Core Coating: pH Range 7-10, Coating Thickness 0.1-0.5 mm

Component Specifications

Definition

Core coating is a refractory material applied to the surface of foundry cores used in metal casting processes. It serves as a barrier between the molten metal and the core sand, preventing metal penetration into the core, facilitating core removal after casting, and improving the surface quality of the final casting. The coating is typically applied as a slurry or spray and then dried or cured before the casting process.

Working Principle

The coating creates a thermally stable, non-wettable barrier on the core surface. During metal pouring, it prevents molten metal from penetrating into the core sand pores, reduces gas evolution from the core, and provides a smooth interface that allows for clean core removal after solidification. The coating's refractory properties withstand high temperatures while maintaining integrity.

Materials

Refractory materials including zircon, silica, alumina, graphite, or proprietary ceramic blends suspended in water-based or alcohol-based carriers with binders and additives.

Technical Parameters

Parameter	Typical range	Notes & selection driver
PH Range	7-10
Refractoriness	>1600°C
Specific Gravity	1.8-2.2 g/cm³
Coating Thickness	0.1-0.5 mm
Application Method	Spray, dip, or brush
Drying Temperature	150-250°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 945, DIN 1691

Parent Products

This component is used in the following industrial products

Casting Core

A casting core is a preformed, expendable component placed in a mold cavity to create internal passages, voids, or complex geometries in metal castings.

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Engineering Analysis

Risks & Mitigation

Inadequate coating thickness leading to metal penetration
Improper drying causing gas defects
Coating contamination affecting casting quality
Environmental hazards from coating materials

FMEA Triads

Trigger: Insufficient coating thickness
Failure: Metal penetration into core, rough casting surface
Mitigation: Implement thickness measurement controls, optimize application parameters

Trigger: Improper drying/curing
Failure: Gas evolution during pouring, coating peeling
Mitigation: Establish proper drying cycles, monitor temperature and humidity

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Coating thickness tolerance ±0.05 mm, drying temperature ±10°C

Test Method

Visual inspection, thickness measurement, adhesion test, refractoriness test per ISO standards

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Core Coating

Manufacturer profiles associated with Core Coating.

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Frequently Asked Questions

What is the primary purpose of core coating in casting?

The primary purposes are to prevent molten metal penetration into the core, facilitate core removal after casting, and improve the surface finish of the final casting.

How is core coating typically applied?

Core coating is typically applied using spray, dipping, or brushing methods, followed by drying at controlled temperatures to achieve proper adhesion and performance.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Core Coating