The broad relief this desk described two sessions ago has partly reversed: four of nine names now sit under RSI 40 — Dow ($DOW), LyondellBasell ($LYB), Air Products ($APD) and the sector ETF ($XLB) — up from one two scans ago, and Air Products just lost its 200-day average, flipping from a +0.9% cushion to a -1.0% deficit, the week's one clean new structural break. LyondellBasell, which broke its own 200-day last scan, kept sliding — its breach widened from -2.5% to -5.8% on the cohort's worst single day today at -3.39%. Dow's breach deepened again to -12.2%, still the cohort's widest. Against that, Ecolab ($ECL) is now the cohort's cleanest short-term story: its trend classifier upgraded to strong-up with a confirmed golden cross, and it posted the cohort's best week at +3.72%. Linde ($LIN) picked up a newly confirmed death cross this scan even as its price and one-year return both improved slightly — the same kind of tag-versus-tape gap DuPont ($DD) has carried for three scans running, where a strong-down tag sits on top of the cohort's best year (+40.81%) and best alpha (+23.59). No news pull for any of the nine names ties this week's split to a specific cause.

Data as-of the 2026-09-25 close for all nine tickers, including the sector ETF ($XLB). All numbers from the pre-computed chemicals summary. Comparison scan: the September 23, 2026 close.

Two scans ago this cohort cleared almost entirely out of the deep-oversold band it had been compressed into, with only LyondellBasell left under RSI 40. That relief only partly held. Today four of nine names sit under 40 — Dow (37.5), LyondellBasell (35.5), Air Products (36.6) and the sector ETF (38.0) — while the other five range from 45.8 to 54.3. The split lines up closely with the same two feedstock-exposed names flagged last scan: Dow and LyondellBasell both continue to weaken, and Air Products joined them this week with a fresh structural break rather than a momentum wobble.

Air Products is the new development. Its cushion above its 200-day, which had widened from a razor-thin 0.1% to 0.9% last scan, flipped negative to -1.0% this week — the cohort's one clean new break. Its trend classifier downgraded from weak-down to down, and its RSI dropped from 41.3 to 36.6, back into the oversold band. LyondellBasell, which broke its own 200-day last scan (the prior week's one clean break), kept sliding: the breach widened again from -2.5% to -5.8%, and today's -3.39% decline was the cohort's worst single session. Dow's breach, already the cohort's widest, deepened again from -10.1% to -12.2%, even as its RSI ticked down to 37.5. Dow does have a fresh September 25 news pull, but it returned only an earnings-report page and Dow's own investor-relations index — nothing naming a cause for this week's continued decline. None of the nine names carries a receipt tying this week's moves to a specific event.

Set against that, five names improved, and Ecolab did more than that — its trend classifier upgraded from weak-down to a confirmed strong-up with a golden cross, its RSI rose from 49.9 to 54.3, and its 7-day return of +3.72% is the cohort's best this scan. Its cushion above its 200-day, reclaimed last scan at +1.3%, widened further to +2.2%. Sherwin-Williams also strengthened, narrowing its 200-day gap from -2.1% to -1.3% on the cohort's best single day today (+2.72%), though its alpha (-20.45) remains the cohort's worst by a wide margin even as its trend tag stays at "down." PPG narrowed its own gap slightly (-4.1% to -3.9%) with a steady, unremarkable week.

Linde is the name worth flagging precisely this scan: its price, one-year return and 7-day change all improved slightly, yet its trend classifier downgraded further from down to strong-down and it picked up a newly confirmed death cross — a technical signal moving the opposite direction from the tape underneath it. That is the same kind of disconnect DuPont has now carried for three scans running: DuPont's one-year return improved again to 40.81% with alpha at 23.59, both cohort bests by a wide margin, while its trend tag remains strong-down with an already-confirmed death cross. The sector ETF itself continues to lag every name with an intact long record — its own 200-day gap widened slightly from -0.4% to -1.5%, dragged down by Dow and LyondellBasell's continued weakness even as five of the nine underlying names improved.

• Dow: RSI 41.5→37.5 (dropped back into the oversold band), trend strong-down unchanged, death cross still confirmed, price $28.65→$28.02, 7D -4.75%→-2.47% (less severe but still negative), 30D -8.87%→-7.62% (roughly flat), vs 200-day -10.1%→-12.2% (deepened again — still the cohort's widest breach), 1Y +25.33%→+26.22% (roughly flat), alpha +9.56→+9.0 (roughly flat). Its fresh September 25 news pull returned only overview and earnings-report pages, no event naming this week's decline.
• LyondellBasell: RSI 39.9→35.5 (dropped further), trend down unchanged, price $59.97→$58.14, 7D -7.6%→-6.12% (still deeply negative), 30D -8.02%→-7.15% (roughly flat), vs 200-day -2.5%→-5.8% (breach widened further after losing the line last scan), 1Y +19.06%→+18.7% (roughly flat), alpha +3.29→+1.48 (eased) — fell 3.39% today, the cohort's worst single day.
• Sherwin-Williams: RSI 44.5→48.7 (rose), trend down unchanged, price $326.46→$329.10, 7D +1.56%→+2.61% (improved), 30D -5.85%→-5.61% (roughly flat), vs 200-day -2.1%→-1.3% (narrowed further, closing in on a reclaim), 1Y -5.22%→-3.23% (improved), alpha -20.99→-20.45 (roughly flat, still the cohort's worst) — rose 2.72% today, the cohort's best single day.
• Air Products: RSI 41.3→36.6 (dropped back into the oversold band), trend weak-down→down (downgraded), price $286.97→$281.76, 7D -0.04%→-0.85% (roughly flat), 30D -6.29%→-8.12% (worsened), vs 200-day +0.9%→-1.0% (flipped negative this scan — the week's one new structural break), 1Y +3.76%→+6.01% (improved), alpha -12.02→-11.21 (roughly flat).
• Linde: RSI 45.6→46.2 (roughly flat), trend down→strong-down (downgraded, a death cross newly confirmed this scan), price $469.72→$469.89 (roughly flat), 7D +1.65%→+2.06% (improved slightly), 30D -4.14%→-4.17% (flat), vs 200-day -2.9%→-3.0% (roughly flat, still below), 1Y -2.13%→-0.82% (improved, nearing positive), alpha -17.9→-18.04 (roughly flat) — price and year both improved even as the technical tag downgraded.
• Ecolab: RSI 49.9→54.3 (rose), trend weak-down→strong-up (upgraded, golden cross confirmed), price $276.72→$279.49, 7D +0.96%→+3.72% (improved sharply, the cohort's best week this scan), 30D -3.58%→-3.82% (roughly flat), vs 200-day +1.3%→+2.2% (widened further on last scan's reclaim), 1Y +4.1%→+4.58% (roughly flat), alpha -11.67→-12.64 (roughly flat, still negative despite the strong-up tag).
• PPG: RSI 43.9→45.8 (rose slightly), trend down unchanged, price $107.20→$107.52, 7D +2.11%→+2.87% (improved), 30D -5.33%→-6.03% (roughly flat), vs 200-day -4.1%→-3.9% (roughly flat, slight narrowing), 1Y +0.9%→+3.46% (improved), alpha -14.87→-13.75 (improved slightly). Its news pull remains stale since June 21 with a stamped 429 rate-limit failure — not evidence of no news.
• DuPont: RSI 46.0→48.7 (rose), trend strong-down unchanged (the tag stays downgraded for a third straight scan even as price and the long record both improved further), price $130.88→$131.71, 7D +2.59%→+2.09% (eased slightly, still the cohort's second-best week), 30D -4.24%→-4.54% (roughly flat), vs 200-day -4.7%→-4.2% (narrowed slightly), 1Y +34.64%→+40.81% (improved further, still the cohort's best by a wide margin), alpha +18.86→+23.59 (improved further, still the cohort's best).
• XLB (ETF): RSI 40.6→38.0 (eased back into the oversold band), trend down unchanged, price $50.28→$49.80, 7D -0.16%→-0.38% (roughly flat), 30D -6.16%→-7.21% (worsened slightly), vs 200-day -0.4%→-1.5% (widened slightly — the sector instrument slipped further from its line rather than closing the gap).

RSI (Relative Strength Index) gauges how aggressively a stock has been bought or sold over roughly the past two weeks, on a 0-100 scale — under 30 signals an oversold, potentially undervalued stretch; over 70 signals overbought, extended risk; readings in between are neutral. Trend reflects a stock's structural direction based on its moving averages over the past several weeks — it is a short-window read, not a verdict on the multi-year story, which is why DuPont can carry the sector's best one-year record and alpha while its trend tag reads "strong-down" for a third straight scan, and why Linde's tag downgraded to strong-down this week even as its price and year both improved. The one-year change, alpha and distance from the 200-day average are the longer-horizon check, and this scan they say something specific: DuPont remains the only name with both an intact long record and a strongly positive alpha; Ecolab is now the cohort's cleanest short-term momentum story, but its alpha (-12.64) is still meaningfully negative, meaning its trend upgrade reflects recent price action, not yet a repaired longer-horizon standing. Nothing here is a setup; these are screen conditions.

Capitulation, RSI under 25: None this scan.

Oversold, RSI 25-40: Dow (37.5), LyondellBasell (35.5), Air Products (36.6) and XLB (38.0) — up from LyondellBasell alone last scan. Air Products' arrival here comes with a fresh 200-day break; Dow's and LyondellBasell's continue a run of structural deterioration that low RSI alone does not describe as a discount.

Neutral to strong, RSI 40+: Sherwin-Williams (48.7), Linde (46.2), Ecolab (54.3), PPG (45.8) and DuPont (48.7). Ecolab is the cohort's highest reading and its trend classifier just turned strong-up. DuPont carries the cohort's best long record despite its still-downgraded tag. Linde's RSI sits mid-band even as its trend classifier just downgraded to strong-down with a newly confirmed death cross.

Does Air Products' new 200-day break confirm on the next session, or does it reclaim the line the way Ecolab did last scan? Do Dow's and LyondellBasell's breaches keep widening past -12.2% and -5.8%, and does either name's news pull ever return an item naming a cause? Does Ecolab's newly confirmed golden cross hold, and does its alpha eventually turn positive to match the trend tag? And does Linde's fresh death cross resolve toward its improving price and year, or does DuPont's three-scan tag-versus-tape gap turn out to be the more durable pattern in this cohort?

• Tape data (price/RSI/SMA/returns/alpha/200-day/1-year/regime): pre-computed summaries as of the 2026-09-25 close — chemicals.
• Comparison figures: 2026-09-23-chemicals (2026-09-23 close).
• Broad-market and materials-sector context (SPY, XLB): market-pulse (same 2026-09-25 close).
• Cross-sector read: airlines, travel-leisure (same close).
• News/event check per ticker: stocks{DOW,LYB,SHW,APD,LIN,ECL,PPG,DD,XLB}/news/latest.json— Dow's pull is fresh (September 25) but returned only overview/earnings-report pages, no event named; DuPont's pull (September 11) is current with no event named; PPG's and XLB's pulls are marked failed (429 rate-limit) and stale since June 21 and April 29 — not evidence of no news; LyondellBasell, Air Products and Ecolab are stale since June or July 9.research/stock-events/` has no entry for any of the nine in this window. Drivers unestablished at the ticker level from this data.