Quick answer. A PU gasket dispensing machine (FIPFG, or Formed-In-Place Foam Gasket system) robotically applies a two-component polyurethane foam bead that cures into a precise, seamless seal directly on your part. For electrical enclosures, air filters and automotive sealing, choose a system by matching mix accuracy (±1–2%), shot output, bead repeatability and the dispense path (2-axis vs. 3-axis/6-axis robot) to your part geometry and production volume. Buying directly from the machine manufacturer lets you specify the mixing head, metering pumps, robot envelope and certifications to your exact application.
What is a PU Gasket Dispensing Machine (FIPFG)?
FIPFG technology replaces die-cut or extruded gaskets with a foam seal that is mixed and dispensed in liquid form, then foams and cures in place on the substrate. A FIPFG machine consists of three core subsystems: precision metering pumps for the polyol (resin) and isocyanate components, a dynamic or static mixing head, and a motion platform — typically a Cartesian gantry or articulated robot — that traces the seal path on the part.
Because the gasket bonds to the part as it cures, there is no separate handling, no adhesive lamination, and almost zero material waste compared with stamping. This is why FIPFG dominates high-mix sealing in electrical cabinets, IP-rated junction boxes, HVAC and engine air-filter frames, lighting housings, and automotive trim and body-in-white components. The cured polyurethane gasket delivers reliable compression set, dust and water ingress protection, and EMI/vibration damping.
Two foam chemistries are common: polyurethane (PU) for soft, high-recovery seals and silicone (PU/silicone hybrid lines) for high-temperature or UV-exposed parts. Most enclosure and filter makers standardize on PU for its cost and adhesion. If you need a flexible, recoverable cellular seal, the mechanical behavior is benchmarked against cellular-material standards published by ASTM International.
Where FIPFG Sealing Wins: Three Buyer Profiles
Electrical enclosures & junction boxes
Enclosure manufacturers need consistent IP54–IP67 sealing across hundreds of cabinet sizes. A FIPFG cell dispenses the exact bead each panel requires, eliminating gasket inventory for every SKU. The seal follows complex perimeters, screw bosses and cable-entry cutouts that a die-cut gasket cannot economically match.
Air filters & HVAC frames
Panel and cartridge filter producers run high volumes where bead speed and pot-life control matter most. FIPFG bonds the seal to the filter frame in one pass, ensuring no bypass air leaks around the media — critical for cabin, engine intake and cleanroom filtration.
Automotive sealing
Tier-1 and Tier-2 suppliers use FIPFG for headlamp housings, control modules, battery-pack lids and HVAC components, where PPAP-level repeatability and traceability are mandatory. Here a 6-axis robot and closed-loop metering are usually required to hold tolerances on 3D contoured surfaces.
Key Specifications to Compare Before You Buy
Procurement teams should request a written specification sheet for every quoted machine and compare these parameters side by side. The table below shows typical ranges across entry, mid-range and high-end FIPFG systems.
| Specification | Entry / 2-Axis | Mid-Range / 3-Axis | High-End / 6-Axis Robot |
|---|---|---|---|
| Mixing ratio accuracy | ±2% | ±1–1.5% | ±0.5–1% (closed-loop) |
| Output (shot rate) | 0.5–3 g/s | 2–8 g/s | 5–20 g/s |
| Bead width range | 2–8 mm | 1.5–12 mm | 1–15 mm |
| Mixing head | Static / fixed | Dynamic, cleanable | Dynamic, self-cleaning |
| Metering pump type | Gear | Gear / piston | Servo piston, flow-monitored |
| Path complexity | Flat 2D perimeters | 2.5D with height steps | Full 3D contour |
| Typical applications | Small enclosures, filters | Mixed enclosures, HVAC | Automotive, multi-shift OEM |
| Indicative lead time | 4–8 weeks | 8–12 weeks | 12–20 weeks |
The single most important number is mixing ratio accuracy. A 2-component PU foam is unforgiving: a few percent of drift on the isocyanate side changes cure speed, foam density and adhesion. Closed-loop systems that monitor flow on both components and correct in real time are worth the premium for any safety- or warranty-critical seal.
Mixing Technology: Static vs. Dynamic Heads
The mixing head determines seal quality more than any other component. A static (disposable) mixer blends the two streams through a fixed helical element. It is cheap and clean but limits how aggressively you can vary bead size and output, and the consumable adds running cost.
A dynamic mixing head uses a motor-driven rotor to shear-mix the components, giving finer cell structure, faster reaction control and the ability to start/stop the bead cleanly thousands of times per shift. Self-cleaning dynamic heads flush automatically, which is essential for unattended or multi-shift operation. For air-filter and enclosure lines running tens of thousands of parts, the dynamic head pays for itself in reduced scrap and downtime.
Ask any supplier to demonstrate bead start/stop repeatability on your actual part — this is where cheap machines fail, leaving a thin or fat spot at the seal closure that becomes a leak path.
Safety, Chemistry & Compliance You Cannot Ignore
FIPFG uses isocyanate-based chemistry, which is regulated worldwide. In the EU, diisocyanates are subject to a REACH training and handling restriction enforced by the European Chemicals Agency (ECHA); operators must be trained before working with these materials. In the US, employer exposure controls and respiratory protection requirements are set out by the Occupational Safety and Health Administration (OSHA).
A well-engineered FIPFG machine helps you comply by enclosing the mixing head, providing sealed material reservoirs with nitrogen blanketing, and including local exhaust ventilation interfaces. When you buy, confirm the machine ships with the documentation, interlocks and fume-extraction connections your jurisdiction requires. A manufacturer that integrates these from the factory saves you a costly retrofit and a failed audit.
Total Cost of Ownership & Buying Direct from the Manufacturer
The sticker price of a FIPFG cell is only part of the picture. Build a TCO model that includes:
- Material efficiency — FIPFG typically wastes under 5% of material vs. 30–50% scrap for die-cut gaskets.
- Consumables — static mixer tips, filters, seals and solvent for cleaning.
- Throughput vs. takt time — does one cell meet your line rate, or do you need two?
- Maintenance & spare parts — pump rebuild intervals, head service kits, and local technical support.
- Training & commissioning — on-site setup, operator training and process validation.
This is where buying direct from the machine manufacturer changes the economics. A direct OEM relationship lets you specify the mixing head, robot envelope, metering pumps and safety package to your part — instead of accepting a distributor’s standard configuration. You get factory pricing, faster spare-part supply, engineering support during commissioning, and the option to customize the dispense path program for new SKUs without paying integrator markups. For exporters serving global enclosure, filter and automotive customers, a manufacturer that can certify and ship FIPFG lines directly removes the middleman cost and the support gap.
Explore configurable FIPFG and PU gasket dispensing systems on our polyurethane machinery product range, or request a custom quotation with your part drawing and target output.
A Practical Buyer’s Checklist
- Define your seal path complexity (2D / 2.5D / 3D) before shortlisting machines.
- Demand a documented mixing-ratio accuracy figure and closed-loop monitoring for critical seals.
- Run a sample trial on your part — check bead closure, adhesion and compression set.
- Confirm dynamic vs. static head matches your volume and shift pattern.
- Verify isocyanate safety integration meets ECHA/OSHA or your local regulations.
- Build a 3-year TCO model, not just a purchase-price comparison.
- Prioritize a direct manufacturer with custom engineering, certification and global spare-part support.
FAQ
Q: What is the difference between FIPFG and a traditional die-cut gasket?
FIPFG dispenses a liquid two-component PU foam that cures into a seamless seal bonded directly to your part, while a die-cut gasket is a pre-cut piece that must be handled and bonded separately. FIPFG eliminates per-SKU tooling, cuts material waste to under 5%, and seals complex 3D perimeters that stamping cannot match economically.
Q: Which IP rating can a PU gasket dispensing machine achieve for electrical enclosures?
With correct bead design and compression, FIPFG seals routinely achieve IP54 to IP67 ingress protection. The result depends on the foam’s compression set, the mating-flange design and bead repeatability — which is why mixing-ratio accuracy and start/stop control are the specs that matter most.
Q: Do I need a 6-axis robot, or is a 2-axis gantry enough?
Flat enclosure panels and filter frames usually only need a 2- or 3-axis gantry. Contoured automotive parts, headlamp housings and battery lids with seals on multiple planes require a 6-axis robot to keep the dispense nozzle perpendicular to the surface and hold bead tolerance.
Q: How do I handle the safety requirements for isocyanate-based PU foam?
Use a machine with an enclosed, ventilated mixing head and sealed material reservoirs, train operators per ECHA (EU) or OSHA (US) requirements, and provide local exhaust ventilation. A manufacturer that integrates fume extraction and interlocks at the factory makes compliance far simpler than a retrofit.
Q: Can a machine manufacturer customize a FIPFG line for my specific parts?
Yes. Buying direct lets you specify the mixing head, metering pumps, robot envelope, output rate and safety package to your application — and have the dispense path programmed for your SKUs. This is the main advantage of an OEM relationship over a standard distributor configuration: factory pricing, faster spares and engineering support during commissioning.