Core Sand Mixture: Permeability 80-200

Component Specifications

Definition

Core sand mixture is a precisely formulated blend of base sand, binders, and additives designed to create expendable cores for metal casting. These cores form internal passages, cavities, and complex geometries within cast components, maintaining dimensional stability under high temperatures while being easily removable after solidification. The mixture must balance green strength, dry strength, collapsibility, and thermal stability to ensure defect-free castings.

Working Principle

Core sand mixtures work by combining refractory base materials with organic or inorganic binders that harden through chemical reaction, thermal curing, or air drying. When compacted into core boxes, the mixture forms rigid shapes that withstand molten metal pressure and temperature. After casting, the binder breaks down through thermal decomposition or mechanical action, allowing easy core removal from the solidified metal part.

Materials

Silica sand (AFS 50-120), chromite sand, zircon sand, or olivine sand blended with binders (phenolic resins, furan resins, sodium silicate, or inorganic binders) and additives (cereal binders, iron oxide, coal dust, or release agents).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Permeability	80-200
Loss On Ignition	1.5-4.0%
Moisture Content	1.5-3.5%
AFS Grain Fineness	50-120
Dry Compression Strength	150-400 psi
Green Compression Strength	10-30 psi

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 13517, DIN 51900

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

Respirable silica dust exposure
Volatile organic compound emissions
Thermal degradation byproducts
Inconsistent mixture quality
Moisture absorption during storage

FMEA Triads

Trigger: Incorrect binder-to-sand ratio
Failure: Poor core strength leading to core wash or metal penetration
Mitigation: Implement automated weighing systems with regular calibration and batch testing

Trigger: Inadequate mixing time or intensity
Failure: Uneven binder distribution causing weak spots and core breakage
Mitigation: Use controlled mixing equipment with timers and power monitoring, conduct periodic sieve analysis

Trigger: Improper storage conditions (temperature, humidity)
Failure: Reduced bench life and inconsistent properties
Mitigation: Store materials in controlled environments, use first-in-first-out inventory, monitor storage conditions

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±2% on binder content, ±5% on additive percentages, AFS grain fineness within specified range

Test Method

ISO 13517 for foundry sands, AFS standard testing procedures for sand properties, manufacturer specifications for binder systems

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Core Sand Mixture

Manufacturer profiles associated with Core Sand Mixture.

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Frequently Asked Questions

What is the difference between core sand and molding sand?

Core sand mixtures are specifically formulated for creating internal cores with higher strength and better collapsibility, while molding sand is used for the main mold cavity and typically has different binder systems and properties.

How long does core sand mixture remain usable after mixing?

Working time varies by binder system: phenolic resin systems typically have 2-4 hours bench life, while inorganic binders may have 8-24 hours depending on humidity and temperature conditions.

What causes core sand mixture to produce casting defects?

Common defects include gas porosity (from excessive binder), veining (from thermal expansion mismatch), and poor collapsibility (from incorrect binder ratios or additives).

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 Sand Mixture