Quick answer. To choose a polyurethane casting machine, send suppliers your material data, component ratio, viscosity at processing temperature, required shot size, cycle time and measurable part-quality limits. A FIPFG machine specification checklist must also define bead geometry, dispensing path, substrate, working area and motion accuracy. Require a wet-material factory acceptance test before shipment; a quotation listing only tank volume and motor power cannot prove process capability.
A precise RFQ prevents three expensive mismatches: pumps that cannot meter the actual viscosity, an output figure that ignores shot time, and automation that follows the CAD path but produces an unacceptable gasket bead.
Start the RFQ With the Product and Chemical Process
The machine supplier should size the system around a real part rather than a generic equipment model. Attach a 2D drawing, 3D file when motion is required, finished-part photograph, annual volume, shifts per day, acceptable scrap rate and the plant conditions under which production will run.
State whether the application is dense hot-cast elastomer, cellular elastomer, two-component adhesive or formed-in-place foam gasket. These processes can all meter polyurethane, but their tank heating, degassing, pump design, mixing energy, nozzle geometry and cleaning routines differ substantially.
Material information the supplier must receive
- Component names and current technical data sheets, including whether the system uses an MDI- or TDI-based prepolymer, polyol blend, amine curative or diol curative.
- Mix ratio by weight or volume, with the required adjustment window. Write “100:12 parts by weight,” for example, rather than “approximately 8:1.”
- Viscosity of each component in mPa·s at a stated temperature. A value measured at 25°C cannot be used to select a pump that will meter the same material at 80°C.
- Processing temperature, pot life, cream time, gel time, demolding time and post-cure schedule from the material supplier.
- Moisture limit and storage method. Water reacts with isocyanate and generates carbon dioxide, which can leave bubbles, pinholes or a cellular structure in a nominally solid casting.
- Fillers, pigments or additives, including particle size, loading percentage and settling behavior. An abrasive or settling-filled component may require agitation, a different seal package and shortened circulation dead legs.
Define the product requirement independently from the chemical brand. For a wheel or roller, specify finished mass in kg, minimum wall thickness, core material, Shore hardness and the tensile, tear or abrasion tests used by your customer. Link hardness inspection to ASTM D2240 rather than writing “medium hard.”
For a gasket, state the cured bead width and height in mm, permissible joint mark, adhesion substrate, compression target, enclosure rating and operating temperature. A request for an “IP65 gasket machine” is incomplete because the enclosure, groove, fastener spacing and compression determine the final ingress result.
PU Casting Machine vs FIPFG Dispensing Machine
The selection boundary is the finished article. Dense elastomer casting fills a mold to make wheels, rollers, screens, seals or bushings. FIPFG applies a controlled cellular bead directly onto an enclosure flange or groove, where it rises and cures as the installed gasket.
| RFQ dimension | PU elastomer casting machine | FIPFG gasket dispensing machine |
|---|---|---|
| Typical product | Solid wheel, roller, scraper, screen panel, bushing or molded seal | Foamed gasket on electrical cabinet, filter frame, lighting housing or HVAC panel |
| Material behavior | Often heated, comparatively high-viscosity prepolymer plus curative | Reactive two-component foam system with defined cream, rise and tack-free times |
| Primary output unit | kg/min, shot mass in kg and shots/hour | g/s or ml/s, bead length/min and parts/hour |
| Critical machine functions | Independent heating, agitation, vacuum degassing, ratio metering and mold filling | Ratio metering, XYZ or robot path control, corner-speed control and bead start/stop control |
| Primary defect modes | Voids, off-ratio cure, hardness drift, incomplete fill and filler settling | Bead necking, oversized corners, start/stop lumps, open joints, poor adhesion and cell collapse |
| Acceptance evidence | Shot-weight data, component-ratio test, temperature trend and cured sample properties | Bead width/height map, path-position check, joint inspection and adhesion/compression test |
| Relevant product page | PU casting machines | FIPFG gasket dispensing machines |
Do not choose between these systems from nominal tank capacity. A 100 L tank does not reveal minimum stable flow, viscosity capability, refill interruption, usable volume or the time needed to heat and degas a fresh batch.
Calculate demand from the heaviest part and shortest available fill window. An illustrative 20 kg casting that must be filled in 120 seconds requires an average mixed flow of 10 kg/min. Add the separately justified allowance for hose volume, recirculation and production scheduling; multiplying output by an unexplained safety factor can oversize the pumps and damage low-flow control.
For FIPFG, calculate bead volume from the approved cross-section and total path length. Then multiply by the cured or dispensed density defined by the material supplier. A supplier should show the calculation that converts g/s into seconds per part and parts per shift.
Technical RFQ Checklist and Acceptance Values
Copy the following table into the RFQ and require every bidder to complete the “offered value” column. Blank cells, “standard” and “as required” should be treated as unanswered items.
| Specification field | Information supplied by buyer | Required supplier response or test |
|---|---|---|
| Component ratio | Nominal ratio, weight/volume basis and adjustment limits | Available ratio range, adjustment method and recorded A/B delivery over at least 10 consecutive shots |
| Viscosity envelope | Minimum and maximum mPa·s for A and B at their operating temperatures | Pump type, speed range, seal material and data showing stable metering at both limits |
| Flow and shot | Minimum flow, maximum flow, smallest shot, largest shot and permitted dispensing time | Continuous-flow range, minimum repeatable shot and gravimetric test results in g or kg |
| Metering tolerance | Buyer-defined ratio and shot-weight tolerance, such as ±1.0% where the formulation requires it | Test method, calibrated scale resolution, individual results, mean and maximum deviation |
| Temperature | Setpoints for tanks, pumps, hoses and head; ambient plant range in °C | Control range, sensor locations, heater power, insulation and temperature trend during a production-length run |
| Degassing | Material moisture sensitivity, batch volume and required preparation time | Vacuum level in kPa absolute or mbar absolute, pump capacity, condenser or trap arrangement and hold test |
| Tank system | Daily consumption in kg, batch size and refill plan | Gross and usable capacity, agitation speed, low-level interlock, refill method and material-contact construction |
| Mixing and cleaning | Dynamic or static preference, available cleaner and disposal restrictions | Head type, mixing speed where applicable, flush consumption per cycle, purge sequence and waste collection method |
| FIPFG motion | Maximum part size, 2D/3D path, tallest obstruction, fixture datum and cycle target | XYZ travel in mm, payload, programmed speed range, repeatability, corner algorithm and file-import format |
| Bead geometry | Nominal width/height and tolerances, such as 8.0 ±0.5 mm wide and 5.0 ±0.3 mm high if validated by the buyer | Measurement map at straights, corners and start/stop joint after the agreed cure time |
| Utilities | Site voltage, phases, frequency, compressed-air pressure, cooling-water temperature and exhaust availability | Connected kW, typical operating kW, A, kVA, L/min of air and water flow/heat-load requirements |
| Controls | Required language, recipe count, plant communications and data-retention period | PLC/HMI manufacturer, alarm history, user levels, recipe fields, export format and remote-support method |
| Changeover | Number of formulations, colors and planned changes per shift | Drainable volume, mixed and unmixed dead volume in ml, cleaning time, changeover waste in kg and required tools |
| Environment | Temperature, humidity, dust zone, hazardous-area classification and local ventilation rules | Permitted operating range, enclosure rating, extraction connection and any installation exclusions |
Ask for both minimum and maximum verified flow. Many production failures occur at the bottom of the operating window: a pump may achieve the headline 20 kg/min yet pulse or lose ratio control during a 100 g detail shot.
Request a component-by-component mass test before mixed-material trials. Collect A and B separately for a controlled interval, weigh them on a calibrated scale and calculate the delivered ratio. Repeat at low, middle and high flow because one test point cannot establish the usable metering envelope.
For filled elastomers, include a shutdown-and-restart trial equal to the longest planned break. Inspect the tank bottom, pump inlet and first casting after restart. This exposes pigment or filler sedimentation that a continuous 10-minute demonstration may hide.
FAT, Safety and Compliance Deliverables
The factory acceptance test should reproduce the hardest production condition, not the easiest demonstration. Use the highest-viscosity material, lowest required flow, longest hose, largest shot and smallest qualified bead where these combinations are technically valid.
Minimum FAT protocol
- Verify calibration status and resolution for scales, temperature instruments, pressure sensors and motion-measurement tools.
- Run a dry interlock test covering low material level, heater over-temperature, loss of air, motor overload, open guard and emergency stop.
- Record at least 10 consecutive component-ratio and shot-weight results at the agreed operating point; retain raw readings rather than reporting only an average.
- Run long enough to include recirculation, dispensing, refill or material replenishment, and a normal operator break.
- Produce agreed samples from buyer tooling or a representative test coupon, then inspect bubbles, fill, hardness or bead dimensions after the specified cure period.
- Document cycle time from part loading through dispensing and unloading. Excluding manual handling can overstate parts per hour.
Polyurethane processing requires controls for isocyanate exposure. OSHA identifies respiratory effects, occupational asthma and skin, eye and mucous-membrane irritation on its isocyanates guidance page. The RFQ should therefore identify closed transfer, extraction connection, splash containment, ventilation responsibility, spill access and the cleaning chemicals used.
For EU industrial and professional use, ECHA states that mixtures containing diisocyanates at or above 0.1% by weight require successful safe-use training unless another restriction condition applies. Confirm the current obligation with the material supplier and the official ECHA notice on diisocyanates.
For machinery safety, require the supplier to document hazards across installation, operation, cleaning, blockage removal and maintenance. ISO 12100:2010 provides the risk-assessment and risk-reduction methodology; citing it in a brochure is not a substitute for a machine-specific risk assessment.
State the destination country before quotation. Request the exact conformity package needed there: declaration, risk assessment, electrical drawings, pneumatic and hydraulic diagrams, guarding description, safety-function validation, manuals and labels in the required language. Do not accept “CE certified” as the full response; ask which directives or regulations and harmonized standards were applied to the supplied configuration.
Commercial Terms for a Manufacturer-Direct Purchase
A machine price has little meaning until the supply boundary is fixed. The quotation should separate the base metering unit, tanks, vacuum system, heated hoses, casting head or XYZ platform, fixtures, oven, material loading, extraction, spare parts, packing, freight, installation and taxes.
Ask the manufacturer to return a signed compliance matrix with “complies,” “deviation” or “optional price” against every RFQ line. This exposes hidden exclusions before purchase order placement and lets procurement compare bids on one technical basis.
Direct engineering access matters when pump sizing, hose heating, fixture datums and recipe logic must be changed for the buyer’s material. Require a named mechanical engineer, controls engineer and commissioning contact, plus response times for remote diagnosis and on-site support.
Do not request a generic MOQ for capital equipment. Ask how many machines are included, which customization charges are one-time engineering costs, whether tooling has a separate MOQ and which consumables must be bought in batches. Obtain the production lead time in calendar days from drawing approval and deposit, followed by FAT correction time, packing time and shipping readiness.
Define warranty by covered assemblies and start date. Clarify whether the period begins at bill of lading, arrival, commissioning or final acceptance; who pays international freight for failed components; and whether travel, labor, pumps, seals, heaters and mixing-head wear parts are included or excluded.
The spare-parts package should be based on failure consequence. Request one commissioning set, one two-year operating set and a priced critical-spares list with manufacturer part numbers. Include pump seals, filters, O-rings, thermocouples, heater elements, cleaning seals, static mixers or dynamic-head wear items, plus PLC and drive backup files.
Release final payment only against defined evidence: passed FAT report, corrected punch list, manuals, drawings, software backups, spare-parts list, packing photographs and shipment documents. If site acceptance is required, specify the number of production hours, raw material provider, acceptable downtime, output and sample-quality limits.
FAQ
Q: How do I choose a polyurethane casting machine for several part sizes?
Specify the smallest shot, largest shot, lowest acceptable flow, maximum mixed flow and fill time for each part. The supplier must demonstrate that one pump and mixing-head configuration holds the required ratio across that envelope; maximum kg/min alone does not establish suitability.
Q: What is the most commonly missed item in a FIPFG machine specification checklist?
The approved cured bead geometry is often missing. Provide width, height and tolerances in mm, the path drawing, corner radii, start/stop location, substrate, cure time and compression condition so the FAT can measure an actual sealing result.
Q: Should metering accuracy be specified as ±1%?
Use the tolerance required by the formulation and finished-part validation. If ±1.0% is selected, define whether it applies to component mass, ratio error or total shot weight, at which flow rates, across how many shots and with what scale resolution.
Q: Is tank capacity enough to estimate production output?
No. Output also depends on usable tank volume, heating and degassing time, minimum and maximum pump flow, shot time, mold handling, cure schedule and refill interruptions. Convert every product family into kg/shift or bead length/shift before sizing tanks.
Q: What samples should be sent to a machine manufacturer?
Send current A- and B-component data sheets, safe-handling documents, 2D/3D part files, substrate coupons, an approved finished sample and enough production material for FAT. Confirm shipment temperature and hazardous-goods requirements with the chemical supplier.
Q: Which certificates should be requested?
Start with the legal requirements of the installation country and the buyer’s plant rules. Request a configuration-specific declaration, applied standards list, ISO 12100 risk assessment, electrical documentation and safety validation; do not assume that an unrelated company certificate proves machine conformity.
Q: How can quotations from different manufacturers be compared fairly?
Issue one numbered compliance matrix and require offered values, exclusions, FAT methods, lead time in calendar days, warranty start point and separately priced options. Reject unquantified terms such as “precise control” unless the bidder supplies a tolerance and verification method.