Celcon M25: specs and equivalent grades
Celanese high molecular weight acetal copolymer (POM-C) for extrusion and selected injection molding where toughness matters. Published data, grades from other producers to ask about, and how to request a quote from one gaylord.
Request a QuoteThe short answer
Celcon M25 is Celanese’s high molecular weight acetal copolymer (POM-C), with higher toughness and impact resistance than the standard grades, used mainly for extrusion and for selected injection molding. Celanese cross-references Hostaform C 2521. Published melt volume rate is 2.2 cm³/10 min, measured at 190°C / 374°F, 2.16 kg, ISO 1133 (the same sheet lists MFR 2.5 g/10 min by ASTM D1238), and density is 1.41 g/cm³ (ISO 1183). Grades from other producers to ask about include Duracon M25-44, Ultraform H4320 AT and Ultraform H2320 006 AT. They are not identical, so compare the data sheets and run a trial before switching.
Also written as: Celcon M25 natural is the base grade. Celcon M25UV (UV stabilized) appears on data sheet hosts as a separate grade, not a color code. Celanese cross-references Hostaform C 2521. Quote the full code from your drawing or bag label; color and additive suffixes change the grade.
Buying Celcon M25: one gaylord to a railcar · supplier COA on every prime lot · ships from 22+ partner warehouse locations · a polymer chemist checks the grade code before we quote · we aim to quote within one to three business days
Have a part number or drawing callout?
Paste it as written. A polymer chemist will tell you which grade it calls for, suggest equivalents and quote it by email.
Celcon M25 specs from the data sheet
Typical values checked against Celanese’s Chemille database on October 31, 2026, from Celanese’s Celcon M25 data as reproduced by a data sheet host (Susheng, in UL Prospector format), checked October 2026. Extrusion settings and the Vicat value come from the 2008 Ticona (Celanese) data sheet. Typical values are not specifications; the lot COA shows what you actually receive. Values only compare at the same test method and condition.
| Property | Value | Test method or note |
|---|---|---|
| Producer (brand owner) | Celanese | Celanese 10-K; the 2008 sheet is branded Ticona, a business of Celanese |
| Polymer | Acetal copolymer (POM-C), high molecular weight | ISO 1043: POM |
| Process | Extrusion; selected injection molding | Data sheet |
| Melt flow | MVR 2.2 cm³/10 min; MFR 2.5 g/10 min | MVR: 190°C / 374°F, 2.16 kg, ISO 1133. MFR: ASTM D1238 (condition not shown on the copy) |
| Density | 1.41 g/cm³ | ISO 1183 |
| Tensile modulus | 2,460 MPa (357,000 psi) | ISO 527-2/1A, 1 mm/min |
| Tensile stress at yield / strain at yield | 62 MPa (8,990 psi) / 13 % | ISO 527-2/1A, 50 mm/min |
| Flexural modulus | 2,430 MPa (352,000 psi) | ISO 178, 23°C |
| Notched Charpy impact, 23°C | 9.1 kJ/m² | ISO 179/1eA |
| Unnotched Charpy impact, 23°C / -30°C | 250 (local fracture) / 190 kJ/m² | ISO 179/1eU |
| Notched Izod impact, 23°C | 8.3 kJ/m² | ISO 180/1A |
| HDT 1.8 MPa | 94°C / 201°F (110°C by ASTM D648) | ISO 75-2/A, not annealed |
| Vicat softening temperature | 161°C / 322°F | ISO 306, B50 (2008 sheet) |
| Melting temperature | 166°C / 331°F | ISO 11357-3, 10°C/min |
| Mold shrinkage, flow / normal | 2.2 % / 1.8 % | ISO 294-4 |
| Water absorption, saturation / 50% RH | 0.75 % / 0.20 % | ISO 62, 23°C |
| Tensile creep modulus, 1 h / 1,000 h | 2,100 / 1,100 MPa | ISO 899-1 |
| Flammability | Not on the data sheet copy we used, which lists UL yellow card E38860-239310. Check the card for current ratings. | |
| Drying | 80–100°C (176–212°F) for 3 h. The 2008 sheet says drying is not normally required, but material that has picked up moisture (poor storage, regrind) may need it to prevent splay and odor. | Data sheet; 2008 sheet |
| Melt temperature, injection molding | 180–200°C (356–392°F); the 2008 sheet says never above 230°C (446°F) | Data sheet; 2008 sheet |
| Mold temperature | 80–120°C (176–248°F); the 2008 sheet prefers 82–93°C (180–199°F) for walls under 1.5 mm | Data sheet; 2008 sheet |
| Extrusion | Melt 180–230°C (356–446°F) for profile; 160–220°C (320–428°F) for film; 180–190°C (356–374°F) for sheet. Extruder L/D of at least 20:1 and a screw compression ratio of at least 3:1, preferably 4:1 | 2008 Ticona sheet |
| Food contact | The data sheet copy makes no food-contact statement. Ask for Celanese’s regulatory letter for the exact grade and color. |
Source data sheets are listed at the bottom of this page. Confirm against the current sheet for your exact grade code and color.
Grades to ask about instead of Celcon M25
These grades from other producers have similar published specs. None is a drop-in replacement: additive packages, flow at molding shear rates, color and approvals differ. If your part, drawing or customer approval names Celcon M25, any change needs your approval and usually a trial.
| Grade | Producer | Melt flow | Density | Key property | How it compares |
|---|---|---|---|---|---|
| Duracon M25-44 | Daicel (formerly Polyplastics) | MFR 2.5 g/10 min (190°C / 374°F, 2.16 kg, ISO 1133) | 1.41 g/cm³ (ISO 1183) | Tensile modulus 2,500 MPa (ISO 527); flexural modulus 2,350 MPa (ISO 178); notched Charpy 8.0 kJ/m² (ISO 179/1eA); HDT 90°C at 1.8 MPa (ISO 75) | Close match on flow and density. Daicel’s standard high-viscosity grade, UL 94 HB. Slightly lower stiffness, impact and HDT on the sheet, and higher listed shrinkage (2.7 % flow / 2.3 % transverse on a 60 × 60 × 2 mm plaque). Daicel took over the Polyplastics engineering plastics business in April 2026. Quote this alternative › |
| Ultraform H4320 AT | BASF | MVR 2.2 cm³/10 min; MFR 2.6 g/10 min (190°C / 374°F, 2.16 kg, ISO 1133) | 1.40 g/cm³ (ISO 1183) | Tensile modulus 2,400 MPa; yield stress 60 MPa (ISO 527); notched Charpy 6.5 kJ/m² (ISO 179/1eA); HDT 90°C at 1.8 MPa (ISO 75) | Partial match for extrusion. BASF’s high molecular weight grade for extruding semifinished products, including thick-walled stock at high output; also listed for injection molding. Same MVR; lower notched impact and stiffness. Quote this alternative › |
| Ultraform H2320 006 AT | BASF | MVR 2.9 cm³/10 min; MFR 3.4 g/10 min (190°C / 374°F, 2.16 kg, ISO 1133) | 1.41 g/cm³ (ISO 1183) | Tensile modulus 2,600 MPa; yield stress 62 MPa (ISO 527); notched Charpy 6.5 kJ/m² (ISO 179/1eA); HDT 95°C at 1.8 MPa (ISO 75) | Partial match for molding. High molecular weight grade with slightly higher flow, for injection molding of thick-walled parts; BASF also lists extrusion. Stiffer than M25, with lower notched impact. Quote this alternative › |
From each producer’s published data: a distributor copy of the Duracon M25-44 sheet and BASF’s September 2025 Ultraform product range brochure. Brand owners and grade names change; confirm on the current data sheet.
Typical uses for Celcon M25
From Celanese’s description and the extrusion sections of the 2008 data sheet:
- Profile extrusion
- Sheet extrusion
- Film extrusion
- Selected injection-molded parts that need higher toughness and impact resistance
What to check before you switch
- Low flow: M25 has about a tenth of the melt volume rate of Celcon M270 (2.2 vs 23 cm³/10 min). It is not a stand-in for a standard injection grade in thin-wall tools; for general molding see Celcon M90.
- Same producer, other name: Celanese cross-references Hostaform C 2521. Ask Celanese whether a Hostaform lot is accepted under your Celcon approval.
- Duracon M25-44 lists higher shrinkage (2.7 % / 2.3 % on a 60 × 60 × 2 mm plaque) than M25 (2.2 % / 1.8 %, ISO 294-4). Check dimensions on first articles or first extruded lengths.
- Pick the BASF grade by process: H4320 AT is BASF’s extrusion grade for semifinished stock; H2320 006 AT is aimed at thick-walled moldings.
- Screw design matters with this grade. The 2008 sheet calls for a high-compression screw (at least 3:1) and warns that a low-compression screw can leave unmelted particles.
- Keep acetal away from PVC in the same barrel and purge thoroughly between them; the two degrade each other.
- Compare melt flow, density and impact only at the same test condition and method (ASTM vs. ISO results differ).
- Ask for the producer’s food-contact or regulatory letter for the exact grade if the part needs one.
- Run a trial lot and check shrinkage, cycle time and appearance before you switch production.
Buying Celcon M25: price, lead time and lot size
- Lot size. From one gaylord to a railcar. See gaylord, LTL and truckload for typical weights per box.
- Where it ships from. 22+ partner warehouse locations. Material already in a partner warehouse usually moves sooner than a grade that has to come from the producer; your quote says which applies.
- Price. We do not publish prices because they move with feedstock, freight and order size. What moves your price most: lot size, color, ship-to region, and whether you need Celcon M25 itself or can accept a matched alternative. See how resin is priced and the monthly market update.
- Paperwork. Supplier COA on every prime lot (what a COA shows). Ask for the producer’s regulatory letter or UL file if your part needs them.
- Trying an alternative? Start with one gaylord as a trial lot, molded and checked before you commit a full release.
- If Celcon M25 itself is not available. Some branded grades are sold only through the producer’s own channels or go on allocation. If we cannot source it, we tell you, then quote a matched alternative with a side-by-side comparison.
Send the grade code, your annual volume and ship-to location. A polymer chemist checks it before we quote; we have been in the resin business for 30+ years. For several grades at once, use the resin RFQ template.
Trade names belong to their owners. ResinBridge is not affiliated with these producers; grade names are used only to identify the material. Data reflects published sheets as of October 2026.
Sources
- Celanese Chemille database: Celcon M25 (producer data, checked Oct 31, 2026)
- Celanese Celcon M25 data sheet (Susheng copy of the producer data)
- Ticona (Celanese) Celcon M25 data sheet, 2008 (PDF)
- Celanese 10-K, fiscal 2021 (Celcon and Hostaform acetal)
- Polyplastics Duracon M25-44 data sheet (distributor copy, PDF)
- BASF Ultraform (POM) product range brochure, September 2025 (PDF)
- TOPAS / Daicel: Polyplastics business merged into Daicel, February 2026
Common questions
What is Celcon M25?
Celcon M25 is Celanese’s high molecular weight acetal copolymer (POM-C), with higher toughness and impact resistance, used mainly for extrusion and selected injection molding. Celanese cross-references Hostaform C 2521.
What is the melt flow of Celcon M25?
MVR 2.2 cm³/10 min, measured at 190°C / 374°F, 2.16 kg, ISO 1133. The same sheet lists MFR 2.5 g/10 min by ASTM D1238.
What is equivalent to Celcon M25?
Grades from other producers to ask about include Duracon M25-44, Ultraform H4320 AT and Ultraform H2320 006 AT. None is identical; compare data sheets and run a trial, and get approval if your part names Celcon M25.
Is Celcon M25 for extrusion or injection molding?
Both. Celanese describes it as primarily for extrusion and selected injection molding applications. The 2008 sheet gives settings for profile, sheet and film extrusion as well as molding.
Can ResinBridge supply Celcon M25?
We quote Celcon M25 when our supply partners can source it. If they cannot, we say so up front and quote a matched alternative, named on the quote with its data sheet, so you can decide whether to trial it.
If your grade is not listed, tell us what you run. We source commodity, engineering and specialty resins.
Need Celcon M25 or an equivalent?
A polymer chemist reviews every request, then matches your grade or finds a matched alternative and prices it.
What to send for an accurate quote
- The grade name, from any supplier, or a data sheet
- Color (natural, black or a custom match)
- Fill type and percentage, if any
- Melt flow, if you know it
- Quantity for this order and what you use in a year
- Ship-to city and state or province
Quote Celcon M25 or a matched alternative
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