Spray can temporarily assist release, but continuous heavy sticking usually indicates a tooling or process problem. Causes include inadequate draft, undercut features, poor cooling, over-packing, damaged mould surfaces, vacuum locks or insufficient ejection force. Spray should not replace proper mould maintenance and process correction.
Only if the exact spray has been certified for food-contact applications (e.g. NSF H1 or equivalent). Standard industrial sprays contain solvents, propellants and oils that may contaminate food packaging or medical products. Verify the certification and regulatory approval before using any spray on food-grade tooling.
Provide the moulded material type, mould operating temperature, post-moulding requirements (such as painting, printing or bonding), food or medical compliance needs, specific sticking problem and order quantity. This ensures the correct silicone, paintable or specialised formulation is offered.
The mould surface should be clean and dry. Hold the aerosol can upright, at the distance recommended by the manufacturer (often 20 cm to 30 cm), and apply a light, even mist across the target area. Avoid excessive spraying, pooling or spraying too close, which wastes product and affects part finish.
The frequency depends on the spray formulation, mould material, part geometry and resin type. A good silicone spray may last for several cycles before reapplication is necessary. Paintable or specialised sprays may need more frequent application. Spray only when release resistance increases.
Excess spray can accumulate in corners, block fine air vents, create weld lines, alter part dimensions or cause surface smudges on the moulded component. Propellant and solvent pooling can also create a fire hazard near hot mould parts. Always apply a thin, controlled film.
Yes. Repeated application of some release agents can leave a residue that degrades, hardens or attracts polymer dust. This build-up eventually causes parts to stick, dulls surface finishes and blocks vents. The mould must be cleaned periodically with a suitable mould cleaner or solvent to remove old spray residue.
It is removed using an industrial mould cleaner, degreaser or appropriate solvent. The cleaner breaks down the release film and any polymer residue, leaving the steel surface bare. Spraying a new film over an uncleaned, contaminated mould will not solve underlying sticking problems.
Aerosol sprays contain propellants and solvents that may be flammable, toxic or an inhalation risk. They must be used in a well-ventilated area, kept away from open flames and stored correctly. Operators must follow the safety data sheet (SDS) instructions and wear appropriate personal protective equipment.
If a silicone-based spray is used, the silicone film transfers to the moulded part. Paint will not adhere to this film, causing fisheyes or peeling. Parts must be thoroughly degreased and cleaned if silicone was used. A non-silicone or paintable spray should be selected to avoid this problem.
White marks or a cloudy finish can result from applying too much spray, spraying too closely, propellant evaporation chilling the mould surface, or using an incompatible release formulation for the resin. The mould surface may also need cleaning to remove accumulated residue.
If the mould temperature is higher than the spray’s operating limit, the active ingredients may flash off or fail to form a film. Alternatively, the mould may be contaminated with incompatible oil or rust preventative. Verify the temperature rating and clean the mould thoroughly before application.
Yes. Textured or etched surfaces can hold onto the plastic as it shrinks, making release difficult. A light application of spray helps demoulding. However, heavy application will fill the texture valleys and reduce the matte finish effect on the moulded part.
If your plant safety system or quality control requires a Technical Data Sheet (TDS) or Safety Data Sheet (SDS) defining the chemical composition, operating limits and hazard warnings, please request these documents when placing your enquiry.
The problem may be an undercut, a rough surface finish, a vacuum lock, inadequate draft angles, or excessive injection packing pressure. The mould temperature may also be incorrect for the resin. Spray reduces friction; it cannot fix a physical obstruction or an incorrect moulding parameter.
No. Mould release spray is designed to create a thin parting film on the cavity surface. It does not possess the extreme-pressure lubricating properties required to prevent metal-to-metal galling or seizing between ejector pins and mould plates. A dedicated high-temperature ejector pin grease should be used.
When taking a mould out of service, ensure the tool is completely dry and at room temperature. Spray an even coating over all exposed metal surfaces, focusing on the core, cavity and guide components. The protective film must be cleaned off or purged through initial moulding cycles before returning the tool to production.
If the mould is run without cleaning, the anti-rust film will contaminate the first batch of moulded parts, causing surface defects, flow marks or poor weld strength. Depending on the product, it may take several cycles to clear the residue completely from the mould surface.
While high-quality sprays are designed to evaporate cleanly and leave only the required active film, excessive application, burning due to high temperatures, or chemical incompatibility with the resin can create a dark or sticky residue. Regular mould cleaning is recommended.
No. Mould release spray and anti-rust spray add a film to the surface. A separate mould cleaner or degreasing spray contains specific solvents designed to break down and wash away old lubricants, polymer residue and release agents. Use the correct product for each maintenance task.
Store aerosol cans in a cool, dry, well-ventilated area away from direct sunlight, open flames, heaters and electrical sparks. Do not store cans on top of hot moulding machines or in areas where temperatures exceed the safety limit printed on the can (typically 50°C).
Yes. If an aerosol can is too cold, the internal pressure drops, resulting in a weak spray pattern or sputtering. This can cause large droplets or an uneven release film on the mould. Store cans at normal room temperature before use.
Nozzles can clog if the active ingredients dry inside the tip after use. Some manufacturers recommend clearing the nozzle by inverting the can and spraying a short burst until only clear propellant escapes. If clogged, remove the nozzle and clean it with an appropriate solvent; do not puncture the can.
The environmental impact depends on the specific propellants and solvents used in the formulation. Many modern sprays are formulated without CFCs or ozone-depleting substances. Buyers should review the safety data sheet to ensure the product meets local environmental and workplace regulations.
Vardhman Dies & Mould Tools acts as a supplier and distributor for these chemical products alongside their precision mould accessories. We supply proven industrial formulations suited for plastic injection and tooling applications. Confirm the exact brand or product specification if required.
