SINOPEC Baling Hunan SBS YH-803
- Product Name: SINOPEC Baling Hunan SBS YH-803
- Factroy Site: Yudu County, Ganzhou, Jiangxi, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- SINOPEC Baling Hunan SBS YH-803 is typically used in formulations when melt flow rate/styrene content and processing temperature/shear rate must be controlled within specific ranges.
| HS Code | 743569 |
| Product | SINOPEC Baling Hunan SBS YH-803 |
| Materialtype | Styrene-butadiene-styrene block copolymer (SBS) |
| Appearance | White or light-yellow porous pellets |
| Polymerstructure | Linear |
| Styrenecontent | 30% |
| Butadienecontent | 70% |
| Density | 0.94 g/cm³ |
| Bulkdensity | 0.35–0.45 g/cm³ |
| Meltflowrate | 0.5–5.0 g/10 min |
| Tensilestrength | ≥18.0 MPa |
| Elongationatbreak | ≥700% |
| 300 Modulus | ≥2.0 MPa |
| Permanentset | ≤30% |
| Shoreahardness | ≥70 |
| Volatilematter | ≤0.70% |
| Ashcontent | ≤0.20% |
As an accredited SINOPEC Baling Hunan SBS YH-803 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packed in 25 kg moisture-resistant woven bags with inner liners, palletized for industrial storage and transport. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with SINOPEC Baling Hunan SBS YH-803, packed in 25 kg bags, palletized, sealed for shipment. |
| Shipping | SINOPEC Baling Hunan SBS YH-803 is a non-hazardous styrene-butadiene-styrene block copolymer in solid pellet form, typically packed in 25 kg woven bags or jumbo bags. Not regulated for transport; keep cool, dry, ventilated, and protected from moisture, heat, and direct sunlight. Handle as ordinary polymer cargo; avoid bag damage. |
| Storage | Store SINOPEC Baling Hunan SBS YH-803 in a cool, dry, well-ventilated warehouse, protected from direct sunlight, rain, and moisture. Keep away from heat sources, ignition, oxidizers, acids, alkalis, and organic solvents. Maintain original sealed packaging, avoid heavy stacking or mechanical damage, follow first-in, first-out rotation, and observe shelf life. |
| Shelf Life | SINOPEC Baling Hunan SBS YH-803 typically has a 24-month shelf life when stored dry, cool, ventilated, and protected from sunlight and moisture. |
In road-paving binder applications, SINOPEC Baling Hunan SBS YH-803 is introduced into a 70/100 pen bitumen carrier at 4.0–5.5 wt% of total binder mass when the target performance envelope is PG 76-22 or PG 82-22 under AASHTO M320. The blending sequence on a production plant uses a rotor-stator high-shear mill or an inline low-clearance homogenizer with a tip speed above 18 m/s; the base bitumen is preheated to 170°C, the pelletized SBS is added over 5–10 min, and the batch is held at 180–185°C for 45–60 min until fluorescence microscopy shows a continuous SBS-rich network rather than isolated swollen particles. A 4.5 wt% addition typically raises the ASTM D36 softening point from 46–48°C to 82–86°C and reduces ASTM D5 penetration from 60–70 dmm to 40–50 dmm; elastic recovery under ASTM D6084 rises from 5–10% for base bitumen to 70–80%. The principal processing conflict is thermal: below 170°C swelling of the styrene domains is incomplete, while above 200°C the unsaturated butadiene midblock undergoes oxidative chain scission and the binder viscosity drops in a way that cannot be recovered by cooling. Asphalt terminals therefore keep the mixing vessel under a low positive nitrogen pressure and track motor torque as a proxy for network formation. Storage stability is a second cliff-edge: the ASTM D5976 separation difference between top and bottom softening points should remain below 2.5°C after 48 h at 160°C. The values below are representative of a single bitumen source and must be revalidated for each crude slate; published data for this specific configuration is limited.
| YH-803 addition (wt%) | Softening point ASTM D36 (°C) | Penetration 25°C ASTM D5 (dmm) | Elastic recovery ASTM D6084 (%) | Separation difference ASTM D5976 (°C) |
|---|---|---|---|---|
| 0 | 46 | 70 | 5 | 0 |
| 3.5 | 68 | 55 | 58 | 1.8 |
| 4.5 | 82 | 48 | 75 | 2.2 |
| 6.0 | 94 | 41 | 86 | 4.5 |
In dense-graded asphalt concrete and stone mastic asphalt, the modified binder is dosed at 5.5–6.5 wt% of mix; mixing in a twin-shaft pugmill occurs at 170–175°C for 30–40 s, paving temperature is maintained above 150°C, and breakdown compaction proceeds at 140–150°C. Terminal products include stone mastic asphalt wearing courses, porous friction courses, and bridge-deck waterproofing courses. Paraffinic flux oils with an aniline point above 85°C should be avoided because they selectively swell the butadiene midblock and increase phase separation; if the 135°C rotational viscosity per ASTM D4402 exceeds 3.0 Pa·s, the binder cannot be pumped through a standard bitumen line without a gear pump upgrade.
What Limits Low-Temperature Flexibility in SBS-Modified Waterproofing Membranes at 10–12 wt% YH-803?
When YH-803 is pre-swelled in oxidized bitumen for torch-applied and self-adhered roofing membranes, the formulation typically combines 10–12 wt% YH-803, 25–40 wt% ground limestone filler, 3–5 wt% naphthenic oil, and the balance oxidized bitumen with a ring-and-ball softening point of 85–95°C. Mixing is carried out in a vertical high-torque planetary mixer at 170–180°C for 40–50 min; the batch is discharged when a drawn film shows no visible SBS gel particles and the compound passes a cone-and-plate viscosity of 12–25 Pa·s at 160°C. On a 1200 mm working-width calender line, the hot compound is coated at 150–160°C onto a polyester carrier of 180–250 g/m² or a glass-fiber mat of 90–120 g/m², then immediately sanded, filmed, or mineral-chip finished at a nip pressure of 2–4 bar. Low-temperature flexibility per ASTM D5147-18 typically remains crack-free at -20°C on a 90° bend over a 10 mm mandrel; tensile strength per ASTM D638 ranges from 6–10 MPa in the machine direction. The limiting factor is oxidative aging: after 28 days at 70°C in a forced-draft oven, the cold-bend temperature can rise to 0°C unless the compound contains 0.3–0.5 wt% of a benzothiazole-based antioxidant. This is distinct from APP-modified membranes, which show better heat resistance but poorer elastic recovery. Below-grade and bridge-deck applications require the matrix below.
| Standard | Property | Typical target for YH-803 membrane |
|---|---|---|
| EN 13707 | Flexibility at low temperature | ≤ -15°C, no cracking |
| EN 13969 | Water absorption | ≤ 1.0 wt% |
| ASTM D6164 | Sheet thickness tolerance | ± 0.4 mm |
| ASTM D5147-18 | Low-temperature bend | -20°C pass |
| ASTM D638 | Tensile strength MD | 6–10 MPa |
For high-tack label and tape formulations, YH-803 is compounded in a sigma-blade kneader at 160–170°C under a nitrogen blanket with a mid-block-compatible C5/C9 hydrocarbon resin and a naphthenic process oil at a polymer:resin:oil mass ratio of 100:110:30 to 100:150:50. The polymer is melted alone for 10 min, resin is added in thirds over 15 min, and oil is introduced slowly over 20–30 min to avoid phase inversion. A slot-die coater applies 20–30 g/m² of adhesive at 160°C onto siliconized paper or 23 µm BOPP facestock. Loop tack under PSTC-16 is 3.0–5.0 N/25 mm, 180° peel under PSTC-101 is 6–10 N/25 mm after 24 h dwell on stainless steel, and shear adhesion failure temperature at 1 kg/25 mm × 25 mm overlap is 65–75°C. Indirect food-contact labeling relies on FDA 21 CFR 175.105; EU REACH SVHC screening and California Proposition 65 aromatic hydrocarbon limits also apply. Outdoor use requires 1.0–1.5 wt% hindered amine light stabilizer and a UV absorber because the unsaturated butadiene midblock yellows and loses tack after 500 h QUV exposure per ASTM G154. Rosin ester resins with an acid number above 1.0 mg KOH/g should be avoided because they catalyze scission of the butadiene midblock. Terminal products include permanent paper labels, clear polypropylene tapes, and diaper tape backings.
When Injection Molding EVA-Free Unit Soles Demands Low Warpage and Low Compression Set with Linear SBS
Injection molding of EVA-free unit soles uses a YH-803-based compound at 100 phr SBS, 30–50 phr general-purpose polystyrene, 20–40 phr white naphthenic oil, 10–20 phr ground calcium carbonate, 0.5–1.0 phr zinc stearate, and 0.3–0.5 phr hindered phenol/phosphite antioxidant. Compounding proceeds on a 75 mm co-rotating twin-screw extruder with L/D 44 and screw speed 300–400 rpm, using a temperature profile of 140/150/160/170/170/160°C and underwater strand pelletizing. Injection molding is performed on a 120-ton reciprocating-screw machine with screw L/D 20, compression ratio 2.2:1, barrel temperatures 160–180°C, mold temperature 30–40°C, injection pressure 60–80 MPa, hold pressure 40–50 MPa, and cooling time 20–30 s. Shore A hardness per ISO 868 is 55–65; tensile strength per ISO 37 is 8–12 MPa; 300% modulus is 2.0–3.0 MPa; compression set per ISO 815 at 23°C after 24 h at 30% deflection is 25–35%; DIN 53516 abrasion is 250–350 mm³. Polystyrene addition above 50 phr raises hardness but creates a distinct yield point and reduces flex crack resistance; below 30 phr, the melt becomes too elastic and the part sticks in the mold. Ozone resistance is poor because the butadiene midblock contains unsaturation; light-colored soles should not be loaded with staining antiozonants such as 6PPD. Compliance for European footwear includes REACH Annex XVII entry 50 PAH limits below 1 mg/kg per component and EU 1907/2006 registration. Terminal products are unit soles, slipper soles, and multi-layer sheet stock for die-cut insoles.
A Thermoforming-Grade PS/SBS Melt Blend for Reduced Brittle Fracture
On a 75 mm co-rotating twin-screw extruder with L/D 40, YH-803 is melt-blended into general-purpose polystyrene at 10–20 wt% with 0.1 wt% butylated hydroxytoluene or a hindered phenol antioxidant. The temperature profile from feed to die is 180/190/200/205/205/200°C, with vacuum devolatilization at -0.08 MPa to strip residual volatiles. The blend is then extruded into sheet of 1.0–2.0 mm thickness through a coat-hanger die onto a three-roll stack held at 60–80°C. Notched Izod impact strength per ISO 180/A rises from 2.0 kJ/m² for the base GPPS to 8–12 kJ/m² at 15 wt% YH-803; tensile strength per ISO 527-2 falls from 45 MPa to 32–38 MPa; Vicat softening temperature per ISO 306/B50 falls to 88–92°C. The processing window narrows above 20 wt% because melt strength drops and sheet sag in thermoforming becomes unacceptable without plug assist and zoned infrared heating at 140–160°C. Food-contact thermoformed trays and cups rely on FDA 21 CFR 177.1810 for styrene block copolymers and EU No 10/2011 overall migration below 10 mg/dm². Terminal products include clamshell inserts, disposable cups, and thin-wall trays where stress whitening and hinge fracture must be reduced. This configuration replaces a portion of K-resin or SBS block copolymer in dry blends; it does not provide transparency comparable to SBS resins because the GPPS continuous phase develops a slight haze above 10 wt% YH-803.
Production of bitumen-free automotive damping sheets uses a highly filled YH-803 compound delivered from a 55-liter internal mixer at 140–150°C with ram pressure 0.4–0.6 MPa, followed by a two-roll mill at 120°C and a calendering line to 1.5–3.0 mm sheet. A typical formulation is 100 phr YH-803, 200–400 phr barium sulfate, 100–200 phr calcium carbonate, 20–40 phr naphthenic oil, and 20–30 phr hydrocarbon resin. The compound is die-cut and heat-laminated to door inner panels or floor substrates. Density is 1.8–2.2 g/cm³; the loss factor at 20°C measured by ISO 6721 is 0.20–0.35; the burn rate per ISO 3795 is below 100 mm/min to satisfy FMVSS 302. VDA 278 VOC and FOG limits require the compound to be post-cured at 90°C for 4 h before shipment; failure to post-cure can cause fogging on windshield glass during cabin heat soak. Terminal products are door panel damping sheets, floor pan deadeners, and wheel arch liners.
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- SINOPEC Baling Hunan SBS YH-803 is manufactured under an ISO 9001 quality system and complies with relevant regulatory requirements.
- COA, SDS/MSDS, and related certificates are available upon request. For certificate requests or inquiries, contact: sales8@ascent-chem.com.
SINOPEC Baling Hunan SBS YH-803 is a linear styrene-butadiene-styrene triblock copolymer produced by anionic polymerisation and supplied as porous pellets. The grade carries a nominal bound styrene mass fraction of 30–32 wt% on the certificate of analysis, with the balance composed of a polybutadiene midblock of mixed 1,2/1,4 microstructure; this microstructure controls the glass transition of the soft phase and the response to sulfur-based crosslinking. The product is not oil-extended. That absence of extender oil distinguishes it from oil-filled SBS grades in the manufacturer’s portfolio and shifts final hardness and melt-flow control entirely to downstream compounding. Primary qualification targets are bitumen modification, hot-melt adhesive compounding, and polyolefin impact modification where a combination of low melt viscosity and elastomeric recovery is required. Incoming quality assurance generally includes melt mass-flow rate by ISO 1133-1:2022 at 200°C under a 5 kg load, volatile matter by ISO 248-1, ash by ISO 247, and tensile properties on compression-moulded sheets prepared according to ISO 23529.
Because the linear architecture has a relatively narrow molecular weight distribution, YH-803 exhibits lower hot-melt viscosity than radial SBS grades of similar bound styrene content. This property is advantageous in asphalt milling but reduces the maximum service stiffness after bitumen modification. Published data for YH-803 in fully specified performance-graded binder formulations is limited; formulation work should use the user’s specific base bitumen rather than a generic SBS dataset.
What Specification Values Govern YH-803 Qualification in Asphalt Modification?
| Property | Typical or specification value | Test method |
|---|---|---|
| Molecular architecture | Linear triblock | Anionic polymerisation product |
| Bound styrene mass fraction | 30–32 wt% | ISO 7270-2 |
| Tensile strength at break | ≥ 20 MPa | ISO 37 |
| Elongation at break | ≥ 700% | ISO 37 |
| Hardness | 80–86 Shore A | ISO 7619-1 |
| Melt mass-flow rate | 0.5–2.5 g/10 min | ISO 1133-1:2022, Procedure A, 200°C, 5 kg |
| Volatile matter | ≤ 1.0 wt% | ISO 248-1 |
| Ash | ≤ 0.2 wt% | ISO 247 |
Tensile and elongation are determined on compression-moulded sheets because injection-moulded specimens retain molecular orientation that gives artificially high tensile strength. Compression moulding at 150°C for 10 min followed by cooling at 15°C/min under pressure is used to avoid morphological anisotropy. The MFR window is intentionally broad; coupling efficiency after anionic polymerisation can vary between lots and affects the zero-shear viscosity more than the bound styrene ratio. For bulk silo deliveries, multi-point sampling during discharge is necessary because fines and densified pellets can stratify during pneumatic conveying; MFR and ash should be checked on each blend lot before the material is released to asphalt or adhesive production.
Compared with YH-792, a linear SBS grade with nominal bound styrene mass fraction near 40 wt%, YH-803 shifts the styrenic domain volume fraction downward. The practical consequence in bitumen modification is that YH-803 disperses at lower shear energy and produces lower high-temperature stiffness, whereas YH-792 contributes a higher softening point and higher tensile strength at equivalent dosage. In hot-melt adhesives, YH-803 has lower cohesive strength than YH-792 but can tolerate higher filler loading before melt viscosity becomes unmanageable. Published comparative dynamic shear data for these two grades in identical base bitumens are limited; selection is therefore made by performance-graded binder testing according to AASHTO M 332 and storage stability testing according to EN 13399, rather than by nominal styrene-to-butadiene ratio alone.
High-Shear Dispersion Equipment Limits and Storage Stability Criteria in Bitumen Modification
In bitumen modification, YH-803 is incorporated into paving-grade bitumen at 170–185°C using a high-shear mill or colloid mill. The dispersion window is narrow: if the bitumen temperature drops below 165°C, the polymer phase remains as discrete particles larger than 50 µm and the mixture does not develop the continuous polymer network that contributes elastic recovery; if the temperature exceeds 195°C, oxidative degradation of the polybutadiene midblock accelerates and the softening point can drift downward during prolonged storage. A rotor tip speed of 15–20 m/s in the high-shear zone is typical for initial polymer swelling and particle size reduction; the residence time in the mill must be sufficient to reduce the dispersed phase to below 10 µm. After milling, the mixture is transferred to a low-shear maturation tank for 30–90 min to complete swelling and phase inversion.
In plant-scale operation, a common failure mode is the formation of fisheyes when partially swelled polymer granules are pumped through a low-shear transfer pump before complete dispersion. The issue is mitigated by installing an in-line particle size analyser after the mill or by taking a smear sample every 30 min and inspecting under 100× optical magnification. Another batch-to-batch bottleneck is the change in base bitumen maltene content; asphaltene-rich bitumens can require a higher aromatic extender oil dose to achieve the same dispersed-phase size, and the resulting softening point must be re-established with each base bitumen lot.
Storage stability is assessed by EN 13399 after 72 h at 180°C; the difference between softening points of the top and bottom thirds is commonly specified below 2.5°C in European polymer-modified bitumen specifications. If this criterion is exceeded, the formulation may require addition of an aromatic-rich extender oil or sulfur-based crosslinking at 0.1–0.2 wt%. Sulfur accelerates vulcanization-like crosslinking in the polybutadiene domains and increases viscosity; overdosing above 0.3 wt% may produce gel bodies and an unacceptably high elastic modulus. Dynamic viscosity at 135°C is measured with a rotational viscometer according to ASTM D4402; a working viscosity below 3 Pa·s is generally required for pumping, but this target is a system property of the polymer-modified bitumen and not of YH-803 alone.
Rheological acceptance of the finished polymer-modified bitumen uses the dynamic shear rheometer according to AASHTO T 315 on original, rolling-thin-film-oven-aged, and pressure-aging-vessel-aged binder. The SBS phase modifies the loss tangent and increases elastic recovery. Multiple stress creep recovery per AASHTO T 350 at 64°C provides non-recoverable creep compliance and percent recovery; the result is lot-dependent and must be verified with the local base bitumen because the saturate/aromatic balance controls maltene compatibility. Published data for YH-803 in fully specified performance-graded formulations is limited; binder suppliers perform pre-qualification with the exact bitumen source and aggregate type rather than relying on generic SBS data.
If Polyolefin Blends Require Impact Modification at Sub-Ambient Temperatures
Compounding of YH-803 into polypropylene impact copolymers is carried out on a co-rotating twin-screw extruder with L/D of at least 40:1 and vacuum venting. The pellets are pre-dried at 60°C for 2 h if stored above 60% RH, to reduce surface moisture that contributes to melt-phase foaming and to avoid hydrolytic degradation of silane-grafted coupling agents. Addition levels of 5–15 wt% are common for refrigerator components and automotive interior panels requiring ductile behaviour at -20°C. Notched Izod impact strength is measured by ISO 180/A; dispersion is considered adequate when cryofracture scanning electron microscopy shows rubber particles below 5 µm. Published data for YH-803-specific polypropylene formulations is limited; the ratio of tensile modulus loss to low-temperature impact improvement should be established on the production extruder with the exact polypropylene grade.
In hot-melt adhesives, YH-803 is melt-blended with C5 hydrocarbon tackifiers and naphthenic process oil in a sigma-blade mixer at 150–170°C. The tackifier loading must be adjusted because the linear SBS midblock has limited oil extension capacity before phase separation; formulations exceeding 60 phr of low-aromatic oil typically show surface tack transfer and loss of cohesive strength. Peel adhesion is tested by ASTM D1876 at 180° angle, and heat resistance is reported as shear adhesion failure temperature. For shoe soling, the compound is often blended with general-purpose polystyrene to increase hardness at the expense of elongation. All compounds should avoid primary or secondary amine-based additives because they can catalyse thermal-oxidative degradation of residual unsaturation in the polybutadiene block and shorten the shelf life of the melt.
Relative to styrene-ethylene-butylene-styrene elastomers, YH-803 contains residual unsaturation in the butadiene midblock. This makes it more susceptible to oxidative degradation during prolonged high-temperature exposure but permits sulfur or peroxide crosslinking and improves compatibility with aromatic bitumen components. Selection of YH-803 over hydrogenated styrenic block copolymers for hot-melt adhesives is therefore driven by lower melt viscosity and lower raw-material cost, not by long-term thermal-aging performance; for continuous service above 100°C, hydrogenated SEBS grades should be evaluated.
Pellets are stored below 40°C in original packaging and protected from sunlight and moisture. Prolonged storage above 35°C can cause blocking due to elastomer cold flow; blocking does not affect specification properties but may require pre-crushing before pneumatic conveying. If bags are opened in an environment above 60% RH, moisture uptake should be checked by ISO 248-1 before hot-melt processing because absorbed moisture causes bubbles in extruded profiles and can hydrolyse ester-based coupling agents in compounded formulations. From a regulatory standpoint, industrial use in the EU requires REACH registration; the supplier’s safety data sheet states whether the grade is registered and whether any SVHC declaration applies. The grade is not generally supplied with food-contact 21 CFR 177.2600 clearance; hydrogenated styrenic block copolymer alternatives should be evaluated for repeated-use food-contact elastomer parts.
