Rifeng WF is a closed-cell rigid PMI foam, offered as an industrial-grade structural PMI foam core in 52WF, 75WF and 110WF densities. This hub places the three grades side by side so you can match density, strength and thermal limits to your part before you ask for pricing.
Rifeng WF is a medium cell size, closed-cell rigid PMI foam and is described as the most cost-effective industrial-grade product in the range. Six properties shape most specification and purchasing conversations.
The closed-cell structure keeps resin at the interface instead of letting it soak deeper into the core. Less resin take-up means a lower final part weight and reduced overall cost.
A high strength-to-weight ratio makes the core a practical choice for lightweight parts that are still subject to mechanical stress.
Robust thermal stability supports reliable results across different manufacturing techniques, with dimensional stability maintained up to 180 °C.
The grade is engineered specifically for seamless integration with prepreg processing, and the same core is also used in resin infusion and RTM routes.
Cure and processing capability reaches temperatures up to 130 °C and pressures of 0.3 MPa, which covers many standard prepreg, infusion and RTM cycles.
The foam can be thermoformed or CNC machined to meet stringent tolerances, and is supplied as pre-shaped, ready-to-use cores in simple or complex geometries.
All three grades share the same closed-cell PMI chemistry and the same heat distortion resistance class. Density is the lever that separates them, and every mechanical value rises with it.
| Property | Test method | Unit | Rifeng 52WF | Rifeng 75WF | Rifeng 110WF |
|---|---|---|---|---|---|
| Density | ISO 845 | kg/m³ | 52 ± 12 | 75 ± 15 | 110 ± 20 |
| Compressive strength | ISO 844 | MPa | 0.75 | 1.45 | 3.50 |
| Tensile strength | ASTM D638 | MPa | 1.65 | 2.45 | 3.50 |
| Elastic modulus | ASTM D638 | MPa | 65 | 90 | 160 |
| Elongation at break | ASTM D638 | % | ≥ 2.5 | ≥ 2.5 | ≥ 2.5 |
| Flexural strength | ASTM D790 | MPa | 1.55 | 2.40 | 4.60 |
| Shear strength | ASTM C273 | MPa | 0.70 | 1.25 | 2.20 |
| Shear modulus | ASTM C273 | MPa | 20 | 35 | 55 |
| Heat distortion resistance | DIN 53424 | °C | ≈ 180 | ≥ 180 | ≥ 180 |
Values are typical for the Rifeng WF series. Confirm the current data set for your project before you freeze a specification, especially where the ± tolerances on density sit close to a performance threshold.
Start from the load case, not from the density column. Two scenario questions usually shortlist a grade: how much compression and bending the core has to carry, and whether the heat distortion limit is inside the process window.
| Requirement signal | Start with | Why |
|---|---|---|
| Lowest weight wins, modest mechanical load | 52WF | Lowest density at 52 kg/m³ with 0.75 MPa compressive and 0.70 MPa shear strength |
| Balanced stiffness for general sandwich panels | 75WF | Mid density with 1.45 MPa compressive, 2.40 MPa flexural and 1.25 MPa shear strength |
| Highest load, hard points and compression-critical skins | 110WF | 3.50 MPa compressive, 4.60 MPa flexural, 2.20 MPa shear and a 160 MPa elastic modulus |
| Service temperature near 180 °C | Any WF grade | Heat distortion resistance is ≈ 180 °C to ≥ 180 °C across the range, so load and weight decide instead |
Process limits are a second filter: prepreg, infusion and RTM all run at up to 130 °C and 0.3 MPa on this core, so a stiffer grade can be chosen purely on load without narrowing the process route.
The process route rarely changes the grade, but it does change the core format you should ask for and the tolerance you can hold. Match the route first, then confirm sheet size and thickness.
Engineered specifically for seamless integration with prepreg techniques, running within the 130 °C and 0.3 MPa window.
The closed-cell structure limits resin take-up to the core interface, which keeps the finished part lighter and the resin cost lower.
The same thermal and pressure capability applies, so one grade can serve prepreg, infusion and RTM production lines.
The foam can be easily thermoformed, which is useful when the part has curvature or a compound shape.
Cores can be CNC machined to meet stringent tolerances and delivered pre-shaped and ready to use.
Engineered to provide consistent performance in large-scale industrial manufacturing, which matters when a program ramps.
| Product | Sheet size (mm) | Thickness (mm) |
|---|---|---|
| 52 WF | 2500 × 1250 | 1 – 120 |
| 75 WF | 2500 × 1250 | 1 – 110 |
| 110 WF | 2300 × 1250 | 1 – 90 |
Sheets 1 – 4 mm thick are supplied in 1/4 or 1/2 sheet size. Thickness tolerance is ± 0.2 mm, and length / width tolerance is ± 2 mm — worth checking against your bond-line and vacuum-bag requirements before ordering.
The series is aimed at industrial programs where cost per part and repeatable output matter as much as mechanical performance.
Named as a primary use on the product page. Longer blade structures benefit from the weight saving that comes with low resin take-up, and from a grade ladder that scales strength with density.
Also named as a primary use. Panel programs are volume-sensitive, which is where the cost-effective industrial positioning of the WF series becomes the deciding factor.
The stated high strength-to-weight ratio suits lightweight components that still carry load. Choose 52WF for the lightest build, 75WF for balance, 110WF when local loads are high.
Rifeng WF is sold on a quote basis through the product page — there is no online checkout — so the fastest route is to send your grade, format and volume in one message.
Compare 52WF, 75WF and 110WF against your load case and pick the density band that satisfies it with the least weight.
Give the sheet size, thickness within the 1 – 120 / 1 – 110 / 1 – 90 mm range, and whether you need pre-shaped or CNC-machined cores.
Use the quote button on the product page or contact the team directly for industrial volumes, custom geometries and project support.
Send the grade, thickness, quantity and cutting requirement — the team replies with current pricing and lead time.
Keep adjacent product options together for a faster catalog comparison.
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View productthey are three densities of the same closed-cell pmi foam. density rises from 52 kg/m³ to 75 kg/m³ and 110 kg/m³, and mechanical performance rises with it — compressive strength goes from 0.75 mpa to 1.45 mpa and 3.50 mpa, flexural strength from 1.55 mpa to 2.40 mpa and 4.60 mpa, and shear strength from 0.70 mpa to 1.25 mpa and 2.20 mpa. pick the lowest density that still carries your load.
rifeng wf is a closed-cell rigid polymethacrylimide (pmi) foam with a medium cell size. it is completely free of cfcs and is positioned as the most cost-effective industrial-grade product in the range.
processing capability reaches temperatures up to 130 °c and pressures of 0.3 mpa. separately, heat distortion resistance is quoted as approximately 180 °c for 52wf and at least 180 °c for 75wf and 110wf, which is the figure to check against your cure cycle.
it is engineered for prepreg processing and is also used in resin infusion and rtm. the core can additionally be thermoformed or cnc machined, and is available as pre-shaped, ready-to-use cores in simple or complex geometries.
52 wf and 75 wf are supplied at 2500 × 1250 mm with thicknesses of 1 – 120 mm and 1 – 110 mm respectively, while 110 wf is supplied at 2300 × 1250 mm with thicknesses of 1 – 90 mm. sheets 1 – 4 mm thick come in 1/4 or 1/2 sheet size, with thickness tolerance of ± 0.2 mm and length / width tolerance of ± 2 mm.
orders are quote-driven. use the quote request on the rifeng wf product page or send your grade, thickness, sheet or cut geometry and volume through the contact page, and the team will respond with pricing and lead time.
