indianceramica@gmail.com - GST NO. : 23ASHPA0569P1ZM
- Send Email
Posted by Admin on July, 26, 2026
What Is the Best Feldspar for Vitrified Tiles?
The 5 specification priorities for vitrified tile feldspar:
- Higher flux content than wall tile grades — K₂O/Na₂O 11.5%+ to achieve the full vitrification vitrified tile bodies require.
- Consistent 200/325 mesh grading — for uniform, complete melt supporting the tight dimensional tolerance vitrified tile production demands.
- Fe₂O₃ below 0.08-0.15% — sufficient whiteness for polished GVT surfaces, tighter for premium export lines.
- Low, stable LOI — minimizes gas-release defects (pinholing, bloating) that show more visibly on polished vitrified surfaces.
- NABL COA verified per shipment — the dimensional tolerance vitrified tile demands leaves little room for undetected batch drift.
Source: Aalok Overseas Technical Laboratory, Rajasthan, India · Manufacturer & Exporter of Feldspar to 50+ Countries Since 1992 · www.feldsparindia.com
Home Potash Feldspar Sodium Feldspar Quartz Powder Contact Us
Home › Blog › Best Feldspar for Vitrified Tiles
AALOK OVERSEAS INDIA · APPLICATION GUIDE #21
GVT & Full-Body Vitrified Tile · Flux Ratio · Mesh Grading · NABL COA · Exporter Since 1992
REQUEST VITRIFIED TILE GRADE SAMPLE → VIEW SPECIFICATIONSWhy Vitrified Tiles Need a Different Feldspar Spec Than Wall Tile
Vitrified tiles — including GVT (Glazed Vitrified Tile) and full-body vitrified tile — are fired to achieve near-zero water absorption through near-complete vitrification of the body. This requires a higher proportion of feldspar flux than standard wall tile bodies, and much tighter consistency in that flux content, mesh grading, and iron level, since vitrified tile's tight dimensional and surface-quality tolerances leave far less room for raw material variability than a standard wall tile line.
Feldspar Requirements by Vitrified Tile Type
| TILE TYPE | K₂O / NA₂O TARGET | FE₂O₃ TARGET | MESH |
|---|---|---|---|
| Full-Body Vitrified Tile | K₂O 11.5-12.5% | <0.15% | 200/325M |
| Polished GVT | K₂O 11.5-13% or Na₂O 10-11% | <0.08% | 325M |
| Export Vitrified Tile | K₂O 11.5-12.5% | <0.06-0.10% | 325M |
What to Verify Before Buying Feldspar for Vitrified Tile
PRIORITY 01
Flux Content Consistency
K₂O or Na₂O held within a tight ±0.3% band lot to lot — the single largest factor in holding vitrified tile's dimensional tolerance.
PRIORITY 02
Mesh Grading for Complete Melt
200/325 mesh with verified sieve analysis, ensuring uniform, complete melt within the vitrified firing cycle without unmelted grains.
PRIORITY 03
Fe₂O₃ Matched to Surface Requirement
Standard vitrified tile can use Fe₂O₃ up to 0.15%; polished GVT needs 0.08% or lower to avoid visible tinting on the polished surface.
PRIORITY 04
Low, Stable LOI
Below 0.4-0.6% to minimize pinholing and gas-release defects, which show up more visibly on a polished vitrified surface than a matte wall tile.
PRIORITY 05
Per-Shipment NABL COA
Given vitrified tile's tight tolerances, a one-time sample is not sufficient — every shipment needs verified chemistry, LOI, and mesh data.
The Aalok Overseas Advantage for Vitrified Tile Manufacturers
Vitrified-Grade Potash & Soda Feldspar
K₂O 11.5-13% and Na₂O 9.5-11% grades specifically suited to vitrified tile's higher flux requirement, mesh-graded 200/325.
NABL COA on Every Shipment
Flux content, Fe₂O₃, LOI, and sieve analysis verified per lot — the consistency vitrified tile's tight tolerance demands.
High Whiteness Grades for Polished GVT
Fe₂O₃ as low as <0.06-0.08% available for polished vitrified tile lines where surface whiteness is a quality-inspection criterion.
Full Complementary Range
Quartz powder and kaolin also available from the same Rajasthan operations, letting vitrified tile manufacturers consolidate their entire body formulation sourcing.
Why Manufacturers Choose Aalok Overseas
Since 1992, Aalok Overseas has supplied mine-direct, NABL-certified feldspar to vitrified tile manufacturers across 50+ countries. Vitrified tile's tolerance for raw material inconsistency is the tightest in ceramic manufacturing — Aalok Overseas' mine-direct control is what makes that tolerance achievable, shipment after shipment.
FAQ — Feldspar for Vitrified Tiles
Q
What K2O or Na2O content is best for vitrified tile feldspar?
K₂O 11.5-13% for potash feldspar or Na₂O 9.5-11% for soda feldspar is typical for vitrified tile, higher than standard wall tile grades, to achieve the near-zero porosity vitrification requires.
Q
Why does polished GVT need lower Fe2O3 than standard vitrified tile?
Polishing exposes and highlights any tint in the body, making iron-related colour variation far more visible than on a matte or textured surface, so polished GVT lines typically specify Fe₂O₃ below 0.08%.
Q
Which mesh size is best for vitrified tile feldspar?
325 mesh is generally preferred for vitrified tile to ensure complete, uniform melt within the firing cycle, though 200 mesh can be adequate for some full-body vitrified formulations.
Q
Why is per-shipment COA more important for vitrified tile than wall tile?
Vitrified tile's dimensional and surface-quality tolerances are significantly tighter than standard wall tile, meaning even minor batch-to-batch feldspar variation that wall tile could absorb can push vitrified tile out of spec.
Q
Can the same feldspar grade work for both potash and soda-based vitrified tile recipes?
No. Potash and soda feldspar have different melt viscosity and vitrification behaviour, so a recipe designed around one type generally needs reformulation, not just substitution, when switching to the other.
Related Guides
REQUEST VITRIFIED TILE GRADE SAMPLE · NABL COA · FULL CHEMISTRY DATA
Contact Aalok Overseas — India's Vitrified Tile Feldspar Specialist
Request free samples of vitrified-grade potash or soda feldspar with NABL-certified COA and MSDS. Mine-direct sourced from Rajasthan since 1992, exported to 50+ countries.
Potassium Feldspar · Sodium Feldspar · Quartz Powder · Kaolin · All Products · Blog
NABL COA · FOB Mundra / Kandla · 50+ Countries · © 2026 Aalok Overseas
Search
Recent Posts
Leave a Comment