Hostaform C9021: specs and equivalent grades
Celanese standard injection-molding acetal copolymer (POM-C), sold under the Hostaform name outside North America. Published data, grades from other producers to ask about, and how to request a quote from one gaylord.
Request a QuoteThe short answer
Hostaform C9021 (written Hostaform C 9021 by Celanese) is Celanese’s standard injection-molding acetal copolymer (POM-C), with high rigidity, hardness and toughness, good resistance to solvents, fuels, strong alkalis and hydrolysis, and high resistance to thermal and oxidative degradation. Celanese sells its acetal as Hostaform outside North America and as Celcon in North America. Published melt volume rate is 8 cm³/10 min, measured at 190°C / 374°F, 2.16 kg, ISO 1133, and density is 1.41 g/cm³ (ISO 1183). Grades from other producers to ask about include Kepital F20-03, Ultraform N2320 003 AT and Duracon M90-44. They are not identical, so compare the data sheets and run a trial before switching.
Also written as: Hostaform C 9021 (Celanese’s spacing) and Hostaform C9021. The sheet’s ISO 9988 designation is POM-K, M-GNR, 03-002. Quote the full code from your drawing or bag label; color and additive suffixes change the grade.
Buying Hostaform C9021: 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.
Hostaform C9021 specs from the data sheet
Typical values checked against Celanese’s Chemille database on October 31, 2026, from Celanese’s Hostaform C 9021 data sheet as reproduced by a data sheet host (Susheng, in UL Prospector format), checked October 2026. 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 | No ownership change found as of October 2026 (Celanese 10-K) |
| Polymer | Acetal copolymer (POM-C) | ISO 1043: POM; ISO 9988: POM-K, M-GNR, 03-002 |
| Process | Injection molding | Data sheet |
| Melt flow | MVR 8 cm³/10 min | 190°C / 374°F, 2.16 kg, ISO 1133 |
| Density | 1.41 g/cm³ | ISO 1183 |
| Tensile modulus | 2,850 MPa (413,000 psi) | ISO 527-2/1A, 1 mm/min |
| Tensile stress at yield / strain at yield | 64 MPa (9,280 psi) / 9 % | ISO 527-2/1A, 50 mm/min |
| Nominal strain at break | 30 % | ISO 527-2/1A, 50 mm/min |
| Flexural modulus | 2,700 MPa (392,000 psi) | ISO 178, 23°C |
| Notched Charpy impact, 23°C / -30°C | 6.5 / 6.0 kJ/m² | ISO 179/1eA |
| Unnotched Charpy impact, 23°C / -30°C | 220 / 220 kJ/m² | ISO 179/1eU |
| HDT 1.8 MPa | 104°C / 219°F | ISO 75-2/A, not annealed |
| Melting temperature | 166°C / 331°F | ISO 11357-3, 10°C/min (the host copy prints 1166, a footnote marker run into the value) |
| Mold shrinkage, flow / normal | 2.0 % / 1.9 % | ISO 294-4 |
| Water absorption, saturation | 0.65 % | ISO 62, 23°C |
| Tensile creep modulus, 1 h / 1,000 h | 2,500 / 1,300 MPa | ISO 899-1 |
| Electrical | Comparative tracking index 600 V; dielectric strength 35 kV/mm | IEC 60112; IEC 60243-1 |
| Flammability | UL 94 HB for all colors at thicknesses over 1.5 mm; UL 746B relative temperature index 110°C electrical, 90°C mechanical | UL yellow card E42337-234607 |
| Burning rate | Below 75 mm/min at thicknesses over 1 mm | ISO 3795 / FMVSS 302 |
| Drying | 120–140°C (248–284°F) for 3–4 h, to 0.15 % moisture or less | Data sheet processing table |
| Melt temperature | 190–210°C (374–410°F); feed zone 60–80°C (140–176°F) | Data sheet processing table |
| Mold temperature | 80–120°C (176–248°F) | Data sheet processing table |
| Injection settings | Injection and hold pressure 60–120 MPa; slow to moderate injection rate; back pressure 0–4 MPa | Data sheet processing table |
| Food contact | The sheet states that monomers and additives are listed in EU Regulation 10/2011 and that the grade is FDA compliant to 21 CFR 177.2470. Confirm for your exact color with Celanese’s regulatory letter. | Data sheet |
Source data sheets are listed at the bottom of this page. Confirm against the current sheet for your exact grade code and color.
The Hostaform sheet’s drying temperature (120–140°C) is higher than the 80–100°C on Celanese’s Celcon M270 and M25 sheets. Follow the sheet for the grade you actually run.
Grades to ask about instead of Hostaform C9021
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 Hostaform C9021, any change needs your approval and usually a trial.
| Grade | Producer | Melt flow | Density | Key property | How it compares |
|---|---|---|---|---|---|
| Kepital F20-03 | Korea Engineering Plastics (KEP) | 9.0 g/10 min (190°C / 374°F, 2.16 kg, ISO 1133) | 1.41 g/cm³ (ISO 1183) | Flexural modulus 2,550 MPa (ISO 178); notched Charpy 6.5 kJ/m² (ISO 179); HDT 100°C at 1.8 MPa (ISO 75) | Close match. KEP’s standard medium-viscosity grade for general injection molding and some extrusion. KEP is owned by Celanese (50%), Mitsubishi Gas Chemical (40%) and Mitsubishi Corp. (10%) and its owners market the resin. The sheet (data provided by KEP Americas) gives no processing settings. Quote this alternative › |
| Ultraform N2320 003 AT | BASF | MVR 7.5 cm³/10 min; MFR 8.8 g/10 min (190°C / 374°F, 2.16 kg, ISO 1133) | 1.41 g/cm³ (ISO 1183) | Tensile modulus 2,700 MPa; yield stress 64 MPa (ISO 527); notched Charpy 6.5 kJ/m² (ISO 179/1eA); HDT 95°C at 1.8 MPa (ISO 75) | Close to partial match. BASF’s rapid-solidifying standard injection grade, with a drinking water listing (cold and warm) per BASF. Slightly lower flow and lower HDT. LEV, XLEV, PRO and BMB versions carry separate codes; confirm which one BASF supplies in North America. Quote this alternative › |
| Duracon M90-44 | Daicel (formerly Polyplastics) | MFR 9 g/10 min; MVR 8 cm³/10 min (190°C / 374°F, 2.16 kg, ISO 1133) | 1.41 g/cm³ (ISO 1183) | Stiffness, impact, HDT and UL rating not verified; ask for Daicel’s current sheet | Partial match on what we could verify: same flow and density. The distributor copy of the sheet we opened shows mechanical values identical to the high-viscosity Duracon M25-44, so we have not listed them; ask for Daicel’s current sheet before comparing stiffness, impact or HDT. Quote this alternative › |
From each producer’s published data: distributor copies of the Kepital and Duracon sheets and BASF’s September 2025 Ultraform product range brochure. Brand owners and grade names change; confirm on the current data sheet.
Typical uses for Hostaform C9021
From Celanese’s data sheet:
- Automotive engineering
- Precision engineering
- Electrical and electronic parts
- Domestic appliances
What to check before you switch
- Hostaform and Celcon: Celanese uses both names for its acetal. Celcon M90 has similar published values (MVR 8 cm³/10 min, HDT 101°C at 1.8 MPa). Ask Celanese whether a lot sold under one name is accepted under an approval written for the other.
- The FDA and EU statements apply to the grade as published. Colors and additive packages can change compliance, so get the letter for your exact code.
- UL 94 HB on this sheet covers walls thicker than 1.5 mm. For thinner walls, check the UL yellow card for your color.
- Kepital F20-03 and Duracon M90-44 sheets give no processing settings in the copies we opened; ask for the full sheet before setting up a tool.
- Acetal shrinks about 2 % and keeps shrinking slightly after molding. Hold mold temperature and pack settings once dimensions are approved.
- 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 Hostaform C9021: 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 Hostaform C9021 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 Hostaform C9021 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: Hostaform C 9021 (producer data, checked Oct 31, 2026)
- Celanese Hostaform C 9021 data sheet (Susheng copy, PDF)
- Celanese 10-K, fiscal 2021 (Celcon and Hostaform acetal)
- KEP Kepital F20-03 data, information provided by KEP Americas (distributor copy, PDF)
- Process Worldwide: Celanese and Mitsubishi Gas Chemical complete KEP restructuring, 2022
- BASF Ultraform (POM) product range brochure, September 2025 (PDF)
- Polyplastics Duracon M90-44 data sheet (distributor copy, PDF)
- TOPAS / Daicel: Polyplastics business merged into Daicel, February 2026
Common questions
What is Hostaform C9021?
Hostaform C9021 (Hostaform C 9021) is Celanese’s standard injection-molding acetal copolymer (POM-C), with high rigidity, hardness and toughness and good resistance to solvents, fuels, strong alkalis and hydrolysis. Celanese uses the Hostaform name outside North America.
What is the melt flow of Hostaform C9021?
MVR 8 cm³/10 min, measured at 190°C / 374°F, 2.16 kg, ISO 1133, per Celanese’s data sheet.
What is equivalent to Hostaform C9021?
Grades from other producers to ask about include Kepital F20-03, Ultraform N2320 003 AT and Duracon M90-44. None is identical; compare data sheets and run a trial, and get approval if your part names Hostaform C9021.
Is Hostaform C9021 food-contact compliant?
The data sheet states that monomers and additives are listed in EU Regulation 10/2011 and that the grade is FDA compliant to 21 CFR 177.2470. Confirm for your exact color and get Celanese’s regulatory letter before production.
Can ResinBridge supply Hostaform C9021?
We quote Hostaform C9021 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 Hostaform C9021 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 Hostaform C9021 or a matched alternative
A polymer chemist checks the data sheet and tells you exactly what you would get before you order.
Request a QuoteNot sure which grade fits your part?
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