This article focuses on the EU 2027 reverse-switchover for D5/D6. For the ASEAN regulatory read on D4, see our D4 in ASEAN analysis. On 6 June 2027, Commission Regulation (EU) 2024/1328 extends the 0.1% cap on D5 and D6 to every cosmetic category, leave-on products included. Plants in Binh Duong, Bekasi, Bangkok and Selangor are not regulated by Brussels — but a large share of what they fill ends up on European shelves. The date that actually constrains you is not June 2027. It is the three-month stability package that has to finish first. Working backwards from there, the window for choosing a replacement grade closes at the end of December 2026.
Why a European deadline lands on a Southeast Asian line
Commission Regulation (EU) 2024/1328, adopted in May 2024, amends Annex XVII of REACH to cap D4, D5 and D6 at 0.1% by weight in substances and mixtures. Two dates matter: 6 June 2026 for the general restriction, and 6 June 2027 for all remaining cosmetic categories — leave-on products included, and D6 across the board. D5 in rinse-off cosmetics has been capped at the same level since 31 January 2020, so the 2027 change closes the last open door.
No ASEAN member state applies that rule domestically. Three transmission belts carry it onto Southeast Asian production lines anyway:
- Export contract manufacturing. A plant filling for a European brand must deliver to the EU specification regardless of local law. The brand’s regulatory file, not the factory’s location, sets the limit.
- Global formula rationalisation. Multinational brands are steadily dropping region-specific formulations. Maintaining a D5 version for ASEAN and a D5-free version for Europe costs two sets of stability data, two bills of materials and two change-control records. Most have concluded the saving is not worth it.
- ACD convergence. The ASEAN Cosmetic Committee revises its annexes twice a year; the 43rd meeting (12–13 May 2026) produced amendments published on 30 June 2026. D5 is not on the ASEAN prohibited list today — only D4 is, under Annex II — but the direction of travel is one-way.
What the 0.1% limit actually forbids
The restriction is written as a concentration limit rather than an outright ban, and that distinction changes how you audit. A leave-on serum built on cyclopentasiloxane typically carries D5 at 5–30% by weight as the volatile carrier — 50 to 300 times the permitted level. No formulation tweak brings that under 0.1%. The grade has to go.
What the 0.1% threshold is workable for is residual carry-over: cyclics present as trace impurities inside another raw material. That is the number a supplier COA should speak to, and it is where most audits go wrong.
| Hidden D5 / D6 source | What it looks like | What to request |
|---|---|---|
| Elastomer gels | Dimethicone crosspolymer supplied in a cyclopentasiloxane carrier, often 80–90% D5 by design | A D5-free gel, or a cyclics-free carrier version |
| Silicone emulsions | D5 used as the internal oil phase | Per-batch residual D4 / D5 / D6 on the COA |
| Fragrance dilutions | D5 as a volatile solvent in the fragrance compound | Solvent declaration from the fragrance house |
| Pigment dispersions | D5 or D6 in the dispersing or surface-treatment phase | Full compositional breakdown, not just INCI |
Each cyclic is assessed separately: a product containing both D5 and D6 must meet the 0.1% limit for each substance independently.
The nine-month countdown, reverse-engineered
Working back from 6 June 2027 and assuming a conventional three-month accelerated stability package, this is the only sequence that still fits.
| Window | Workstream | Deliverable | Consequence if missed |
|---|---|---|---|
| Sep – Oct 2026 | Formula and raw-material audit | Ranked SKU list with every D5 / D6 source flagged, residuals included | Screening cannot start; everything downstream slips |
| Nov – Dec 2026 | Replacement screening and bench trials | Two to three candidate grades per affected SKU, with sensory panel data | No candidate locked before the stability window opens |
| Jan – Mar 2027 | Accelerated stability and compatibility | Three-month data package at 40°C / 75% RH, plus packaging compatibility | Filing without data; brand owners and regulators will reject it |
| Mar – Apr 2027 | National notification updates | Revised notification numbers in every market served | A compliant product that cannot legally be sold |
| May – 5 Jun 2027 | Line changeover and stock drawdown | Compliant inventory; legacy stock consumed or written off | Non-compliant finished goods in the warehouse on deadline day |
Choosing the replacement: match volatility, not the INCI name
D5 earns its place through a particular combination of volatility, spreading value and solvency. There is no single drop-in substitute — but three grades between them cover most of the map, and the selection is driven by how quickly the carrier needs to leave the skin.
| Grade | INCI | Volatility profile | Best fit | Cyclics status |
|---|---|---|---|---|
| W201 | Dimethicone (volatile grade) | Medium — closest match to the D5 evaporation curve | Skincare, sun care, leave-on emulsions | Residual D4 < 100 ppm, well under the 0.1% cap |
| W202 | Methyl Trimethicone | Fast — dries quicker than D5 | Hair serums, deodorants, dry-touch sprays | Cyclics-free alkyl-modified backbone |
| W203 | Caprylyl Methicone | Slow — partially substantive | Colour cosmetics, pigment wetting, long-wear | Cyclics-free C8 alkyl-modified backbone |
A direct 1:1 swap rarely holds. A faster carrier changes drying time and can pull a film-former out of solution; a slower one leaves a heavier afterfeel and usually needs the thickener system rebalanced. Budget two to three bench iterations per SKU rather than one.
After reformulation: the ASEAN paperwork
In most ASEAN markets a reformulated product is a new notified product. The paperwork, more often than the chemistry, is what causes the delay.
| Market | Authority | What changes after reformulation | Timing note |
|---|---|---|---|
| Vietnam | Drug Administration (DAV) | New cosmetic notification number and full ingredient disclosure | Decree on Cosmetic Management in force from 1 July 2026 |
| Indonesia | BPOM | Notification update; import licence (SKI Border) subject to mandatory testing from 8 January 2026 | Budget additional time for border testing on the first compliant shipment |
| Malaysia | NPRA | Notification update under the Cosmetic Control Guidelines | Circular No. 2/2026 shows amendments can take effect immediately |
| Philippines | FDA | ASEAN cosmetic notification update | Standard processing; grouped submissions recommended |
| Thailand | Thai FDA | Notification update; recheck against the revised prohibited list effective 13 June 2026 | List changes can affect unrelated ingredients in the same formula |
Five things that delay a switchover
Across the switchovers we have supported, the same five issues account for most of the slippage.
- Auditing the formula instead of the raw materials. The D5 usually arrives inside a gel or an emulsion, not from a drum of cyclopentasiloxane on the shelf.
- Underbooking stability capacity. Chamber space is finite in the first quarter. Start stability in February and you queue behind everyone else who started in February.
- Assuming a drop-in replacement exists. Volatility mismatches surface as drying-time and afterfeel complaints, and each correction costs another bench cycle.
- Filing sequentially rather than in parallel. Five markets filed one after another can add months; filed together they add weeks.
- Waiting for ASEAN to list D5 before acting. By the time a substance reaches Annex II, the transition — as Malaysia demonstrated — may be zero.
The legal baseline on the D4 side of this question is set out in our earlier analysis of the ASEAN D4 position; grade documentation for the replacements above is listed under Volatile Silicone Fluids.
FAQ
Is D5 banned in ASEAN today?
No. As of the 30 June 2026 annex update, the only cyclic siloxane on the ASEAN Cosmetic Directive Annex II prohibited list is D4 (octamethylcyclotetrasiloxane, CAS 556-67-2). D5 and D6 are not listed in Annex II or Annex III. The June 2027 deadline applies to plants supplying brands that place products on the EU market, or that have adopted a single global formulation.
We sell only within Southeast Asia. Do we still need to switch?
Only if you export, contract-manufacture for a brand that exports, or supply a customer whose global specification already excludes D5. If your entire output stays inside ASEAN and no customer requires it, there is no legal driver today. But the ACD annexes are revised twice a year and members have adopted changes with no transition period, so the exposure is one of timing rather than principle.
Can we keep D5 by reducing the use level below 0.1%?
Not in any formulation where D5 is doing functional work. Typical use levels as a volatile carrier run from 5% to 30%, which is 50 to 300 times the limit. The 0.1% threshold is realistically only achievable for trace residuals carried in from other raw materials — which is why supplier COAs matter more than the formula sheet.
How much calendar time should we allow for stability testing?
A minimum three-month accelerated programme at 40°C / 75% RH is the usual baseline, with packaging compatibility run in parallel. Some brand owners additionally require real-time data, which extends the window to twelve months. If you are starting after December 2026, assume the accelerated route is the only one that fits before June 2027.