Bada AG BADAFLEX® SEBS-Comp. TPE-S 80A 1032
- Product Name: Bada AG BADAFLEX® SEBS-Comp. TPE-S 80A 1032
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Bada AG BADAFLEX® SEBS-Comp. TPE-S 80A 1032 is typically used in formulations when Shore A 80 hardness/elastic recovery/overmold adhesion and service temperature/chemical/UV exposure must be controlled within specific ranges.
| HS Code | 549442 |
| Processing Methods | injection molding/extrusion |
| Service Temperature Range C | -50 to 100 |
| Color | natural/translucent |
As an accredited Bada AG BADAFLEX® SEBS-Comp. TPE-S 80A 1032 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | BADAFLEX® SEBS-Comp. TPE-S 80A 1032 is packaged in 25 kg moisture-resistant bags on pallets, clearly labeled and sealed for dry storage. |
| Container Loading (20′ FCL) | 20′ FCL loaded with palletized 25 kg bags of BADAFLEX® SEBS-Comp. TPE-S 80A 1032; keep dry, ambient, moisture-protected. |
| Shipping | Non-hazardous thermoplastic elastomer pellets, BADAFLEX® SEBS-Comp. TPE-S 80A 1032; no UN number, hazard class, or packing group assigned. Pack in moisture-proof bags or octabins. Store dry at moderate temperature, protected from UV and contamination. Follow SDS and local transport regulations. |
| Storage | Store `Bada AG BADAFLEX® SEBS-Comp. TPE-S 80A 1032` in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and oxidizing materials. Keep in original, tightly closed packaging to prevent moisture and contamination. Protect from UV and dust, avoid prolonged storage above recommended temperatures, maintain stable pallets, and follow local regulations and the supplier safety data sheet. |
| Shelf Life | Shelf life is typically 24 months from manufacture when stored in original sealed packaging under cool, dry conditions, away from sunlight. |
For automotive interior soft-touch elements such as door pull cups, seat-belt sleeve covers, and cupholder liners, BADAFLEX® SEBS-Comp. TPE-S 80A 1032 is processed by injection molding at melt temperatures of 200 °C to 230 °C measured at the nozzle with an immersion thermocouple; the barrel profile is set to 180 °C in the feed zone, 210 °C in the compression zone, and 220 °C at the metering section, while the mold is held at 25 °C to 40 °C with water circulation. At mold temperatures below 25 °C, flow-front hesitation on thin rib sections ≤0.8 mm produces visible weld lines; above 40 °C cycle time increases but tear strength measured by ISO 34-1 Method B improves by 5–10 %. Multi-component tools overmold the TPE onto polypropylene substrates preheated to 80 °C surface temperature; adhesion in a 90-degree peel test exceeds 6 N/mm only when substrate surface energy is at least 38 mN/m as determined by DIN 55660-2 test inks. On a 280 t hydraulic injection molding machine with a 45 mm screw and L/D 20:1, cushion is maintained at 2–4 mm; if cushion falls below 2 mm, shot-to-shot hardness variation exceeds ±2 Shore A points under ISO 7619-1. Dry blending with 2–5 wt% EPDM-based color masterbatch is acceptable; above 5 wt%, Shore A hardness increases by 2–3 points under ISO 7619-1, and compression set after 22 h at 70 °C per ISO 815-1 Method A may exceed 35 %. External lubricants above 0.2 wt% are avoided because plate-out develops on vented zones of 40 mm screw diameters after approximately 200 cycles. Compliance for this segment references VDA 278 for VOC and fogging, with production validation targets of total VOC below 100 µg/g and fogging condensate below 250 µg/g after 2 h at 90 °C, and FMVSS 302 with burn rate below 100 mm/min for interior materials. End products include seat-belt guides, cupholder liners, load-floor edge trim, and door pull cups.
Why Does Co-Molding with PC/ABS Demand Higher Thermal Input Than Standard SEBS Grades?
Co-molding of BADAFLEX® SEBS-Comp. TPE-S 80A 1032 onto polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) substrates in handheld electronics housings requires nozzle set points 10–20 °C higher than mono-material SEBS molding because the TPE melt must soften the substrate surface layer to a depth of 0.05–0.10 mm for mechanical interlocking. On a 120 t hydraulic injection molding machine with a 30 mm three-zone screw at L/D 20:1, the barrel profile is 200 °C in the feed zone, 225 °C in the compression zone, and 235 °C at the nozzle; the hot runner manifold is set to 220 °C and the valve gate tip to 235 °C. First-stage injection speed is limited to 60–80 mm/s to prevent jetting at gate diameters between 0.8 mm and 1.2 mm; holding pressure is maintained at 30–45 MPa for a gate seal time of 4–6 s. Bond strength is evaluated by DIN EN 1464 floating roller peel on a 25 mm-wide specimen; acceptable separation force after 24 h conditioning at 23 °C and 50 % relative humidity exceeds 3 N/mm. Compliance for consumer electronics includes IEC 62321-8 for restricted phthalates, each phthalate ≤0.1 % by mass, and RoHS Directive 2011/65/EU Annex II for lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers. In button arrays with a 10:1 substrate-to-TPE mass ratio, TPE layer thickness below 0.8 mm requires vent groove depths of 0.01–0.02 mm to avoid burn marks; if the layer exceeds 3 mm, sink marks at rib intersections are controlled by holding pressure rather than by mold temperature. End products include headphone yoke bumpers, earbud stems, and remote-control side grips.
White Goods Seal Retention and Compression Set After 1,000 h at 70 °C
In front-loading washing machines and dishwashers, door seals and anti-vibration pads made from BADAFLEX® SEBS-Comp. TPE-S 80A 1032 are evaluated for long-term recovery under continuous clamp compression. For long-term validation, specimens are preconditioned for 1,000 h at 70 °C before testing per ISO 815-1:2019 Method A; compression set above 55 % is rejected, while routine lot release uses 24 h at 70 °C with a reject limit of 35 %. The compound is processed on a 300 t toggle clamp injection molding machine with a 50 mm screw and 22 mm check ring; injection pressure of 80–100 MPa is required to fill seal lips with wall thickness of 1.5–3.0 mm, while screw back pressure is held at 5–8 MPa to disperse color masterbatch without shearing heat-sensitive additives. Mold temperature is maintained at 30–50 °C; below 25 °C surface delamination at the flow front appears as spiral streaks within the first 10 mm of the part, and above 50 °C cycle time increases without measurable improvement in compression set. The production floor blend is 97 wt% BADAFLEX® 80A 1032 and 3 wt% addition-cured silicone masterbatch to reduce surface friction; condensation-cured silicone masterbatch must not be used because volatile by-products generate gas bubbles in the plasticating unit. Compliance references DIN EN 60456 for washing machine energy consumption, with seal friction limited so motor current increases no more than 0.05 A under loaded drum conditions; extraction tests for potable water contact are conducted with simulant A (10 % ethanol) under Regulation (EU) No 10/2011 when the seal directly contacts drinking water. End products include dispenser drawer seals, door gaskets, and pump vibration mounts.
| Segment | Melt temperature | Mold/line temperature | Injection or screw speed | Pressure/back pressure | Observed process failure |
|---|---|---|---|---|---|
| Automotive interior | 200–230 °C | 25–40 °C | 60–100 mm/s first stage | 30–45 MPa holding | Weld lines in sections ≤0.8 mm |
| Electronics overmold | 220–235 °C | 25–40 °C mold | 60–80 mm/s first stage | 30–45 MPa holding; gate seal 4–6 s | Jetting at gates 0.8–1.2 mm |
| White goods seals | 200–220 °C | 30–50 °C | 80–100 mm/s | 80–100 MPa injection; 5–8 MPa back pressure | Spiral streaks in first 10 mm at mold below 25 °C |
| Medical device housings | 200–230 °C | 30–50 °C mold | 40–70 mm/s | 40–60 MPa injection | Splay above 0.05 % moisture |
| Construction extrusion | 200–215 °C die entry | 15–20 °C cooling water | 30–60 rpm screw speed | Die pressure fluctuation ≤±0.5 MPa | Melt fracture at land >12 mm below 30 rpm |
| Sporting goods co-mold | 220–240 °C | 100–120 °C substrate surface | 30–50 mm/s | 30–45 MPa holding | Glass fiber washout at interface |
For non-invasive device housings such as handheld diagnostic monitor bumpers and ultrasound transducer cable strain reliefs, BADAFLEX® SEBS-Comp. TPE-S 80A 1032 is processed in an ISO 14644-1 Class 8 cleanroom environment using an all-electric 160 t injection molding machine with a 28 mm wear-resistant screw. Injection speed is maintained at 40–70 mm/s, and injection pressure at 40–60 MPa to avoid burn marks in thin strain relief sections below 0.8 mm. The material is pre-dried at 70 °C for 2 h when ambient relative humidity exceeds 60 %; moisture above 0.05 % by weight produces surface splay and increases Shore A variation by ±3 points under ISO 7619-1. This grade is not supplied as a medical-grade resin, so end-article qualification under ISO 10993-5 for cytotoxicity and ISO 10993-10 for skin sensitization is mandatory for body-contact applications; each lot must be traceable to compounding batch records and process parameters logged within ±2 °C barrel deviation. In overmolding onto medical-grade polycarbonate handles, adhesion is validated after 50 autoclave cycles at 121 °C for 30 min; tensile strength at break is measured on ISO 527-2 Type 5A specimens and must retain at least 85 % of the pre-autoclaved value. Published peel strength data for this specific TPE over medical-grade polycarbonate under repeated autoclaving are limited; final tool validation is required for every new part geometry. The dry colorant ratio is limited to 2 wt% of an organically colored EPDM masterbatch to reduce heavy metal leachables; simulated sweat extraction per DIN EN ISO 12870 is used to verify total heavy metal release below 0.01 µg/g. End products include stethoscope tubing connectors, monitor edge bumpers, and non-load-bearing instrument grips.
When Weather-Sealing Profiles Are Extruded Below 30 rpm, Melt Fracture Appears at Die Land Lengths Above 12 mm
Construction glazing gaskets, expansion joint profiles, and sunshade edge strips using BADAFLEX® SEBS-Comp. TPE-S 80A 1032 are produced on single-screw extruders with screw diameters of 45–60 mm and L/D ratios of 24–30:1. Screw speed below 30 rpm at die land length above 12 mm produces melt fracture because residence time distribution broadens and SEBS hard-block domains undergo insufficient shear; die entry pressure fluctuation should not exceed ±0.5 MPa for profile tolerances of ±0.1 mm on a 5 mm cross-section. Barrel temperature profile from feed to die is 170 °C, 190 °C, 205 °C, and 210 °C, with adaptor and die at 205 °C; melt temperature at die entry is measured at 200–215 °C with an infrared pyrometer. Cooling water temperature is controlled to 15–20 °C, and a vacuum sizer with negative pressure of 0.2–0.4 bar holds the profile shape. The compound is extruded either as supplied or with 5 wt% of a UV-stabilized SEBS masterbatch containing hindered amine light stabilizers and benzotriazole UV absorbers; after 3,000 h of xenon-arc weathering under ISO 4892-2 Method A, changes in Shore A hardness must remain below 5 points and tensile strength retention above 80 % when tested per ISO 37. Compliance for construction profiles follows DIN EN 12365-1 for gasket thermal movement and DIN 18542 for joint sealing; vertical flame spread performance is assessed under EN 13501-1 when required. End products include façade gaskets, door bottom seals, and expansion joint filler strips.
| Segment | Primary standard | Measured condition or limit |
|---|---|---|
| Automotive interior | VDA 278; FMVSS 302 | VOC <100 µg/g; fogging <250 µg/g; burn rate <100 mm/min |
| Consumer electronics overmold | IEC 62321-8; RoHS Directive 2011/65/EU Annex II | Each restricted phthalate ≤0.1 %; lead etc. at directive limits |
| White goods seals | ISO 815-1:2019; Regulation (EU) No 10/2011 | Compression set ≤35 % (24 h, 70 °C); simulant A overall migration per directive |
| Medical device housings | ISO 10993-5; ISO 10993-10; ISO 527-2 | Tensile strength retention ≥85 % after 50 autoclave cycles at 121 °C |
| Construction profiles | ISO 4892-2; DIN EN 12365-1 | Shore A change <5 points; tensile retention >80 % after 3,000 h xenon-arc |
| Sporting goods co-mold | DIN EN 1464; ISO 4210-5 | Peel adhesion >4 N/mm on 20 mm coupon |
Sporting Goods Overmold Adhesion on Glass-Filled Nylon Substrates
For grip-intensive applications in cycling and hand tools, hand tool grips, bicycle handlebar end caps, and ski pole grips made from BADAFLEX® SEBS-Comp. TPE-S 80A 1032 are co-molded over glass-fiber-reinforced polyamide 6 or polyamide 6.6 substrates. To achieve peel adhesion above 4 N/mm on a 20 mm coupon under DIN EN 1464, substrate moisture must be below 0.1 % by weight; a substrate surface temperature of 100–120 °C is generated during the injection cycle by delaying TPE injection 2–4 s after substrate solidification. On a 180 t injection molding machine with a 35 mm screw and L/D 22:1, melt temperature is maintained at 220–240 °C, and injection speed at 30–50 mm/s to prevent glass fiber washout at the interface. The TPE layer thickness is designed at 2–3 mm for grip compliance; below 1.5 mm, Shore A 80 hardness limits energy absorption and reduces impact damping under ISO 4210-5 for bicycle components. Additives include 4 wt% adhesion-modified SEBS-g-MA masterbatch; this grafted maleic anhydride functionality must be purged with polypropylene after runs because residual maleic anhydride causes screw corrosion on non-nitrided 35 mm screws over 50 production hours. End products include vibration-damped grips, handlebar end caps, and protective bumper edges.
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- Bada AG BADAFLEX® SEBS-Comp. TPE-S 80A 1032 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.
Bada AG BADAFLEX® SEBS-Comp. TPE-S 80A 1032 is a styrenic block copolymer thermoplastic elastomer classified as TPE-S under ISO 18064:2022. The polymer network is built around a saturated poly(ethylene/butylene) midblock, with phase-separated polystyrene end blocks that function as physical crosslinks. The nominal hardness of 80 Shore A is determined by indentation hardness methods according to ISO 48-4:2018 or ASTM D2240. The compound is supplied as pellets for injection molding and extrusion, and is available in natural, pre-colored, or black variants depending on batch specification. The suffix 1032 denotes a specific stabilizer, oil, and flow-modification package within the BADAFLEX TPE-S 80A series. Grade-specific published data for this exact suffix is limited; the values discussed in the following sections are class-typical for SEBS-based compounds in the 78–82 Shore A band and should be verified against the current Bada AG technical datasheet and certificate of analysis.
Compositionally, the material may include a polyolefin compatibilizer phase, a paraffinic or naphthenic process oil, and a mineral filler or carbon black package. Because SEBS compounds are formulated without orthophthalate plasticizers, they avoid the plasticizer-migration and low-temperature stiffening issues associated with flexible PVC. The saturated midblock contributes better thermo-oxidative stability and ozone resistance than SBS-based TPS materials at equivalent hardness. Density class-typically falls between 0.90 and 0.92 g/cm³ under ISO 1183-1:2019, which is lower than flexible PVC and TPU alternatives of similar indentation hardness.
Physical Property Boundaries Measured Under ISO 37 and ISO 1183-1
Mechanical characterization on injection-molded plaques or die-cut tensile specimens after conditioning at 23±2 °C and 50±5 % relative humidity produces the class-typical property ranges listed below. These values are not batch release limits unless specifically stated on the Bada AG certificate of analysis.
| Property | Test method | Class-typical range | Unit |
| Hardness | ISO 48-4:2018 | 78–82 | Shore A |
| Density | ISO 1183-1:2019 | 0.90–0.92 | g/cm³ |
| Tensile strength | ISO 37:2017 | 7–12 | MPa |
| Elongation at break | ISO 37:2017 | 500–700 | % |
| Tear strength | ISO 34-1:2015 | 25–35 | kN/m |
| Compression set, 72 h/23 °C | ISO 815-1:2017 | 20–30 | % |
| Compression set, 72 h/70 °C | ISO 815-1:2017 | 45–60 | % |
The tensile values obtained under ISO 37:2017 are influenced by specimen geometry; type 5A dumbbells usually provide lower scatter than type 5 for this hardness class. Tear strength measured by ISO 34-1:2015 is method-dependent; the range above should be treated accordingly. The density value applies to unfilled natural material; black or mineral-filled versions can reach 0.94–0.98 g/cm³.
Low-temperature flexibility is retained because the EB midblock glass transition is below -60 °C. At ambient and slightly elevated operating temperatures, the material behaves as an elastomeric network, but the temperature window is bounded by polystyrene domain softening above 90–100 °C. This thermal boundary directly influences compression-set and recovery behavior.
Production-scale injection molding of the BADAFLEX TPE-S 80A 1032 grade on machines with clamp force from 600 to 1,200 kN requires a melt temperature of 180–220 °C, with the nozzle not exceeding 230 °C. Barrel profiles typically increase from 160 °C in the feed zone to 200–220 °C in the metering section. Back pressure between 5 and 15 bar, screw surface speed between 50 and 120 rpm, and shot volume at 30–70 % of barrel capacity limit shear heating and residence time. Operating above 240 °C or holding material at melt temperature for longer than 10 minutes can degrade the polystyrene domains, causing reduced tear strength and yellowing. If the melt is exposed to high shear rates above 5,000 s⁻¹, gate blush and surface melt fracture may appear; enlarging gates and reducing injection velocity corrects those defects.
Drying is not usually needed for sealed fresh material, but if sacks have been opened for more than 4 hours at relative humidity above 60 %, a desiccant dryer at 70–80 °C for 2–4 hours is recommended. Drying air dew point should be below -30 °C. Temperatures above 85 °C should be avoided because pellet surface tack can develop and cause hopper bridging. Mold shrinkage under ISO 294-4:2018 class-typically ranges from 1.2 to 1.8 % in the flow direction and 1.0 to 1.6 % transverse, with wall thickness and gate design as primary variables.
For extrusion of profiles, tubing, or sheet, a single-screw extruder with L/D 24:1 or a co-rotating twin-screw extruder with L/D 40:1 is operated with a barrel profile from 165 to 210 °C. Melt pump inlet pressure should be kept below 120 bar. For compounding or reprocessing, specific energy input class-typically lies between 0.18 and 0.25 kWh/kg. Clean sprues, runners, and edge trim can be reintroduced at 20–30 % by mass, but thermally degraded scrap should be segregated because it increases compression set and surface pitting.
In overmolding onto polypropylene, substrate surface temperatures between 60 and 100 °C and rapid injection improve interfacial wetting. Vent depths of 0.015–0.030 mm are used to prevent burn marks at flow-line ends. Mold surface temperatures from 20 to 50 °C are normally sufficient, but textured grips require the upper end of the cooling-control range to reproduce fine grain.
How Does the SEBS Hard Block Network Influence Compression Set at 70 °C?
Compression-set behavior in the BADAFLEX TPE-S 80A 1032 class is governed by the physical crosslinks formed by phase-separated polystyrene end blocks. Below the polystyrene glass transition, typically 90–100 °C, the network resists permanent deformation. Under ISO 815-1:2017 with 25 % strain for 72 hours, class-typical compression set is 20–30 % at 23 °C and 45–60 % at 70 °C. The higher set at 70 °C reflects partial relaxation of the styrenic domains and redistribution of the oil phase.
For dynamic sealing applications, retained contact force decays over the first 24 hours under compression. This is relevant in grommets, bushings, and static gaskets, where initial assembly force is higher than the long-term sealing force. Grade-specific retention-ratio data for the 1032 suffix is not published; validation should be performed on actual profile geometry at the upper service temperature.
At temperatures above 90 °C, compression set can exceed 60 % and recovery force may fall below the minimum required for low-pressure sealing. In those situations, a peroxide-cured TPV with EPDM crosslinks generally offers lower compression set at 100 °C and better hot-oil resistance, but at the expense of higher density and less overmolding compatibility with polyolefins. Below -40 °C, the EB midblock maintains flexibility, though the oil package can increase stiffness if a high-viscosity paraffinic oil is used.
RoHS conformity for the BADAFLEX TPE-S 80A 1032 grade is assessed against 2011/65/EU Annex II restrictions for lead, cadmium, mercury, hexavalent chromium, PBB, and PBDE. The threshold is 0.1 % by mass in homogeneous material, except cadmium at 0.01 % by mass. REACH SVHC screening follows Regulation (EC) No 1907/2006 as amended. Food-contact and drinking-water suitability under Regulation (EU) No 10/2011 or FDA 21 CFR 177.2600 is not automatic for every lot; the current Bada AG grade certificate must confirm the exact suffix and color.
The fully saturated EB midblock provides improved ultraviolet and ozone resistance compared with SBS-based TPS. However, unpigmented natural grades are not inherently UV-stable for long-term outdoor exposure. Carbon black at 2 % by mass or a hindered amine light stabilizer package is generally required for tropical exposure; xenon arc testing under ISO 4892-2:2013 is used to qualify color and surface retention. In contact with mineral oils, class-typical volume swell after 7 days at 23 °C by ISO 1817:2015 may exceed 30 %, limiting continuous immersion applications. Dilute aqueous acids and bases are generally tolerated, but published data for the exact 1032 configuration is limited.
Interior emission behavior is grade-dependent and driven by oil volatility. Class-typical total VOC emissions by VDA 277:2018 can range from 100 to 500 µg C/g; fogging by ISO 6452:2021 must be verified for each color. For low-odor consumer articles, a low-volatility oil package or post-molding aeration may be specified. Storage stability is maintained in sealed packs at 5–40 °C away from direct sunlight. Under those conditions, shelf life is typically 24 months. Hot-air drying beyond 85 °C increases surface tack and additive migration; those effects are not reversed by re-drying.
When a Shore 80A SEBS Compound Replaces Vulcanized EPDM in Low-Pressure Sealing
This material can replace vulcanized EPDM in static gaskets, edge protectors, suction cups, and overmolded grips when the thermal and chemical demands are moderate. A standard reciprocating-screw injection molding machine with 3-zone screw and clamp force of 600–800 kN can produce finished parts without vulcanization, enabling shorter cycles than compression-molded EPDM for thin-wall and overmold geometries. Actual cycle time depends on part mass, wall thickness, and cooling-channel design.
Compared with vulcanized EPDM of similar hardness, the BADAFLEX TPE-S 80A 1032 class has lower density, avoids the mixing and scrap losses associated with sulfur or peroxide cure systems, and can be re-melted. Its compression set at 70 °C is higher than sulfur- or peroxide-cured EPDM; therefore, replacement is appropriate for static seals and low-pressure water-ingress barriers where design compression, rather than high recovery force, maintains sealing. EPDM retains superior hot-air aging at 120 °C, while this SEBS grade should operate below 90 °C for continuous service.
Against TPV, the TPE-S material is generally easier to color, has lower density, and avoids residual cure-system chemistry. TPV shows lower compression set at 100 °C and better resistance to hot oils. Against TPU, the TPE-S compound has lower density, lower moisture sensitivity, and easier overmolding onto polyolefin substrates; TPU has higher tensile and abrasion resistance, with tear strength often above 50 kN/m compared with the 25–35 kN/m class-typical range for this SEBS compound.
For overmolding onto polypropylene, the polyolefin phase in the SEBS compound promotes interfacial compatibility. Adhesion to ABS, polycarbonate, and polyamide is generally lower and may require mechanical anchors, primers, or tie-layer design. Mold surface texture influences perceived bond quality: smooth polished steel can produce gloss variation and highlight knit lines, whereas matting agents and coarse grain hide flow marks and improve grip. In production, contamination with incompatible polyamide or acrylic regrind causes delamination that cannot be corrected by drying alone; feed-stream segregation is required.
Within the BADAFLEX TPE-S product line, the 80A 1032 grade differs from adjacent hardness grades primarily in hardness, tensile, and compression set. A 70A variant will show lower tensile strength and higher elongation, while a 90A variant will show higher tear and lower compression set. The suffix 1032 differentiates flow length and stabilization from other 80A suffixes, but published numerical data for this specific configuration is limited. Selection should therefore be made against the manufacturer’s current technical datasheet rather than adjacent grade assumptions.
