Bada AG BADAFLEX® SEBS-Comp. TPE-S 80A 5015 EL is deployed in engine compartment pass-through points where wire harness bundles pierce the firewall, and is injection moulded into solid plugs, convoluted grommets and flat cable sealing collars. The material is selected because the saturated ethylene-butylene midblock resists ozone and UV attack better than unsaturated polydiene elastomers, which eliminates the need for antiozonant wax bloom that can compromise electrical contact surfaces. The compound is not suited to continuous hot mineral oil contact, and placement adjacent to constant oil drip sources should be avoided because SEBS swells in non-polar lubricants. Pre-drying is required only when residual moisture exceeds 0.05 %, measured by loss-on-drying at 105 °C or a Halogen moisture analyzer; typical drying conditions are 2–3 h at 70–80 °C in a desiccant dryer with dew point below −20 °C. The injection melt temperature is held between 190 °C and 230 °C at the nozzle, with maximum barrel residence time limited to 15 min because irreversible styrenic domain disruption begins above 240 °C. Mould surface temperature is controlled in the 25–45 °C range; the lower half of that range shortens cycle time but increases flow-line visibility on long vertical walls. Ejector pin push-through occurs on production lines when the part surface temperature at demoulding exceeds 60 °C, and sink marks appear at the thick collar section when holding pressure falls below 25 MPa. Tool design should specify non-return valves and direct sprue gating into the thick wall section rather than submarine gates at the thin lip. Dimensions on non-rigid parts are referenced to ISO 3302-1 class E2, and compression set is evaluated by ISO 815-1:2019 using 22 h at 70 °C and 25 % deflection; final acceptance values for dry harness applications should normally not exceed 60 %.

What Changes When Bada AG BADAFLEX® SEBS 80A Is Overmoulded Onto Glass-Filled Polypropylene?

Power tool impact guards and hand-grip inserts are produced in two-shot injection moulds where the first shot is PP-GF30 and the second shot is this TPE-S. The compound flows at lower melt viscosity than glass-filled polypropylene; barrel profiles therefore place the PP screw between 230 °C and 250 °C while the TPE-S barrel is set from 180 °C at the feed throat to 210 °C at the nozzle. Interfacial adhesion is not an automatic property; it depends on diffusion of the EB midblock segments into the softened polypropylene skin. When pre-moulded PP inserts cool below 90–110 °C before the SEBS shot enters, peel strength on the finished part can fall to levels that allow separation at the grip edge. Moulders maintain the moving half at 40–60 °C and keep transfer time below 5 s when using insert loading. A recurring field failure in insert moulding is steam blistering at the bond line when PP plaques are stored in uncontrolled humidity; both the substrate and the TPE-S must be pre-dried before processing. Mould shrinkage differentials control part flatness: unreinforced SEBS compounds of this hardness typically show linear mould shrink in the range 1.5–2.5 % according to ISO 2577, while PP-GF30 shrinks below 0.5 %. Long flat grips therefore require symmetric gate placement, balanced flow channels, and delayed ejection until the part surface falls below 50 °C. Peel resistance is evaluated by DIN 53531 at a 90° peel angle, and the failure mode should be recorded as adhesive at the interface or cohesive within the TPE; cohesive rupture demonstrates that the bond line is not the limiting zone. Published independent peel values for this exact 5015 EL grade are limited, so converters should generate substrate-specific data on their own tool geometry before fixing cycle time estimates. If the overmoulded article carries a conductive or flame-retardant claim, the final assembly must be tested separately because the raw SEBS compound alone does not transfer a UL 94 classification or RTI.

Detergent dispenser sleeves, drain bellows, and curved flexible connectors in vertical-axis washing machines are extruded from the compound as thin-wall convoluted profiles that must accept repeated flex cycles at 0.1–0.3 Hz during normal operation. The extrusion line uses a single-screw machine with L/D 24–30, a screw compression ratio of 2.5:1, and a barrier zone that limits melt temperature variation caused by high plasticizer content. Barrel temperatures are set from 160 °C at the feed section to 190 °C at the die head; above 200 °C, the melt tends to smoke and the profile surface becomes tacky. Vacuum calibration with water at 15–25 °C is used to fix thin-wall geometry, but rapid quenching can induce surface micro-cracks at the convolution roots when wall thickness drops below 0.8 mm. A draw-down ratio below 1.2:1 is maintained between die gap and calibration to reduce frozen-in stress. Under detergent exposure, the EB midblock provides resistance to alkaline water and soap solutions, but contact with chlorinated disinfectants should be limited because chlorinated species accelerate embrittlement of the styrenic phase. Rejection conditions on production lines commonly include radial thinning at the bellows root, pinholes caused by insufficient melt homogenization, and tacky surfaces from oil migration after long storage. Surface tack can be reduced by storing the compound below 25 °C and avoiding direct UV exposure. Hardness retention after 500 detergent cycles in consumer appliance validation is often checked by ISO 868 on the final profile; a shift upward of 5–8 Shore A may be acceptable if the sealing lip still recovers. Published data for this particular 5015 EL formulation in long-term hot detergent aging is limited, so appliance manufacturers should qualify the compound on their exact profile and wash program.

Flexible Tubing Connectors for Water-Handling Devices at Ambient Pressure

Water-conditioning units, aquarium circulation assemblies, and floor-cleaning machines use this 80 Shore A compound in flexible tubing connectors that are pushed over barbed fittings and retained without additional clamps below internal pressure of 0.3 MPa. The conversion route is profile extrusion through a straight die with an air mandrel; because the material has high melt strength, sagging is controlled by keeping the die temperature at 180–200 °C and the cooling bath air gap below 30 mm. A common failure on start-up is lumen collapse when the puller speed is too high relative to the cooling capacity; processors therefore hold the ratio of puller speed to extruder output such that the tube outer diameter falls within ±0.15 mm immediately after cooling. For water-contact service, the converter must independently verify migration and sensory properties according to Regulation (EU) 10/2011 Annex II and, where applicable, FDA 21 CFR 177.1810; the raw compound certificate does not transfer food-contact or drinking-water approval to the finished tubing. So-called boiling-water disinfection cycles above 80 °C will soften the part and may cause plasticizer extraction; SEBS-based TPE-S is therefore not recommended for hot-water pressure lines. Swelling in non-polar liquids also limits use to aqueous media; contact with aromatic hydrocarbon-based cleaning solvents leads to volume increase and loss of interference fit. If peristaltic pump elements are considered, the fatigue limit should be evaluated on the finished tube under the actual roller geometry because pinching produces localized heat and can raise the inner surface temperature above the ambient liquid temperature. Hardness before and after immersion in water at 60 °C for 7 days can be measured by ISO 868; migration of low-molecular-weight oil fractions produces surface tack and a small upward hardness drift, which may be acceptable only if fitting retention force remains above the assembly specification.

When Extruded EPDM Cellular Profiles Are Considered for Transit Window Encapsulation

Public transit window surrounds and interior glazing beads are candidates for the co-extrusion of a rigid polypropylene core and an outer sealing lip made from the 80 Shore A SEBS compound. The interest in replacement arises from the recyclability of the olefinic system, as well as lower compound density than vulcanized EPDM. Co-extrusion requires separate melt pumps and a feedblock die; the PP core is processed at 190–220 °C, while the TPE-S skin is maintained at 170–200 °C to limit degradation at the interface. Die swell of the SEBS component is greater than that of the rigid PP, so land length for the soft lip must be extended and the lip gap balanced by iterative trials. Downstream calibration uses low-friction vacuum blocks with water below 20 °C; rapid cooling increases lip stress but stabilizes profile geometry. For transit applications, the final profile assembly—not the raw TPE-S—must satisfy fire safety requirements such as EN 45545-2 R22 and R23; the plain SEBS compound cannot be assumed to meet higher hazard levels without flame-retardant testing. Ultraviolet stability is improved by the saturated EB midblock, but pigment and stabilizer loadings must still be qualified on the profile surface by accelerated weathering to ISO 4892-2. The material should not be used in areas continuously exposed to mineral oils, and it may become tacky if surface temperatures exceed 70 °C in direct sun. Manufacturers replacing EPDM should compare compression set after 70 h at 70 °C per ISO 815-1:2019, because SEBS compounds of this hardness typically have higher set than crosslinked EPDM but recover sufficiently for glazing bead retention in dry applications.

Compliance and test matrix referenced across the downstream scenarios

Application boundary	Standard or directive	Test parameter	Application-specific acceptance condition
Automotive firewall grommet	ISO 815-1:2019	Compression set, 22 h, 70 °C, 25 % deflection	Not exceeding 60 % for dry harness sealing; final article specification may be stricter
Overmoulded PP hand grip	DIN 53531	90° peel resistance after two-shot bonding	Record N/mm and failure mode; cohesive TPE failure required for bond-line approval
Washing machine bellows	ISO 868	Hardness shift after detergent exposure	Upward shift of 5–8 Shore A may be allowed if sealing recovery is retained
Water-contact tubing	Regulation (EU) 10/2011	Overall migration and sensory evaluation	Verified by converter for finished article; raw compound certificate does not transfer approval
Transit window profile	EN 45545-2	R22 and R23 fire spread and smoke	Final assembly classification required; material alone has no blanket rating
Furniture impact edge	REACH Regulation (EC) No 1907/2006	SVHC documentation	Batch-specific declaration required for institutional tenders

Contract furniture impact edges in educational and institutional environments are injection moulded as impact-absorbing feet, bumper strips, and cable exit caps that are press-fitted over powder-coated steel tube. The 80 Shore A hardness provides a soft interference fit on dry powder-coated steel, and the static coefficient of friction should be measured by ASTM D1894 because antiskid performance is influenced by surface texture, dust, and skin sebum. Pre-drying is required only if storage RH has exceeded 60 %; 2 h at 70 °C in a desiccant dryer removes surface condensate. The tooling must account for weld lines at the cable exit openings; because the SEBS melt solidifies rapidly, the mould should use hot-runner valve gates or widen the gap at the weld line to prevent stress cracking. Melt temperature at the nozzle is 190–220 °C, injection pressure is 40–70 MPa, and the tool surface is held at 30–50 °C. Demoulding is facilitated by a textured surface in the cavity rather than by external release agents, which can cause long-term adhesion loss when painted steel is contacted. For indoor furniture, volatile organic compound emissions may be governed by regional schemes, and batch-specific SVHC documentation is expected under REACH Regulation (EC) No 1907/2006; electrical components integrated into the furniture are also within the scope of Directive 2011/65/EU (RoHS). The part should be tested for wear resistance under dry conditions using ISO 4649, but because SEBS is a relatively soft material, high abrasive floor contact will produce visible loss; floor-contact feet should therefore be designed with a replaceable geometry. Published abrasion loss data for this precise 5015 EL grade is limited, so institutional buyers should require material-specific test plaques rather than relying on generic SEBS literature.