| HS Code | 384786 |
| Brand | Jusage |
| Grade | 1180 |
| Chemical Type | Styrene-Isoprene-Styrene (SIS) triblock copolymer |
| Appearance | White to off-white powder or pellet |
| Styrene Content | 18% |
| Isoprene Content | 82% |
| Diblock Content | 80% |
| Density | 0.92–0.95 g/cm3 |
| Melt Flow Rate | 10–20 g/10 min at 200°C/5 kg |
| Volatile Matter | ≤0.5% |
| Ash Content | ≤0.2% |
| Tensile Strength | ≥10 MPa |
| Elongation At Break | ≥700% |
| Shore A Hardness | 35–50 |
| Solution Viscosity | 800–1500 mPa·s at 25°C, 25% toluene |
| Molecular Weight | 100,000–200,000 g/mol |
| Glass Transition Temperature Polyisoprene Block | -60°C |
| Glass Transition Temperature Polystyrene Block | 100°C |
As an accredited Jusage Styrene-Isoprene-Styrene (SIS) Block Copolymer 1180 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Jusage SIS 1180 is typically supplied in 25 kg woven bags, 500 kg jumbo bags, or 1000 kg bulk bags. |
| Container Loading (20′ FCL) | Chemical Jusage SIS 1180 securely palletized and loaded into a sealed 20′ FCL container for safe ocean transport. |
| Shipping | Jusage SIS 1180, a styrene-isoprene-styrene block copolymer, is generally shipped as non-hazardous solid pellets or crumbs in 25 kg bags, bulk bags, or cartons. Transport in cool, dry, ventilated vehicles away from heat, moisture, and direct sunlight. No UN number or hazard class required. |
| Storage | Store Jusage SIS 1180 in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly closed and properly labeled. Protect from moisture, dust, and contamination. Store at moderate temperatures, preferably below 30°C. Separate from strong oxidizing agents. Follow local regulations, use secondary containment, and maintain good housekeeping. Avoid excessive stacking. Ensure adequate ventilation. No smoking. |
| Shelf Life | Jusage SIS 1180 has a shelf life of 2 years when stored in a cool, dry, well-ventilated place, away from direct sunlight. |
In hot-melt pressure-sensitive adhesive compounding, Jusage SIS 1180, a linear styrene-isoprene-styrene block copolymer with lot-certificate styrene content near 18 wt%, is typically charged at 25–35 wt% with a tackifier system of 50–60 wt% and a naphthenic or paraffinic process oil at 10–20 wt%. A hindered phenolic antioxidant is maintained at 0.5–1.0 phr to protect the unsaturated isoprene mid-block during extended thermal exposure. The styrene end-blocks require a high-softening-point resin fraction above 95 °C to preserve cohesive strength and static shear resistance in the finished tape. Batch compounding is run in a sigma-blade mixer with jacket temperature of 150–170 °C and rotor speed of 30–60 rpm under nitrogen blanket to limit oxidative chain scission. Continuous mixing uses a co-rotating twin-screw extruder with L/D ratio of 40:1 and a low-shear screw profile; high specific energy input above the line’s validated upper limit increases gel formation and viscosity drift in the isoprene phase. Coating through a slot die at 140–160 °C onto biaxially oriented polypropylene or polyester film at line speeds of 100–250 m/min produces label and carton sealing tapes. Finished adhesive films are tested under ASTM D3330/D3330M for 180° peel adhesion to stainless steel, ASTM D6195 for loop tack, and PSTC-107 for static shear at 1 kg load. For indirect food contact tape structures, FDA 21 CFR 175.125 applies, and migration testing is required under the specific food simulant selected for the end use. Without an effective stabilizer package, the isoprene block degrades rapidly above 190 °C, generating tack loss and visible yellowing within 4–6 h of continuous mixing.
Residual toluene values below 50 µg/g in coated medical tape are constrained by the drying capacity of the float-zone oven and the boiling-point gap between aromatic process solvents and the SIS 1180 mid-block. Jusage SIS 1180 is dissolved at 15–25 wt% solids in a mixture of toluene, hexane, and ethyl acetate to a Brookfield viscosity of 500–3,000 mPa·s at 25 °C. Tackifier addition at 80–120 phr of stabilized rosin ester lowers solution viscosity and improves wet-out on silicone release liners, but rosin ester loading above 140 phr shifts the glass transition temperature of the continuous phase above -10 °C and reduces low-temperature skin adhesion. Coating is performed with a comma coater or reverse-roll coater at wet film thickness of 30–80 µm, followed by a three-zone oven with zone temperatures of 60 °C, 80 °C, and 110 °C; residual solvent is measured by headspace gas chromatography according to ISO 11890-2. For wound dressing and surgical tape applications, cytotoxicity evaluation follows ISO 10993-5, and the raw polymer system is screened for absence of phthalate plasticizers and polycyclic aromatic hydrocarbons to satisfy REACH (EC) No 1907/2006, Annex XVII. Production-scale failures in this configuration occur when the web travels above 80 m/min without additional dryer modules, causing skin formation and entrapment of toluene inside the adhesive layer. Because SIS 1180 contains unsaturated isoprene units, long-term storage of compounded adhesive solution above 30 °C should be avoided unless the solvent blend contains a free-radical inhibitor.
Oxidized bitumen grades used in waterproofing membranes are modified with 3–7 wt% Jusage SIS 1180 in a vertical high-shear mixer at 180–190 °C. The styrene end-blocks do not dissolve rapidly below 150 °C; therefore, pre-dispersion of the pelletized grade in a shear mixer with a tip speed of 15–20 m/s is required before letdown into the bulk bitumen tank. After 60–90 min of mixing, the softening point measured by ASTM D36 typically moves from 85–95 °C to 110–125 °C depending on base bitumen composition. Elastic recovery measured by ASTM D6084 increases from below 30% to 55–75% when SIS content reaches 5 wt%. Penetration at 25 °C according to ASTM D5 falls to 20–30 dmm, indicating a stiffer matrix without brittleness at -10 °C. The finished modified bitumen is calendered into polyester-reinforced torch-on membrane sheets at 140–160 °C. Overheating the blend above 210 °C initiates isoprene block scission and raises the melt flow ratio beyond the membrane producer’s specification, producing voiding during torch application. Published data for specific oxidation states of paving-grade bitumen is limited; each base bitumen lot must be characterized for asphaltene content before adjusting the SIS dose.
Injection-molded footwear compounds that incorporate Jusage SIS 1180 at 10–20 wt% in a styrene-butadiene-styrene or SEBS matrix show Shore A hardness reductions of 8–15 points without measurable oil bloom after 7-day accelerated aging at 70 °C under ASTM D573. The grade is pre-blended with masterbatch pigment and a compatibilizing polystyrene resin at 160–180 °C in a co-rotating twin-screw extruder with an L/D ratio of 36:1. Injection molding is conducted with a screw back pressure of 5–8 MPa and a nozzle temperature of 180–190 °C; mold cooling is kept below 40 °C to prevent gloss variation. Finished sole plaques are evaluated for tensile strength and elongation at break under ISO 37, tear strength under ISO 34-1, and hardness under ASTM D2240. The use of higher SIS 1180 loadings above 25 wt% is limited by a sharp reduction in abrasion resistance as measured by ISO 4649; process operators observe sticky pellet bridging in the feed throat when hopper temperature exceeds 35 °C, requiring insulation or a chilled feed hopper on southern production lines. In toy and grip applications, compliance with EN 71-3 migration limits for heavy metals must be verified on the compounded pellet rather than on the raw block copolymer, because the oil and tackifier contribution can affect the final extractables profile.
Sprayable hot-melt adhesives for disposable hygiene elastic attachment use a formulation of 20–30 wt% Jusage SIS 1180, 45–55 wt% hydrogenated hydrocarbon tackifier, 15–25 wt% white oil, and 0.5–1.0 wt% antioxidant, with paraffin wax added only when open time must be shortened below 3 s. The adhesive is applied through heated spiral-spray nozzles at 150–160 °C and coat weights of 1–3 g/m² onto polypropylene nonwoven and polyethylene backsheet films. Melt viscosity measured at 160 °C with a Brookfield Thermosel according to ASTM D3236 is maintained between 3,000 mPa·s and 6,000 mPa·s to prevent misting and nozzle stringing. The elastic strands must be bonded within 0.5–1.5 s of adhesive application, before the SIS end-block network re-associates and reduces pressure-sensitive tack. Production lines using this grade report that high humidity above 70% RH in the coating room can deposit moisture on the nonwoven substrate, causing pinholes in the adhesive film and uneven creep performance. Creep resistance after 4 h at 38 °C under 0.5 kg load is measured by internal methods adapted from ASTM D3654/D3654M, and the adhesive must retain elastic strand fixation without slippage beyond 0.5 mm on standard polypropylene spunbond. For end products sold in European and US markets, the raw material and formulated adhesive are screened for REACH candidate list substances and for FDA 21 CFR 175.105 where indirect food contact is claimed.
| Application | Standard or regulatory reference | Limiting parameter or test condition |
|---|---|---|
| Hot-melt tape PSA | ASTM D3330/D3330M | 180° peel adhesion to stainless steel |
| Solvent-borne skin-contact adhesive | ISO 10993-5, ISO 11890-2 | Residual solvent below 50 µg/g; cytotoxicity grade per end use |
| Bituminous membrane compound | ASTM D36, ASTM D6084 | Softening point 110–125 °C; elastic recovery 55–75% |
| Footwear TPE compound | ISO 37, ISO 4649 | Hardness after aging 70 Shore A max; abrasion loss reported per lot |
| Nonwoven elastic attachment | ASTM D3654/D3654M, FDA 21 CFR 175.105 | Creep 0.5 mm at 38 °C/4 h |
Solution-cast self-seal envelope adhesives are prepared with Jusage SIS 1180 at 20 wt% solids in toluene and coated by gravure at 2–4 g/m² onto paper; residual toluene is controlled under plant-specific solvent recovery, and paper blocking is assessed by an internal spring-loaded plate method because no public standard is assigned to this low-coat-weight configuration.
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Jusage SIS 1180 is a linear styrene-isoprene-styrene block copolymer in which the terminal polystyrene blocks are separated by an unsaturated polyisoprene midblock. The grade designation carries a nominal styrene content of 18 mass %, with the balance consisting predominantly of isoprene; the terminal zero in SIS-series nomenclature is conventionally used to indicate a low diblock fraction, typically controlled below 1 mass % as determined by gel permeation chromatography calibrated under ISO 16014-2:2019 or an equivalent method. The material is supplied as porous pellets or crumb dusted with an inorganic partitioning agent to reduce cold flow and blocking during storage. Incoming quality control should verify melt mass-flow rate according to ISO 1133-1:2022 or ASTM D1238, tensile stress at break under ISO 37:2017, hardness under ISO 48-4:2018, volatile matter, ash content, solution viscosity, and total styrene content against the supplier certificate of analysis.
At ambient temperature the polystyrene end blocks form glassy domains that act as physical crosslinks, while the polyisoprene midblock contributes tack, low plateau modulus, and viscoelastic dissipation. The grade is intended for hot-melt pressure-sensitive adhesives, solvent-borne adhesive systems, radiation-curable adhesive films, and bituminous waterproofing compounds. In solvent processing the polymer may be dissolved in toluene, cyclohexane, or selected aliphatic-aromatic blends; the solubility window is narrow, and cloud point evaluation at 25 mass % solids should be performed before specifying a bulk solvent blend. Published data for this specific configuration is limited; formulators should not extrapolate solubility, melt viscosity, or adhesive peel values from other SIS grades without internal verification.
The practical melt window for Jusage SIS 1180 is bounded at the lower end by the softening of the polystyrene domains and at the upper end by thermal-oxidative degradation of the isoprene midblock. In a jacketed sigma-blade mixer, the material is typically compounded at 150 °C to 170 °C under a nitrogen blanket, with rotor speed held below 60 min⁻¹ to limit viscous heating. For twin-screw extrusion, an L/D ratio of 40:1 with a vented barrel is used; the melt temperature must remain below 190 °C to avoid gel speck formation from crosslinking of the unsaturated midblock. Above 200 °C the unsaturation undergoes hydrogen abstraction and allylic radical formation, producing a rise in melt viscosity followed by black speck contamination at the coating die.
Capillary rheometry under ISO 11443:2021 is recommended to map the melt viscosity-shear-rate response before setting gear pump pressure control. Because the melt is non-Newtonian, apparent viscosity measured at low shear in a rotational viscometer should not be used to predict throughput in a slot die. Oxidation induction time measured by differential scanning calorimetry under ISO 11357-6:2018 can be used as an incoming stabilizer check; the as-supplied antioxidant package is consumed rapidly if oxygen is not excluded from the feed throat. In production-scale mixers, a nitrogen flow sufficient to maintain oxygen below 1 vol% in the headspace reduces batch-to-batch variation in colour and peel strength.
Incompatibilities must be considered before compounding. Primary amine-based additives, strong acids, and unneutralized carboxylated tackifiers accelerate oxidative degradation of the isoprene midblock and should not be combined with the material without pre-screening. Similarly, metal stearates used as internal release agents can reduce oxidation induction time by promoting trace metal catalysis. Published data for this specific configuration is limited; therefore, antioxidant and UV-stabilizer packages should be validated on the final adhesive formulation rather than on the polymer alone.
In hot-melt pressure-sensitive adhesive compounding, the rubber-to-tackifier ratio rather than polymer molecular weight alone determines the balance between loop tack, peel adhesion, and shear holding power. For low-styrene SIS of this class, a starting formulation in the range of 30 parts polymer, 50 parts hydrogenated C5 tackifier, and 20 parts naphthenic oil by mass is often used when coating polyethylene foam tapes; however, no fixed formulation is supplied with the grade. The addition of oil lowers the glass transition temperature of the isoprene-rich phase and improves wet-out on low-surface-energy substrates, but at oil loadings above 30 phr the oil can migrate to the adhesive-substrate interface and cause adhesive delamination under ASTM D3330/D3330M peel testing. The material shows better melt compatibility with hydrogenated C5 resins than with fully aromatic C9 feedstocks; phase separation should be checked by hot-stage microscopy or melt cloud point before specifying a resin system.
Solvent-borne coating of SIS 1180-based adhesives is performed at solids contents between 25 mass % and 45 mass %, depending on the selected solvent blend. Reverse roll and comma bar coating are preferred over slot-die for low-viscosity solutions, and a four-zone oven profile with an initial zone temperature near 50 °C and final zone temperature of 90 °C reduces solvent blistering. Fast-evaporating aliphatic solvents can trap residual solvent in the isoprene phase, lowering room-temperature shear resistance; therefore the final dryer zone should be followed by a short equilibration roll at controlled moisture.
Release specifications for Jusage SIS 1180 should be confirmed against the certificate of analysis for the specific batch. The following test standards are applicable to this polymer class and its compounded adhesives.
| Test Parameter | Recognized Standard | Process or Release Function |
|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 / ASTM D1238 | Incoming polymer lot control and gear pump sizing |
| Tensile stress at break | ISO 37:2017 | Mechanical acceptance of compression-moulded sheets |
| Shore hardness | ISO 48-4:2018 / ASTM D2240 | Check of styrene domain reinforcement |
| Volatile matter | ISO 248-1:2021 | Drying requirement before melt processing |
| Ash content | ISO 247:2006 | Residual catalyst and partitioning agent control |
| Oxidation induction time | ISO 11357-6:2018 | Stabilizer effectiveness under thermal load |
| Solution viscosity | ISO 2555:2018 / Brookfield method | Control of colligative molecular weight in solvent systems |
| Adhesive peel strength | ASTM D3330/D3330M / PSTC-101 | Final tape or label performance ranking |
Regulatory status must be verified for the final article. The polymer is not supplied as a medical-grade or food-contact-certified material by default. If the compounded adhesive is intended for incidental food contact, compliance with FDA 21 CFR 175.125 must be established on the finished adhesive under the intended use conditions. Heavy metal restrictions under RoHS Directive 2011/65/EU and candidate-list substances under REACH should be confirmed with the supplier lot documentation because raw-material sourcing can affect trace cadmium, lead, and phthalate content.
Substitution of Jusage SIS 1180 for a hydrogenated SEPS or SEBS midblock should be evaluated against sterilisation, migration, and thermal-oxidative stability limits. The unsaturated isoprene midblock makes the grade susceptible to oxidative embrittlement during gamma irradiation and autoclave cycling. Where an assembly adhesive is exposed to 25 kGy to 40 kGy gamma dose, the material must be compounded with high-loading hindered phenolic antioxidants and possibly secondary thioester stabilizers; even then, published data for this specific configuration is limited. The grade is not supplied with a valid medical-grade statement. Biocompatibility must be established under ISO 10993-5 and ISO 10993-10 for the final adhesive system, not for the polymer alone.
Compared with hydrogenated SEPS, SIS 1180 exhibits higher room-temperature tack and lower plateau modulus but inferior thermal oxidative stability; the service ceiling in continuous dry heat should be set below 80 °C unless stabilizer validation demonstrates otherwise. Compared with SBS block copolymers, the isoprene-based midblock provides lower entanglement molecular weight, faster stress relaxation at ambient temperature, and softened cohesive response. This translates into lower peel force on polar substrates and improved low-temperature tack. However, the unsaturated midblock increases ozone sensitivity. Accelerated weathering under ASTM G154 may show surface cracking; the time to failure is formulation-dependent and must be measured on the compounded adhesive rather than inferred from the polymer alone.
Absorbed moisture on the pellet surface is the primary source of bubble defects in hot-melt coating of SIS 1180. Even when the moisture content is below the release limit of 0.5 mass %, water introduced into the melt at 160 °C flashes at the die lip and creates pinholes in the adhesive film. Production-scale desiccant dryers should maintain a dew point below −30 °C and an air inlet temperature not exceeding 50 °C to avoid premature surface crosslinking. The feed throat should be purged with dry nitrogen to prevent moist ambient air from condensing on chilled pellets.
In continuous coating, automatic gear pump pressure control is preferred over simple screw-speed control because melt viscosity variation of more than 10 % relative standard deviation can occur between batches. On a hot-melt line with a 1 200 mm slot die and line speed of 120 m/min, a melt temperature variation of ±3 °C can shift coat weight by more than 5 %; closed-loop temperature control is required to hold coating-weight tolerances on nonwoven and film substrates. Vacuum venting at −0.08 MPa gauge improves devolatilization, but the vent should be located downstream of the melting zone; otherwise low-molecular-weight tackifier fractions can be stripped from the melt. Incompatibilities with amine-based additives and strong acids remain the most common cause of downstream viscosity drift, gel formation, and colour instability in production-scale adhesive compounding.
