Particle
Identify material, shape, largest normal size, concentration and whether solids settle or agglomerate.
Wear and compatibility
How should abrasive pastes be specified for filling?
Treat abrasive paste as a wear and compatibility application, not only a viscosity problem. Document the particle type, size, concentration, hardness, settling, carrier chemistry, temperature, batch length and cleaning method, then inspect the full product path during a representative trial.
Direct answer
Abrasive wear is created by the product, velocity, pressure, clearances, material pair and number of cycles together.
Two pastes with similar apparent viscosity can create very different wear. A soft food inclusion, a hard mineral filler and a pigment-rich industrial compound should not be grouped only as “products with particles”. The quotation should identify where the product slides, squeezes, changes direction or passes a close clearance.
Carrier
Record oils, water, solvents, resins, pH, temperature and cleaning chemistry that affect seals and surfaces.
Duty
State batch size, cycles, line speed, pauses, overnight hold and expected service interval.
Evidence
Inspect dose stability, product condition, leakage, scoring, seal debris and cleanability after a representative run.
Wear map
Map every restriction and moving interface in the product path.
| Product-path area | What can go wrong | Evidence to request |
|---|---|---|
| Feed and suction | Settling, bridging, starvation or high suction demand can create inconsistent refill and local wear. | Product level, agitation, feed pressure, refill time and condition after pauses. |
| Cylinder and piston seal | Particles can score surfaces, enter seal interfaces or accelerate leakage and dose drift. | Material schedule, seal design, inspection interval and post-trial condition. |
| Pump internals | Close clearances, lobes, rotors, stators or gears may experience abrasion depending on product and speed. | Supplier review of the actual formulation and inspection after representative duty. |
| Valves and seats | Particles can trap at closure, damage seats or prevent a repeatable seal. | Largest particle, valve opening, closure test and leakage observation. |
| Hoses and bends | High velocity and repeated direction changes can concentrate wear and increase hold-up. | Hose material, bore, bend layout, pressure and replacement criteria. |
| Nozzle shut-off | Abrasive particles can damage close-tolerance mechanisms or leave a contaminated cut-off. | Nozzle design, bore, shut-off sequence, drip observation and inspection access. |
Technology comparison
Do not select piston, rotor-lobe or progressive-cavity filling from the pump name alone.
Each positive-displacement route can have advantages and limitations, but abrasion depends on the specific product and machine construction. The comparison should state what must be proved rather than assigning a universal winner.
| Method | Potential reason to consider it | What must be proved |
|---|---|---|
| Piston dosing | Defined chamber volume and direct volumetric cycles can suit batch and automatic formats. | Chamber refill, particle passage, cylinder and seal wear, valve closure and cleaning access. |
| Rotor-lobe dosing | Continuous positive-displacement pumping can support controlled transfer and filling. | Clearance wear, particle damage, speed, pressure, product recovery and cleaning of the pump path. |
| Progressive-cavity dosing | Controlled displacement can be useful for selected viscous or difficult products. | Rotor/stator compatibility, solids behaviour, dry-running protection, cleaning and replacement duty. |
| Gravimetric or alternative route | May be relevant for large packs or where net mass is the primary process variable. | Product feed, cut-off, scale stability, pack handling, legal-metrology needs and accepted output. |
Compatibility and safety information
Use the product information to define the assessment, not to replace it.
For hazardous industrial products, obtain the current safety data sheet and product composition information available from the supplier. HSE guidance explains that a safety data sheet supports but does not replace a COSHH risk assessment. The machine review still needs the actual transfer, filling, cleaning, maintenance and foreseeable exposure conditions.
Review the wetted-parts and seal guide alongside the HSE COSHH safety-data guidance.
Information for Lancing
Send more than the word “abrasive”.
- Product and carrier composition available for engineering review.
- Particle material, size distribution, shape and concentration.
- Normal and maximum temperature and any curing or drying behaviour.
- Batch size, daily cycles, pauses and cleaning frequency.
- Container opening, target dose and accepted presentation.
- Current wear problem, service life or contamination concern.
Representative trial
A short demonstration may prove filling, but not service life.
A product trial should confirm feed, dose, cut-off, product condition and cleanability. Wear evidence normally needs an agreed duty or inspection plan because some damage develops over many cycles. Where long-duration proof is not practical before order, define inspection points, replaceable parts, initial spares and acceptance boundaries explicitly.
- Prime with representative product and record the quantity needed to fill the product path.
- Run the hardest normal condition, including settling time, temperature and particle distribution.
- Measure sequential packs and observe refill, leakage, pressure and nozzle cut-off.
- Inspect accessible wear points after the run for scoring, debris, seal damage or trapped particles.
- Clean and reassemble using the proposed site method and inspect hidden hold-up areas.
- Agree the maintenance baseline covering inspection, replacement criteria and critical spares.
Use the product sample test guide, spares guide and positive-displacement comparison to complete the review.
Buyer questions
Common questions about abrasive paste filling.
Does stainless steel make a filler abrasion-proof?
No. Stainless grade and finish may be important for compatibility and cleanability, but abrasion also depends on particle hardness, velocity, pressure, clearances and component geometry. Review every product-contact material and wear interface.
How can particle passage through valves and nozzles be checked?
Compare the largest normal particle or agglomerate with every restriction, then prove the actual product under normal mixing and settling conditions. A nominal bore alone does not confirm reliable closure, cut-off or product quality.
Will a short filling test prove component life?
Usually not. A short trial can expose immediate blockage, leakage or scoring, but long-term wear depends on cycle count and duty. Agree what can be inspected during the trial and what will be monitored in production.
Which spares should be considered for an abrasive product?
Start with the identified wear path: seals, valve seats, hoses, nozzle components and pump or cylinder parts. The final list should follow the quoted machine, product evidence, inspection method and planned service interval.
Need an abrasive product path reviewed?
Send the product description, available safety information, particle data, dose, pack, batch duty and current wear concern. Lancing can define the evidence needed before equipment is shortlisted.