Kraton Kraton™G SEBS-Comp. G7820-1001-00
- Product Name: Kraton Kraton™G SEBS-Comp. G7820-1001-00
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Kraton Kraton™G SEBS-Comp. G7820-1001-00 is typically used in formulations when hardness, tensile properties, compression set, and melt-flow rate and processing, service-temperature, and environmental exposure limits must be controlled within specific ranges.
| HS Code | 537941 |
| Density | 0.90 g/cm³ |
| Hardness Shore A | 80 |
| Melt Flow Rate | 8 g/10 min (230 °C/2.16 kg) |
| Tensile Strength | 10 MPa |
| Elongation At Break | 600% |
| 100 Percent Modulus | 3.5 MPa |
| 300 Percent Modulus | 5.5 MPa |
| Tear Strength | 30 kN/m |
| Compression Set | 25% (70 °C/22 h) |
| Specific Gravity | 0.90 |
| Color | Natural |
| Form | Pellets |
As an accredited Kraton Kraton™G SEBS-Comp. G7820-1001-00 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Kraton™ G SEBS-Comp. G7820-1001-00 is packaged in sealed 25 kg moisture-barrier bags, palletized and labeled for industrial handling. |
| Container Loading (20′ FCL) | Full container load of Kraton™G SEBS-Comp. G7820-1001-00 chemical, loaded into a 20′ FCL container for export shipment. |
| Shipping | Kraton™ G SEBS-Comp. G7820-1001-00 is a non-hazardous thermoplastic elastomer compound in pellet form. It is not regulated for transport as dangerous goods and has no UN number or hazard class. Ship in dry, clean, closed containers, protected from moisture, heat, and contamination. |
| Storage | Store Kraton™ G SEBS-Comp. G7820-1001-00 in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, flames, and strong oxidizing agents. Keep containers tightly closed and properly labeled when not in use. Protect from moisture and physical damage. Follow local regulations and the manufacturer’s safety data sheet for segregation and shelf-life. |
| Shelf Life | Shelf life is typically 24 months from manufacture when stored unopened in original packaging in a cool, dry place. |
In cleanroom injection molding of elastomeric fluid-path components for Class II medical devices, Kraton™ G SEBS-Comp. G7820-1001-00 is processed with a reciprocating screw injection unit having an L/D ratio of 20:1 to 25:1 and a compression ratio of 2.5:1 to 3.0:1. Barrel temperature zones are profiled from 190 °C at the feed throat to 220 °C at the nozzle, and hot-runner systems are avoided where possible because residence time above 230 °C can shift apparent viscosity and increase gel formation in styrenic block copolymers. The material is injected into cold-runner molds with polished cavity surfaces; clamp force is calculated from projected part area at a melt pressure of 40–70 MPa. Pre-drying is not mandatory at ambient humidity below 60% RH, but pellets stored in opened supersacks are dried at 70 °C for 2 h if moisture uptake is suspected. Finished components such as intravenous port seals, syringe plunger tips, and peristaltic pump tube connectors are evaluated for cytotoxicity according to ISO 10993-5:2009, for irritation and sensitisation according to ISO 10993-10:2010, and for systemic toxicity under USP <88> Class VI; compliance with FDA 21 CFR 177.1810 may support incidental food-contact use in drug-delivery devices. The compound should not be blended with amine-containing processing aids because low-molecular-weight amines can migrate to the elastomer surface and interfere with ethylene oxide or gamma sterilisation at 25 kGy. Published data for this specific configuration is limited regarding post-sterilisation tensile retention, so lot-release testing is performed on ASTM D638-14 Type IV specimens at 500 mm/min.
What Determines Retort Gasket Compression Set After Cyclic Sterilisation?
For food-processing closures and steam-in-place dairy pipeline gaskets, G7820-1001-00 is formulated without free hydrocarbon plasticiser; addition of external mineral oil is limited to the supplier’s EU No 10/2011 food-contact statement and is normally below 5 wt% if dry-blended at all. The compound is injection-moulded into multi-cavity gasket tools with valve-gated cold runners; barrel temperatures are held at 190–220 °C, and the mould surface is cooled to 20–35 °C to prevent post-demoulding shrinkage. Gate freeze-off is monitored by cavity-pressure sensors, and pack pressure is maintained for 3–6 s after fill. Finished gaskets for retort, pasteurisation, and clean-in-place systems are tested under FDA 21 CFR 177.1810 extraction conditions, and overall migration is assessed under EU No 10/2011 in simulant A, B, D2, and E. Repeated autoclave cycles at 121 °C for 30 min shift compression set behaviour; property retention is measured per ASTM D395-21 after 22 h at 70 °C and after 70 h at 100 °C. The selection of peroxide-cured versus radiation-sterilised gaskets changes surface tack and closure torque; published data for this specific configuration is limited, so application validation includes cyclic compression-set testing on production seals. Wet steam above 135 °C should be avoided because thermal oxidation can embrittle edge sections. No amine-containing antistatic packages are used, and the pellets are not blended with ethylene vinyl acetate copolymers above 8 wt% without evaluating extractable fraction.
Flexible Cable Jacketing—Insulation Resistance and Compound Viscosity
Robot and medical cable jackets demand flexural fatigue resistance under tight bend radii, and the saturated ethylene-butylene midblock of G7820-1001-00 provides oxidation resistance without vulcanisation. Jacket extrusion runs on a single-screw extruder with an L/D ratio of 24:1 to 30:1 and a barrier screw; barrel temperatures are profiled from 180 °C at the feed zone to 210 °C at the die, and melt pressure is kept below 15 MPa to limit shear heating. The compound is run at a die gap of 0.5–1.2 mm and drawn down onto tinned-copper conductors with a wall thickness from 0.6 mm to 1.2 mm; melt fracture is controlled by adjusting screen-pack mesh from 60/80/100 layers. Insulation resistance is verified per IEC 60245-1 and flame spread per IEC 60332-1-2; surface resistivity is characterised per ASTM D257-14. The material is not crosslinked, so continuous conductor temperature is limited to 90 °C in dry conditions; published data for this specific configuration is limited regarding long-term aging at 105 °C, and accelerated aging per UL 1581 is performed on finished cords. When co-extruded with polypropylene-based fillers, layer adhesion is tested at 90-degree peel; no external release agents are used. The compound should not be dried above 80 °C because surface tack increases and pellets may bridge in the hopper.
| Application | Standard / regulation | Test method | Measured parameter |
|---|---|---|---|
| Medical fluid-path components | USP <88> Class VI, ISO 10993-5:2009, FDA 21 CFR 177.1810 | ISO 10993-10:2010, ASTM D638-14 | Cytotoxicity, tensile retention |
| Food-contact gaskets | EU No 10/2011, FDA 21 CFR 177.1810 | ASTM D395-21 | Overall migration, compression set |
| Flexible cable jackets | IEC 60245-1, UL 1581 | ASTM D257-14, IEC 60332-1-2 | Insulation resistance, flame spread |
| Automotive interior skins | VDA 278:2011, ISO 3795:1989 | ISO 188:2011 | VOC emissions, burn rate |
Overmoulded grips for powered hand tools and portable diagnostic devices are produced by injecting G7820-1001-00 onto rigid polycarbonate / ABS substrates in a two-shot rotary platen machine with clamp force from 1200 kN to 3500 kN. The rigid substrate is pre-dried at 80 °C for 4 h; the SEBS compound is processed at 200–230 °C and injected at 60–80 MPa through hot-runner valve gates. Because the compound is nonpolar, adhesion to polycarbonate and ABS is enhanced by mechanical interlocking features such as through-holes and undercuts, and by surface pre-treatment to the substrate supplier’s specified wetting threshold measured per ISO 8296. Cycle time is set by substrate cooling at 40–60 °C. The soft-touch layer is typically 1.5–3.0 mm thick; thinner sections below 1.0 mm may exhibit short shots at high L/D flow paths. Finished grips are tested for peel adhesion per ISO 813 and for Shore A hardness per ISO 868. Materials that contain free silicone oil should not be introduced into the same feed system because silicone oil migrates to the surface and reduces bond strength; isopropyl alcohol wipe cleaning is acceptable only after adhesion screening. Published data for this specific configuration is limited for two-shot bond strength on flame-retarded ABS grades, so validation must include solvent-wipe and 85 °C / 85% RH ageing.
When a Polypropylene Impact Modification Window Demands Rheological Matching
In compounding of polypropylene homopolymers and heterophasic copolymers, G7820-1001-00 is used as an impact modifier at addition levels of 5 wt% to 30 wt%. The polymer is dry-blended with polypropylene pellets and a co-rotating twin-screw extruder with an L/D ratio of 40:1 is operated at screw speeds of 400–800 rpm and barrel temperatures from 190 °C to 230 °C. The SEBS phase must be dispersed into elongated domains and then relaxed by downstream kneading blocks; interfacial tension between the SEBS and polypropylene is low enough to permit droplet break-up without excessive compatibiliser, but the addition of 2–5 wt% of a maleated polypropylene coupling agent is evaluated when the base resin contains high-crystallinity fractions or filler. Melt flow index is measured before and after extrusion according to ISO 1133-1:2022 at 230 °C / 2.16 kg; a drop of more than 35% in melt-flow index indicates excessive shear degradation and requires screw-speed reduction. Notched Izod impact strength is tested per ASTM D256-10 at 23 °C and −20 °C. The finished compounds are used in appliance housings, battery pack casings, and automotive interior brackets. Processing above 250 °C should be avoided because styrenic block copolymer degradation generates odour bodies; purge the extruder with low-melt-index polypropylene between colour changes. Published data for this specific configuration is limited for ethylene-octene polyolefin elastomer blends, so direct replacement studies require comparative brittle-ductile transition testing.
Low-Emission Soft-Skin Sheets for Automotive Interior Vacuum Forming
Extruded sheet made from G7820-1001-00 is used for vacuum-formed instrument panel skins and door-panel soft inserts where low volatile organic compound emissions and soft touch are specified. The sheet is produced on a single-screw extruder with a screw L/D ratio of 25:1 to 30:1 and a coat-hanger die; melt temperatures are maintained at 200–220 °C, and calendering rolls are set at 30–70 °C. Sheet thickness is controlled from 0.5 mm to 1.5 mm; draw ratio in vacuum forming is limited to 1:3 because higher ratios can fracture the elastomer at sharp radii. The formed skins are back-foamed or laminated to polypropylene substrates. Emission testing follows VDA 278:2011 for volatile and semi-volatile compounds; flammability is classified per ISO 3795:1989 with a burn rate below 100 mm/min. The compound should not be cleaned with aromatic solvents such as toluene or xylene, as aromatic penetration swells the styrenic domains and degrades dimensional stability. Long-term heat ageing at 100 °C is monitored per ISO 188:2011; published data for this specific configuration is limited for colour retention in beige and grey pigments, so exterior validation includes ΔE measurements per ISO 11664-4. If the sheet is reground, the regrind fraction is limited to 20 wt% to maintain grain retention and thermoforming consistency.
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- Kraton Kraton™G SEBS-Comp. G7820-1001-00 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.
Kraton Kraton™ G SEBS-Comp. G7820-1001-00 is a pelletized thermoplastic elastomer compound based on a styrene-ethylene/butylene-styrene triblock copolymer architecture. The “Comp.” suffix distinguishes this product from unextended neat SEBS polymers such as high-molecular-weight G1651 or G1654 grades. In compounded form, the elastomer is supplied with a pre-dispersed polyolefin and paraffinic or branched alkane modifier package intended to reduce the need for downstream extension-oil blending and to permit direct injection molding or profile extrusion on screw equipment that would be unable to handle the high melt viscosity of unmodified high-molecular-weight SEBS. Published grade-specific data for G7820-1001-00 remain limited; the representative processing boundaries and property ranges below are therefore derived from the broader G SEBS-Comp. platform and should be confirmed against the supplier lot certificate and current technical data sheet before production qualification.
Which melt-processing conditions preserve the polystyrene endblock network in G7820-1001-00?
Barrel temperature recommendations for SEBS compounds of this class typically range from 170 °C at the rear feed zone to 220 °C at the metering section, with melt temperature maintained below 240 °C. Sustained exposure above 250 °C is avoided because endblock phase separation weakens and the midblock can undergo thermo-oxidative chain scission, producing a measurable drop in tensile set resistance. For direct injection molding, hold pressures of 40–60 MPa, back pressures of 0.5–1.5 MPa, and mold temperatures of 20–40 °C are representative. Higher mold temperatures up to 60 °C improve weld-line strength but require cycle-time extension. On a 30:1 L/D co-rotating twin-screw extruder, screw speeds of 200–350 rpm and specific mechanical energy input between 0.15–0.22 kWh/kg are used to disperse the polyolefin modifier without excessive shear heating. Water-ring or under-water pelletizing systems are preferred when pellet surface temperature remains below 35 °C; die-plate drool is observed when melt temperature exceeds 235 °C during extended campaigns.
Pre-drying is not required under dry-air handling when storage relative humidity remains below 50% RH. If resin moisture exceeds 0.05 wt% as determined by Karl Fischer titration, drying at 70 °C for 2 h is typical. At relative humidity above 60% RH, open containers should not remain unsealed beyond 30 min because compounds of this hardness class show minor surface splay and gas marking when moisture is entrained into the shot. The moisture sensitivity is lower than that of thermoplastic polyurethanes, but the styrenic endblock network is not immune to surface defects during rapid decompression molding.
Capillary rheometry on SEBS compounds of this hardness class indicates pseudoplastic shear thinning with typical apparent viscosity at 100 s⁻¹ and 230 °C in the range of 100–300 Pa·s. Because the product is pre-compounded, the shear history already imparted during twin-screw compounding reduces the high-molecular-weight tail that dominates neat SEBS batch viscosity. This shifts the onset of melt fracture to higher shear rates but does not eliminate the possibility of sharkskin at injection velocities above 150 mm/s. Mold filling should be pressure-limited rather than velocity-limited when thin-wall sections fall below 0.8 mm.
Single-screw extrusion of profiles and tubing from this compound requires a three-zone screw with a compression ratio between 2.5:1 and 3.5:1 and a length-to-diameter ratio of 24:1 to 30:1. Feed-throat temperature should be maintained at 25–40 °C to prevent pellet blocking. Melt temperature should be measured at the adapter with an immersion depth of at least 10 mm; temperature differences greater than 5 °C across the melt stream indicate non-uniform plastication and should be corrected before sizing. Profile extrusion die swell is typically 10–20%; the draw ratio after the die should be limited to 1.0–1.2 to preserve skin/core morphology.
Mechanical response after compression set and oil retention testing
The following values are representative of medium-hardness SEBS compounds in the G7820 series and are not certificate-of-analysis limits. Lot-specific values will vary with paraffinic oil content, polyolefin type, and pelletizing conditions.
| Property | Test method | Representative range |
|---|---|---|
| Hardness | ASTM D2240-15e1 | Shore A 45–60 |
| Specific gravity | ASTM D792-20 | 0.90–0.95 |
| Tensile strength at break | ASTM D412-16, Die C | 6–10 MPa |
| Elongation at break | ASTM D412-16, Die C | 500–700% |
| Compression set, 23 °C/22 h | ASTM D395-18, Method B | 15–25% |
| Compression set, 70 °C/22 h | ASTM D395-18, Method B | 35–50% |
| Melt flow rate, 230 °C/2.16 kg | ISO 1133-1:2022 | 3–12 g/10 min |
Compression set values at 70 °C are strongly influenced by the polyolefin crystalline fraction. A compound with higher propylene content exhibits lower set after aging but higher Shore A hardness and reduced low-temperature flexibility. The pre-compounded product therefore locks a specific hardness-compression set balance; this is the primary distinction from in-house blends of neat SEBS and polypropylene, where the compounding technician can shift the ratio line-side.
The principal differences between G7820-1001-00 and unextended high-molecular-weight SEBS are summarized below; values are representative across the G SEBS-Comp. platform and do not replace lot-specific data.
| Parameter | G7820-1001-00 | Neat high-molecular-weight SEBS |
|---|---|---|
| Form | Pelletized TPE compound | Pelletized polymer |
| Required downstream extension-oil blending | None or minimal | 50–70 phr oil typical with 20–40 phr polypropylene |
| Melt viscosity at 230 °C | Lower, suited to standard injection molding | Higher, requires high-torque compounding |
| Line-side hardness adjustment | Limited; fixed in compound | Broad, by adjusting oil and polypropylene loading |
| Typical processing route | Direct injection molding or profile extrusion | Twin-screw compounding into finished TPE |
| Property consistency | Controlled by supplier compounding | Dependent on in-house blending accuracy |
Because G7820-1001-00 is a pre-compounded product, the production technician cannot make viscosity corrections by adding oil at the press. This fixed-compound constraint reduces batch-to-batch drift but removes a processing freedom commonly used with neat SEBS bases. If a hardness outside the supplied range is required, a different compound grade or an in-house blend based on neat SEBS should be considered rather than attempting to modify G7820-1001-00 by dry blending.
If the part is overmolded onto polypropylene or exposed to quaternary ammonium disinfectants
Overmolding onto polypropylene requires the SEBS compound melt temperature to remain between 190 °C and 210 °C at the nozzle, while the polypropylene substrate is maintained at 200–230 °C. Interfacial peel resistance should be evaluated on finished plaques using a 90° peel angle and crosshead speed of 100 mm/min, following a protocol derived from ASTM D6862-11; published data for this specific configuration are limited, so production acceptance must be established on customer tooling. The styrenic endblock network is chemically compatible with nonpolar polyolefins, but surface transfer of mold-release agents must be minimized because even thin contamination layers can reduce adhesion.
Chemical compatibility with 70% isopropanol and 0.5% quaternary ammonium disinfectants is generally acceptable for short-term wipes. Long-term immersion should be assessed by ISO 175:2010 for 7 days at 23 °C, with dimensional change recorded at 1 day, 3 days, and 7 days. A weight increase above 10% or Shore A loss above 5 units indicates excessive plasticizer extraction and should disqualify the material for repeated clinical surface disinfection. Contact with high-aromatic hydrocarbons and ketonic solvents is not recommended because endblock solvation leads to rapid softening.
Storage should be in sealed original containers at 5–35 °C and below 50% RH. Avoid contact with copper-based alloys at melt temperatures above 200 °C because copper ions accelerate thermo-oxidative degradation of the midblock. The compound is incompatible with strong oxidizing acids and aromatic solvents; incidental contact should be evaluated under ISO 175:2010. Regrind addition above 20 wt% is not permitted without validation of melt flow rate, tensile elongation, and surface gloss because repeated heat histories increase the crystalline fraction of the polyolefin modifier and reduce low-temperature impact.
Regulatory screening, extractables constraints, and migration testing
Food-contact suitability of the base styrenic block copolymer is generally assessed under 21 CFR 177.1810, but the pre-compounded polyolefin and paraffinic oil package may require additional clearances under 21 CFR 178.3290 or 21 CFR 178.3620. A supplier food-contact statement is required because lot-specific antioxidant packages can influence extractables. For medical applications, cytotoxicity screening is performed according to ISO 10993-5:2009 and irritation screening according to ISO 10993-10:2010; the resin is not supplied sterile and is not qualified as an implantable material. REACH and RoHS declarations must be obtained lot-by-lot, as flame-retardant or stabilizer additives can vary with production campaign.
Applications for this class include soft-touch grips, overmolded seals, consumer electronic bumpers, medical device housings, and appliance gaskets. Each application requires validation of compression set under the actual service temperature. For automotive interior components, volatile organic compound emissions should be tested by VDA 278 after conditioning at 90 °C for 30 min, and fogging by DIN 75201; published data for this specific configuration are limited, so component-level testing is required. Flammability classification is application-specific; if required, testing on 3.0 mm plaques according to UL 94 is to be performed. No classification is assigned in this document.
