Kumho Petrochemical KTR® SBS 201
- Product Name: Kumho Petrochemical KTR® SBS 201
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Kumho Petrochemical KTR® SBS 201 is typically used in formulations when styrene content and melt flow rate and processing temperature and shear rate must be controlled within specific ranges.
| HS Code | 454781 |
| Structure | Linear SBS |
| Styrenecontent | 30 wt% |
| Butadienecontent | 70 wt% |
| Appearance | White crumb |
| Density | 0.94 g/cm³ |
| Bulkdensity | 0.40 g/cm³ |
| Meltflowrate | 5 g/10 min (200°C/5 kg) |
| Shoreahardness | 70 |
| Tensilestrength | 25 MPa |
| Elongationatbreak | 700% |
| Volatilematter | ≤0.5 wt% |
| Ashcontent | ≤0.2 wt% |
As an accredited Kumho Petrochemical KTR® SBS 201 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Kumho Petrochemical KTR® SBS 201 is supplied in 25 kg moisture-proof paper bags, palletized for safe industrial storage and handling. |
| Container Loading (20′ FCL) | Kumho Petrochemical KTR® SBS 201 is palletized, wrapped, and securely loaded into a sealed 20-foot FCL container for shipment. |
| Shipping | Kumho Petrochemical KTR® SBS 201 is shipped as a non-hazardous thermoplastic elastomer in moisture-resistant 25 kg bags or jumbo bags, palletized and stretch-wrapped. Store and transport in a cool, dry area away from direct sunlight, heat, and moisture. Not classified as dangerous goods for transport. |
| Storage | Store Kumho Petrochemical KTR® SBS 201 in a cool, dry, well-ventilated area away from direct sunlight, heat, ignition sources, and oxidizing agents. Keep in original, closed packaging on pallets; protect from moisture, dust, and UV exposure. Avoid excessive stacking or prolonged high temperatures to prevent agglomeration or deformation. Maintain good housekeeping and follow local regulations. |
| Shelf Life | Store in a cool, dry place in original sealed packaging; shelf life is typically 24 months from date of manufacture. |
When 31 wt% styrene blocks control bituminous phase inversion
Road-paving formulations based on KTR SBS 201 are compounded into paving-grade bitumen at 3.0–5.5 wt% of total binder mass for dense-graded and gap-graded asphalt courses. Below 3 wt%, the styrene-rich domains do not form a continuous load-bearing network, and permanent deformation resistance at 60°C remains insufficient for heavy-traffic intersections. Above 5.5 wt%, the binder enters a high-viscosity regime in which storage stability declines and phase separation can occur during static tank storage at 160–180°C. The polymer is disintegrated into bitumen using a rotor-stator high-shear mixer with tip speed 15–20 m/s at 175–185°C; mixing time is 30–45 min, followed by low-shear maturation for 2–4 h. Temperature control is the critical process limit: sustained exposure above 190°C initiates polybutadiene midblock chain scission, reducing elastic recovery. Production-scale storage tanks require slow agitator rotation and nitrogen blanketing to prevent surface skinning and oxidative gel accumulation at the tank wall.
| Standard designation | Test parameter | Specification window |
|---|---|---|
| ASTM D36-14 | Ring-and-ball softening point | ≥60°C for rutting-resistant polymer-modified binders |
| ASTM D5-19 | Needle penetration at 25°C | 45–80 dmm depending on climate designation |
| ASTM D6084-18 | Elastic recovery at 25°C | ≥70% for continuous-elastomer-network PMBs |
| AASHTO M320-17 | Performance-graded binder classification | High-temperature PG grade selected by project climate |
Compliance for polymer-modified asphalt used in public roadways is established under EN 14023 and ASTM D5976, with binder homogeneity and thermal stability verified during the design phase. The downstream process converts the modified binder through conventional hot-mix asphalt plants producing dense-graded asphalt concrete, gap-graded stone mastic asphalt, and stress-absorbing membrane interlayers. Finished terminal products include highway wearing courses, airport taxiway pavements, bridge deck underlayments, and heavy-duty intersection overlays where rutting resistance and low-temperature cracking resistance are simultaneously required.
Hot-melt pressure-sensitive adhesive compounding with KTR SBS 201 is performed in sigma-blade kneaders under nitrogen blanketing at 160–175°C. The oxidative gel point rises rapidly above 180°C; production lines with residence time exceeding 90 min exhibit batch-to-batch viscosity drift and filter-plugging gel fines in downstream coaters. The addition ratio is 18–30 wt% of total adhesive solids, balanced against 45–60 wt% hydrogenated or partially hydrogenated tackifier resins, 10–25 wt% naphthenic processing oil, and 0.5–1.0 wt% hindered phenol antioxidant. The melt is discharged through 200–300 μm slot dies onto silicone-coated release liners; coating speeds above 120 m/min require viscosity below 20,000 mPa·s at 175°C. Regulatory compliance for food-contact incidental contact is evaluated under FDA 21 CFR 175.105, with tack, peel, and viscosity tested per ASTM D6195, ASTM D903, and ASTM D3236. Terminal product types include packaging tapes, masking tapes, label stocks, and hygiene construction adhesives. Published data for KTR SBS 201 in high-speed sprayable packaging adhesives is limited; high melt viscosity restricts use to slot-die and roller coating rather than fiberized spray deposition.
What prevents melt fracture in TPR sole compounds at oil loadings above 40 phr?
Thermoplastic rubber sole compounds based on KTR SBS 201 are formulated at 45–60 phr with 30–50 phr paraffinic or naphthenic oil, 10–20 phr general-purpose polystyrene, and 5–15 phr calcium carbonate. The oil-absorption limit is the main formulation boundary: above 50 phr, tensile strength falls below 5 MPa and DIN abrasion loss rises above 250 mm³, making the compound unsuitable for safety footwear. Compounding is carried out on counter-rotating twin-screw extruders with L/D 36:1 at 160–190°C, pelletizing under water-ring cooling. Injection molding of soles uses barrel temperatures 170–190°C, mold temperatures 25–40°C, injection pressure 70–100 MPa, and clamp force 80–150 t for multi-cavity sole molds. Melt fracture is avoided by maintaining screw speeds below 200 rpm; higher shear rates produce extrudate surface melt fracture and unacceptable weld-line appearance in direct-injection machines. Safety footwear verification follows ISO 20345:2021, with abrasion tested per ISO 4649 and tensile properties per ASTM D412-16. Terminal finished products include direct-injected unit soles, cup soles, sport shoe outsoles, midsole components, and safety footwear sole assemblies. Published shear-viscosity data for KTR SBS 201 at processing shear rates above 10³ s⁻¹ is limited; processors therefore establish machine-specific melt-temperature windows rather than relying on standardized MFR values alone.
Torch-applied and self-adhered SBS-modified bituminous membranes require a continuous elastomer network that retains flexibility at −10°C to −20°C. KTR SBS 201 is incorporated at 10–14 wt% of the bitumen compound for cap sheets, while interply products may use 6–9 wt%. Bitumen is dehydrated at 130–140°C, heated to 175–185°C, and mixed under high shear until the SBS phase is fully dispersed; powdered mineral filler is introduced only after elastomer dispersion is complete. Membrane production lines calender or impregnate the compound at 160–170°C onto polyester or glass-fiber reinforcement, followed by PE film surfacing or mineral-granule embedding. Compliance is assessed under EN 13707:2004+A1:2008 for roofing membranes, with tensile properties tested per EN 12311-1 and low-temperature flexibility per EN 1109. The compounded melt reaches 3–5 Pa·s at 180°C, and exposure above 190°C causes chain scission that appears as reduced elongation in finished membranes. Terminal product types include roofing cap sheets, bridge deck waterproofing layers, foundation waterproofing membranes, and tunnel lining membranes. Processors using high-shear mixers without horizontal kneader secondary dispersion report filler agglomerates at filler loadings above 30 wt%, which reduce low-temperature crack-bridging capacity.
Assessing low-temperature impact modification of recycled polypropylene
KTR SBS 201 is let down into recycled polypropylene at 5–12 wt% through co-rotating twin-screw extrusion with L/D 40:1. The SBS phase is side-fed after the PP melt reaches 200–220°C; pelletizing is performed with air cooling because water-ring cooling can trap moisture at pellet surfaces. Pre-drying at 70°C for 2 h is required when ambient relative humidity exceeds 60%. Injection molding uses barrel temperatures 220–240°C and mold temperatures 30–40°C. The dispersed SBS particle size is controlled by screw speeds of 250–350 rpm; lower speeds produce particles larger than 2 μm, reducing notched impact efficiency, while higher speeds create excessive melt shear heating. Compliance testing includes Izod impact per ISO 180-1:2019, melt mass-flow rate per ISO 1133-1:2022, and ASTM D256 for comparative data. Finished products include appliance housings, battery cases, and automotive interior carrier parts. The unsaturated polybutadiene midblock limits outdoor UV resistance; long-term outdoor use requires a HALS-based stabilizer package and carbon black loading above 2 wt%. Published data for KTR SBS 201 in transparent PP copolymers is limited due to refractive-index mismatch and the resulting haze.
Recoverable deflection under static load in filled SBS 201 pads
Anti-vibration pads are compounded with KTR SBS 201 at 30–45 wt%, mineral fillers at 40–60 wt%, and plasticizer at 10–20 wt%. The filler ceiling is 60 wt%; beyond this level, tensile and tear strength decline sharply, and the compound cannot be calendered into uniform sheet. Mixing is performed in a tangential internal mixer at rotor speed 40 rpm, with oil addition staged after polymer fusion. Calendering at 150–165°C produces roll goods, while thicker pads are compression molded at 160–180°C under 10–15 MPa for 6–10 min. Compression set is measured per ISO 1856:2018, and dynamic mechanical analysis per ISO 6721-1 verifies loss factor above 0.20 in the 20–60°C service interval. Terminal product types include machine mounts, flooring underlay sheets, and automotive acoustic deadening pads. Filled SBS 201 compounds exhibit higher compression set than vulcanized rubber, but the calendered process yield and recyclability provide manufacturing advantages for medium-load anti-vibration applications.
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- Kumho Petrochemical KTR® SBS 201 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.
Kumho Petrochemical KTR® SBS 201 is a linear styrene-butadiene-styrene triblock copolymer supplied as an opaque pellet. The grade is manufactured without paraffinic or naphthenic oil extension. The polymer contains a bound styrene content of approximately 31 wt% and a polybutadiene midblock that remains unsaturated, so the material combines thermoplastic processability with elastomeric recovery after melt processing. At service temperatures below the polystyrene domain glass transition temperature of about 95°C, the styrene end blocks phase-separate into rigid domains that act as physical crosslinks. This permits injection molding, extrusion, calendering, and solvent dissolution without sulfur vulcanization in many applications. Typical application fields include footwear unit soles, asphalt binder modification, solvent-based pressure-sensitive adhesives, sealants, and impact modification of styrenic compounds. Because KTR® SBS 201 is not oil-extended, the formulator retains control over total plasticizer loading and compound hardness; this distinguishes the grade from oil-extended SBS products that supply 30–50 phr process oil in the pellet. The following typical property ranges are derived from manufacturer technical literature and are not specification limits; production-lot certificates of analysis control bound styrene, melt flow rate, and volatile matter.
| Property | Typical value or range | Test method |
|---|---|---|
| Bound styrene content | 30–32 wt% | Manufacturer FTIR method; ISO 21561:2005 |
| Specific gravity | 0.93–0.95 | ASTM D792-20 |
| Melt flow rate | 4.0–6.0 g/10 min (200°C, 5 kg) | ISO 1133-1:2022 |
| Hardness | 74–78 Shore A | ASTM D2240-15 / ISO 868:2003 |
| Tensile strength | 18.0–22.0 MPa | ISO 37:2017 |
| Elongation at break | 650–750 % | ISO 37:2017 |
| 300% modulus | 2.0–3.0 MPa | ISO 37:2017 |
| Tear strength | 30–40 kN/m | ASTM D624-20 Die C |
| Volatile matter | ≤0.5 % | ISO 248-1:2021 |
| Total ash | ≤0.2 % | ISO 247:2006 |
Melt flow rate and bound styrene are the two primary specification variables. A shift in bound styrene outside the 30–32 wt% interval changes the effective crosslink density of the styrenic domains and alters the balance between hardness and low-temperature flexibility. A melt flow rate below 4.0 g/10 min may cause difficulty filling thin-walled cavities below 1.5 mm, while a value above 6.0 g/10 min may reduce compound tensile set and increase tack in pellet handling. These values are measured on virgin pellets and do not predict the final hardness of compounds containing plasticizers, fillers, or polystyrene.
Melt Processing Window and Shear History Constraints in Compounding
Compounding KTR® SBS 201 in a co-rotating twin-screw extruder requires control of specific energy input below the threshold that triggers shear-induced temperature rise in the polybutadiene phase. For a 40:1 L/D machine with 11 barrel zones, a barrel set-point profile from 150°C to 180°C and a die set point of 175–190°C are commonly reported. Melt temperatures above 200°C produce gel bodies from thermal oxidative degradation of the unsaturated midblock and should be avoided. The grade is pelletized and typically contains a low-dusting external release agent; pre-drying at 60–70°C for 2 hours in a desiccant dryer with a dew point below −20°C is recommended after exposure to relative humidity above 60%. Screw speed should be maintained between 250 and 350 rpm on a 40 mm to 70 mm diameter machine. Below this range, distributive mixing of the high-viscosity styrene domains is incomplete; above this range, melt temperature excursions above 205°C can occur at throughputs exceeding 450 kg/h in production-scale lines. Published grade-specific capillary shear-viscosity data are limited, but process engineering practice for linear SBS with similar bound styrene content uses atmospheric venting and injection of paraffinic or naphthenic oil after the first intensive mixing zone to prevent oil slip at the feed throat. If oil is added at the feed throat at loadings above 30 phr, screw slip and feed-section hold-up have been observed on production twin-screw equipment.
In footwear compounding, KTR® SBS 201 is typically formulated with 30–60 phr paraffinic or naphthenic process oil, 5–15 phr polystyrene for hardness adjustment, and 0.2–0.5 phr phenolic antioxidant. The hardness after injection molding at 160–185°C barrel temperature and 30–45°C mold temperature ranges from approximately 55 Shore A at high oil loading to 75 Shore A at low oil loading. Tensile strength and elongation are evaluated under ASTM D638-14 on Type IV die-cut specimens; compression set is measured according to ASTM D395-21, Method B, after 22 hours at 70°C. If the mold cavity contains sharp transitions or deep reinforcing ribs, nozzle melt temperature should not exceed 195°C; higher temperatures reduce melt viscosity sufficiently to fill thin sections but accelerate midblock oxidation and increase the incidence of short shots caused by premature gelation in the hot runner. Microcellular sole expansion requires a chemical blowing agent activation window of 165–185°C; azodicarbonamide grades that release gas below 160°C are not recommended because nucleation occurs before melt strength develops.
What Limits Asphalt Binder Compatibility and Storage Stability in High-Temperature Mixing?
KTR® SBS 201 can be dispersed into paving-grade asphalt at 4–6 wt% using a high-shear rotor-stator mill at 175–185°C for 45–60 minutes. The key process limit is the competition between polymer swelling in the maltene fraction and thermal chain scission; if the mix temperature exceeds 195°C, the polybutadiene midblock degrades, and the softening-point increase under ASTM D36-14 may fall below the target range. Laboratory storage-stability tests based on EN 13399:2017 can be used to evaluate phase separation after 3 days at 180°C. Published data for this specific grade in low-temperature bending-beam rheometry are limited; producers should validate the performance grade via AASHTO M 320 protocols with the specific base binder. In field-scale trials, the grade is typically introduced after the base asphalt is heated to 175°C, and high-shear mixing continues until a fluorescent microscopy sample shows no polymer-rich phase above 10 µm particle size. The unsaturated midblock also requires the modified binder to be stored under inert gas if held at 180°C for more than 12 hours to prevent oxidative viscosity drift.
For solvent-based pressure-sensitive adhesives, KTR® SBS 201 is dissolved at 20–35 wt% solids in toluene or cyclohexane/ethyl acetate blends. Brookfield viscosity at 25°C after dissolution at 30 wt% solids is typically between 1,500 and 3,500 mPa·s when measured under ISO 2555:2018. The linear architecture permits faster dissolution and lower solution viscosity than radial SBS grades of comparable styrene content. Tackifier compatibility is limited to C5 and C9 hydrocarbon resins with softening points between 90°C and 110°C; rosin ester tackifiers above 20 phr may reduce shear adhesion failure temperature. Peel strength of coated films is evaluated under ASTM D3330/D3330M-04(2020) Test Method A. Because the midblock is unsaturated, adhesive formulations require an antioxidant package and should not be specified for continuous outdoor exposure without UV stabilizers. The grade is not recommended for anaerobic or chemically crosslinked adhesive systems where the unsaturated midblock could participate in premature oxidative gelation.
When a Linear Non-Oil-Extended SBS Is Substituted for a Radial or Hydrogenated Grade
The primary structural difference is that KTR® SBS 201 is linear and non-oil-extended. Radial SBS grades of similar styrene content have higher melt viscosity and higher hot green strength; they are sometimes preferred for high-oil-content compounds that require low extrusion swell. KTR® SBS 201 has lower solution viscosity and easier dissolution in solvent-based adhesive mixing, as well as higher melt flow for injection molding thin sections. Compared with hydrogenated styrene-ethylene/butylene-styrene block copolymers, KTR® SBS 201 exhibits lower thermo-oxidative resistance because the polybutadiene midblock is unsaturated. Continuous service temperature is therefore limited to approximately 80°C in load-bearing applications and 100°C in non-load-bearing formulations. Steam sterilization or repeated hot-water exposure above 80°C reduces tensile properties and should not be specified. When replacing an oil-extended SBS, the formulator should add process oil separately; the total oil should include the amount previously contained in the oil-extended pellet plus any compounding oil, and the oil should be paraffinic or naphthenic with aromatic content below 5%. Aromatic oils plasticize the styrene domains and reduce hardness retention and tensile set. The grade is not intended for direct food contact unless the specific fabricated article meets the end-test criteria of FDA 21 CFR 177.2600 and any applicable migration limits under EU Regulation (EU) No 10/2011.
Regulatory documentation supplied for KTR® SBS 201 indicates conformance to REACH Regulation (EC) No 1907/2006 as a registered substance, with no Substance of Very High Concern present above 0.1% w/w. RoHS compliance is declared against Directive 2011/65/EU Annex II restrictions for lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE at the maximum concentration values. The manufacturer’s production site operates under ISO 9001:2015 and ISO 14001:2015 management systems. Raw SBS thermoplastic elastomer is not a finished article; compliance of fabricated compounds depends on additives, colorants, and processing aids selected by the compounder, as well as total migration testing under the final food-contact regulation where applicable.
