Smooth casting surface, complete mold protection, and minimization of finishing costs.
Protective coatings (mold washes) are specialized, liquid or dry preparations applied to foundry molds, cores, and metal dies. Their task is to create a durable, highly refractory release and protective coating that safeguards the molding sand or metal mold against the destructive, thermal, and chemical action of the molten metal.
How do protective coatings work in the casting process?
A mixture of appropriately selected refractory raw materials (carbonaceous materials, aluminosilicates, graphites, zircon) and binders ensures coating stability and excellent adhesion:
- Protection against infiltration: Once applied, the coating creates a physical and thermal barrier, preventing the molten metal from penetrating the pores of the mold or core.
- Wash resistance: Special stabilizing additives prevent erosion caused by the impingement of the molten metal stream.
- Release layer: Protects permanent molds, safeguarding against sudden thermal shock and facilitating the separation of molding sands from the pattern equipment.
Key product groups in the PEDMO offer
We offer comprehensive solutions tailored to every molding and casting technology:
- Mold release agents:
- Foundry Powder P (hydrophobic release agent with silica).
- Foundry Powder SG (with highly refractory material).
- Spefat 6041 (release agent with aluminum pigment for cold-setting processes, e.g., furan, alpha set).
- Water/oil colloidal graphite (20%) – excellent lubricating properties for dies in forgings and hot stamping.
- Protective coatings:
- Separal 1 – protective suspension for permanent molds used with copper and aluminum alloys.
- Separal 10 – for release coatings poured with cast iron.
- Separal 3 MPL – special lubricating gel (e.g., for pilger mandrels, temp. up to 400°C).
- Blacking CzIIp/Pkn-51/895 – dry compositions with an organic binder. Protection of molds poured with cast iron, copper, and aluminum.
- Żeliod P/Z var. A – an excellent, dry thixotropic-based composition for protecting molds for heavy iron castings.
- Kokilokryt G – 24-hour coating regulating the solidification rate in aluminum permanent molds.
- Kokilokryt Nw – paste securing the part of the die recreating the feeder (delays solidification).
- Kokilokryt Pw – an excellent base coating with high adhesion.
- Specotin 3532 – ready-to-use, highly smooth alcohol-based coating based on graphite for gray cast iron.
Key benefits for foundries
- Drastic cut in finishing costs – a smooth casting surface after knock-out means a significant reduction in grinding and shot blasting time.
- Complete elimination of burn-on – the coating effectively isolates steel, cast iron, or non-ferrous metal alloys from the sand structure.
- Excellent adhesion and ease of application – the ability to adjust density for application by brush, spraying, or dipping.
- Extension of tooling life – protection of cores, dies, and matrices against thermal erosion and damage.