SEPS YH-4030 is a hydrogenated styrene-isoprene block copolymer supplied as a white powder. Recognized for its rapid dissolution, strong thickening capacity, and exceptional shear resistance, YH-4030 serves as a premium viscosity index (VI) improver for lubricating oils. It significantly enhances viscosity-temperature performance, low-temperature fluidity, and shear stability, meeting the demanding requirements of multi-grade internal combustion engine oils—particularly long-drain multigrade engine oils.
Product Name: Styrene Ethylene Propylene Styrene Block Copolymer (SEPS)
Grade: SEPS YH-4030
Structure: Radial
SEPS YH-4030 Technical Data:
| Items | Index |
| Appearance | White Powder |
| SM Content | 5 % |
| Volatile Matter | ≤ 1.0 wt% |
| Di-block Content | / |
| Dropping Point | / |
| Thickening Ability | 6-8 % |
| Shear Stability Index (100℃) | 13 mm2/s |
| Hydrogenation Degree | 98 % |
| Nickel residue | 13 mg/kg |
Applications:
Index Improver for Lubricating Oil: Radial multi-arm structure optimized for use as an efficient viscosity index improver in lubricating oil formulations, ensuring stable shear resistance across wide temperature ranges.
Package:
13kg PE bag.
Storage:
Store in a cool, dry, and well-ventilated area, away from direct sunlight, heat sources, or open flames. Keep containers tightly sealed to prevent contamination, moisture absorption, or contact with strong oxidizing agents. Please handle and use in accordance with standard safety guidelines. Proper storage ensures prolonged product shelf life and maintains material integrity.
Styrene-Ethylene-Propylene-Styrene (SEPS) block copolymer is a hydrogenated styrene block copolymer (HSBC) belonging to the thermoplastic elastomer (TPE) family, represented by the general formula S-EP-S. In its molecular architecture, the terminal polystyrene (PS) blocks act as physical cross-links through microphase separation, while the central ethylene-propylene (EP) copolymer block imparts rubbery elasticity to the polymer matrix.
SEPS YH-4010 is a 100% diblock copolymer primarily utilized as a gelling agent for hydrophilic thixotropic fiber-filling ointments, as well as a thickener for cosmetic white oils and moisturizing ointments. YH-4010 offers stable physicochemical properties, excellent viscosity-temperature behavior, low oil-separation tendencies, and smooth pumpability.
SEPS YH-4020 is a 100% diblock copolymer engineered as a high-performance gelling agent for optical fiber and cable filling ointments, effectively sealing interstitial voids in multi-core cables. The resulting filling ointment exhibits a high melting point, optimal viscosity, superior low-temperature flexibility, excellent thermal stability, and robust water resistance. Additionally, it features high electrical insulation, low dielectric loss.
SEPS YH-4030 is a hydrogenated styrene-isoprene block copolymer supplied as a white powder. Recognized for its rapid dissolution, strong thickening capacity, and exceptional shear resistance, YH-4030 serves as a premium viscosity index (VI) improver for lubricating oils. It significantly enhances viscosity-temperature performance, low-temperature fluidity, and shear stability, meeting the demanding requirements of multi-grade internal combustion engine oils—particularly long-drain multigrade engine oils.
Sinopec SEPS YH-4051 is a transparent linear triblock copolymer based on styrene-ethylene-propylene monomers with a bound styrene content of 30%. Compared to SEBS, YH-4051 demonstrates faster oil absorption rate, lower surface tackiness post-oil extension, higher tensile strength and hardness, lower permanent set, and excellent adhesion to diverse polar and non-polar substrates.
Sinopec SEPS YH-4052 is a versatile linear block copolymer engineered with medium molecular weight, offering broad polymer compatibility. It blends seamlessly with polyolefins and engineering plastics such as PP, PE, ABS, and EVA, delivering excellent interfacial adhesion, mechanical flexibility, and processing adaptability for high-performance compounds and modified resins.
Sinopec SEPS 4053 is a high molecular weight hydrogenated styrene-isoprene-styrene triblock copolymer supplied as a coarse white powder. Being amorphous and non-crystalline, SEPS 4053 exhibits superior softness, elasticity, and lower hysteresis behavior compared to partially crystalline SEBS polymers.
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