This document will explore the properties, advantages, applications, processing methods, and provide a comprehensive Technical Data Sheet (TDS). Designed to meet the demands of industries such as chemical processing, marine, 汽车， 和 infrastructure, paraphthalic resin is the material of choice when longevity and resistance to extreme environments are essential.

2. What is Paraphthalic Unsaturated Polyester Resin?

Paraphthalic UPR is a thermosetting resin derived from terephthalic acid 或者 dimethyl terephthalate (DMT), which is reacted with glycols such as propylene glycol 或者 neopentyl glycol 和 maleic anhydride. It contains unsaturated double bonds that allow cross-linking with monomers like styrene during curing, forming a three-dimensional network with high structural integrity.

What makes paraphthalic resin unique is its benzene ring structure in the para position, which confers rigidity and thermal resistance. This molecular arrangement makes P-UPR one of the most durable and stable resins available within the unsaturated polyester family.

3. Key Features and Benefits

✅ Outstanding Chemical Resistance

Tolerates prolonged exposure to acids, alkalis, salts, and a variety of organic solvents.

✅ Exceptional Mechanical Properties

High tensile, flexural, and impact strength ideal for structural and load-bearing applications.

✅ Superior Thermal Stability

Heat resistance up to 160°C with special formulations.

✅ Enhanced Weathering Resistance

Performs well under UV radiation, freeze-thaw cycles, and high humidity environments.

✅ Long Service Life

Designed for applications demanding 20+ years of durability.

✅ Excellent Compatibility with Reinforcements

Bonds exceptionally well with glass, aramid, and carbon fiber for high-strength composites.

4. Common Applications

Paraphthalic UPR is used across a wide range of industries that demand high-performance, corrosion-resistant composite materials.

5. Processing Characteristics

Paraphthalic UPR is suitable for various fabrication processes. It is often supplied as a pre-promoted system but may also be modified to suit specific production techniques.

Curing Agents:

Paraphthalic resins cure with MEKP, BPO， 或者 AIBN, often in conjunction with cobalt accelerators.

凝胶时间:

Adjustable between 8–25 minutes depending on application and catalyst system.

6. Technical Data Sheet (TDS)

Below is a representative TDS. The actual properties may vary depending on the manufacturer or the specific formulation.

📌 Liquid Resin Properties

🔧 Cured Resin Mechanical Properties

🌡️ Thermal and Chemical Resistance

7. Storage Guidelines

To maintain the shelf life and quality of paraphthalic resin:

• Store in sealed containers between 15–25°C.

• Avoid direct sunlight, moisture， 和 excess heat.

• Use within 6 months of manufacture date.

• Agitate before use to ensure uniformity.

8. Safety Precautions

• Follow MSDS recommendations.

• Keep away from open flames 和 heat sources.

• Avoid inhalation of styrene fumes; use in ventilated areas.

• Wear appropriate PPE—gloves, goggles, and a respirator if needed.

• Dispose of unused material in accordance with local regulations.

9. Packaging Options

Paraphthalic UPR is supplied in:

10. Summary and Conclusion

Paraphthalic Unsaturated Polyester Resin stands out as a top-tier resin system for advanced composite applications. Its performance benefits over traditional ortho- and isophthalic resins include:

• Enhanced resistance to corrosive environments.

• Long-term thermal and UV stability.

• Structural reliability in demanding mechanical applications.