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EXECUTIVE QUICK ANSWER & METALLURGICAL OVERVIEW

Lost Wax Investment Casting (Silica Sol vs Water Glass): Surface Roughness Ra & Precision Tolerances

1 min read Processes PRC-003

Prerequisite: Foundry Molding Processes Handbook: Sand Casting vs Investment vs Shell vs Lost Foam

EXECUTIVE QUICK ANSWER & METALLURGICAL OVERVIEW

  1. TECHNICAL FUNDAMENTALS & ENGINEERING SPECIFICATION MATRIX The operational capacity and fatigue life of components inside the Foundry Molding Processes category depend upon strict adherence to international material and dimensional standards (ISO, EN, DIN, ASTM). Below is the master specification matrix.

  2. GLOBAL SOURCING ECONOMICS & INDIAN FACTUAL BENCHMARKS (AQUASUB / TEXMO) Reference: High-precision silica sol investment casting foundries in Rajkot and Coimbatore producing CF8M stainless valve components for European export. When evaluating international sourcing options for Foundry Molding Processes, European procurement directors can reference established Indian manufacturing leaders in the Coimbatore Corridor (Aquasub Engineering / Aquagroup and Texmo Industries). Operating captive automated green sand molding loops (DISAMATIC 2110) coupled with multi-axis CNC horizontal machining and 100% automated pressure testing, these groups prove definitively that Indian foundries routinely deliver European zero-defect (PPM < 10) standards at a 30%+ net landed DDP savings (PIL-008 / PRO-004).

[EXECUTIVE QUICK ANSWER: FOUNDRY MOLDING PROCESSES] Lost-Wax Investment Casting creates precision near-net-shape metal components by dipping injection-molded wax patterns into ceramic slurries. Silica Sol investment casting utilizes fine zircon refractory sand fired at 1,000°C, achieving ultra-tight ISO 8062 CT5 to CT6 tolerances, thin wall capabilities (1.5 mm), and mirror-like surface roughness ($R_a ext{ }1.6 ext{--}3.2 ext{ }\mu ext{m}$), completely eliminating secondary CNC milling on complex stainless steel valve balls (MAT-054).

Investment Slurry Technology Achievable Tolerance Band (ISO 8062) Surface Roughness ($R_a$) Primary Material & Application Focus
Silica Sol (Zircon Slurry — High Grade) CT5 to CT6 (±0.15mm on 50mm span) Ra 1.6 µm to 3.2 µm Stainless steels (316L/Duplex), aerospace brackets, precision API 6D valve balls and impellers.
Sodium Silicate (Water Glass — Utility Grade) CT7 to CT8 (±0.40mm on 50mm span) Ra 6.3 µm to 12.5 µm Carbon steels (GS-C25), standard agricultural hardware, pipe fittings where CT5 is not mechanically required.

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