composite materials, and excels in enduring harsh environmental conditions.

The classifications we've explored, whether in the construction sector or aerospace industry, underscore the adaptability of UPR. Its vibrant role as a material of choice for artists, designers, engineers, and manufacturers alike showcases its ability to bridge the realms of artistry and engineering.

In conclusion, Unsaturated Polyester Resin emerges not just as a material but as an enabler of possibilities. Its impact resonates across disciplines, fostering creativity in design, driving efficiency in construction, and pushing the boundaries of aerospace technology. As we celebrate the multifaceted nature of UPR, we anticipate continued breakthroughs and advancements, further solidifying its position as a cornerstone in materials science and industrial innovation.

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    Tianma Group Corp is engaged in research on fiberglass/composite material products and related technologies, and has won multiple national, provincial, and municipal level scientific and technological progress awards. Based on this, the company implements a technological innovation strategy, actively cooperates with domestic and foreign research institutes, targets and tracks international market trends, continuously develops new products with independent intellectual property rights, and enhances core competitiveness.

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