IS 15622 Tile Standard Explained for Indian Buyers (2026) — What India's core ceramic and vitrified tile standard actually specifies — and how to read it off the box and spec sheet before you buy.

Indian tile spec sheet and box markings showing IS 15622 water absorption group, ISI mark and dimensions

Almost every ceramic and vitrified floor tile sold in India is governed by a single standard: IS 15622. It is the rulebook that decides whether the tile in your trolley is a true porcelain fit for a busy hall, or a soft wall tile that will stain and crack on the floor. The good news is that you do not need a lab to read it — most of what matters is printed on the box, and one number on that box tells you almost everything.

This guide decodes IS 15622 for buyers, not engineers. We cover what the standard specifies — dimensions and calibre tolerances, the water-absorption groups BIa to BIII, breaking strength, surface abrasion, slip, chemical and stain resistance, and crazing — how it maps to the international ISO 13006 system, why the water-absorption GROUP is the single most useful spec, how to read a tile spec sheet, and why the ISI (BIS) mark is now legally mandatory.

What IS 15622 actually is

IS 15622 is the Bureau of Indian Standards specification titled "Pressed Ceramic Tiles — Specification". It covers dry-pressed ceramic and vitrified tiles for floors and walls — which is the overwhelming majority of tiles you buy in India, from a glossy bathroom wall tile to a double-charged vitrified slab in a showroom.

Crucially, IS 15622 is harmonised with the international standard ISO 13006 ("Ceramic tiles — Definitions, classification, characteristics and marking"). That is why an imported Italian or Spanish tile and a Morbi-made tile can both be described in the same language. The classification, the absorption groups, the test thresholds — they line up. So when this guide talks about "Group BIa", that label means the same thing whether the tile came from Morbi, Gujarat or Sassuolo, Italy.

IS 15622 does not, by itself, tell you HOW to test a tile. The test procedures live in a companion standard, IS 13630 ("Methods of Test for Ceramic Tiles"), which mirrors the ISO 10545 test series — water absorption, breaking strength, abrasion, slip, chemical resistance and crazing are all measured by IS 13630 methods, then judged against the limits in IS 15622. For deeper coverage of those laboratory methods, see our companion on tile testing and quality in India.

How tiles are classified: pressed group "B"

ISO 13006 and IS 15622 first split tiles by how they are SHAPED. Dry-pressed tiles (made by pressing powder in a die — almost all modern tiles) are Group B. Extruded tiles are Group A. Since you are buying pressed tiles, you only ever deal with the B family.

Within Group B, tiles are then graded by water absorption — how much water the fired clay body soaks up by weight. This is the spine of the whole standard. Lower absorption means a denser, harder-fired body that is stronger, more frost- and stain-resistant, and better for floors. The groups run from BIa (densest) down to BIII (most porous).

IS 15622 / ISO group	Water absorption (E, % by mass)	What it really is	Best use in an Indian home
BIa	E less than or equal to 0.5	Fully vitrified / porcelain — densest	Heavy-traffic floors, halls, commercial, frost-prone hill stations
BIb	0.5 to 3	Vitrified (semi-porcelain)	General home floors, living, bedrooms
BIIa	3 to 6	Stoneware ceramic	Light-traffic floors, light areas
BIIb	6 to 10	Ceramic	Walls; floors only in very light use
BIII	greater than 10	Earthenware (porous)	Wall tiles ONLY — never floors

A simple rule: for a floor in a normal Indian home, you want BIa or BIb. BIII is a wall tile and must never go on a floor, no matter how good the deal looks. Because this number does so much work, we treat it in depth in our dedicated guide to tile water absorption groups in India, and you can match a group to your room with the tile water absorption classifier tool.

The water-absorption ladder

The diagram below shows how the groups stack — denser and floor-worthier at the top, more porous and wall-only at the bottom.

The other specs IS 15622 controls

Water absorption is the headline, but IS 15622 sets pass/fail limits on a whole suite of properties. Here is what each one means for you as a buyer.

Property (IS 15622)	What it measures	Why it matters to a buyer
Dimensions and calibre	Length, width, thickness and how far each tile may vary from nominal size	Tight tolerance means even joints; wide variation causes lippage and ugly grout lines
Surface flatness, edge straightness, rectangularity	Warping, bowing, out-of-square	Bowed or out-of-square tiles never lay flat — sight along a tile before buying
Water absorption	Body porosity (the group)	Decides floor vs wall, stain and frost resistance — the master spec
Breaking strength / modulus of rupture	Force the tile withstands before fracture	Higher = survives furniture, foot traffic, point loads; floors need higher values
Surface abrasion (PEI for glazed)	How well the glaze resists wear	PEI III+ for home floors; full-body vitrified is rated by volume loss, not PEI
Slip resistance	Anti-slip rating (ramp / pendulum)	Critical for bathrooms, balconies, entries, pool decks and accessible homes
Chemical and stain resistance	Resistance to household chemicals and staining	Kitchens, bathrooms, anything exposed to acids, oils, dyes
Crazing resistance	Resistance to fine glaze cracks over time	Crazing ruins glazed tiles cosmetically; the test checks the glaze-body bond
Linear thermal expansion / thermal shock	Movement and survival under heat changes	Terraces, sun-facing floors, anywhere with big temperature swings

Calibre and dimensional tolerance

"Calibre" is trade shorthand for the actual fired size of a production batch — a 600 by 600 mm tile might run at 599 or 601 mm. IS 15622 allows small tolerances, and good factories print a calibre number on the box so you only mix matching batches. Mixing calibres is the number-one cause of lippage (one tile edge sitting proud of its neighbour). Always buy a single calibre for one room.

Breaking strength and abrasion

Breaking strength (modulus of rupture) is why a vitrified floor tile feels so much tougher than a thin wall tile. IS 15622 demands higher breaking strength from low-absorption groups, which is another reason BIa/BIb belong on floors. For glazed tiles, surface wear is graded by the PEI rating (Classes 0 to V). For homes, choose PEI III or higher; for shops and offices, PEI IV to V. Full-body and double-charged vitrified tiles are judged by abrasion volume loss instead. See our dedicated guide to the PEI rating for tiles in India.

Slip, chemical, stain and crazing

Slip resistance is judged by ramp-test ratings (R-values) or wet-pendulum methods and matters most in wet and outdoor areas. Chemical and stain resistance are graded by class — handy for kitchens and bathrooms. Crazing resistance checks that the glaze will not develop a fine web of cracks over the years. A reputable spec sheet states all of these; a vague one quietly omits the inconvenient ones.

Why the water-absorption GROUP is the most useful spec

If you remember only one thing from IS 15622, remember the absorption group printed on the box. It is the single most useful spec because it predicts so many other behaviours at once:

Density and strength — denser body (BIa/BIb) is stronger and more impact-resistant.
Stain resistance — a porous body soaks up water and staining liquids; a vitrified body does not.
Frost and weather resistance — essential for hill stations and cold regions; only BIa/BIb survive freeze-thaw.
Floor vs wall suitability — BIII is structurally a wall tile, full stop.

So before you compare prices, finishes or sizes, check the group. A cheap "vitrified-look" tile that is actually BIIb is a wall tile in disguise. This single check filters out most wrong purchases. The closely related vitrified family — double-charged, GVT and PGVT — sits at the dense BIa/BIb end; our vitrified tile flooring guide for India explains those sub-types.

How to read a tile spec sheet (and the box)

Indian manufacturers — Kajaria, Somany, Nitco, Johnson, Orient Bell, Simpolo, Varmora — publish a technical data sheet for each series and print the essentials on the carton. Here is what to look for and the value to expect for a home floor.

On the box / spec sheet	What to look for	Good value for a home floor
IS 15622 reference + ISI mark	Standard cited and BIS licence	Both present (legally required)
Water absorption / group	Group code or % value	BIa or BIb (E up to ~3%)
PEI rating (glazed)	Abrasion class	PEI III or higher (IV–V for commercial)
Nominal size + calibre	Size and batch calibre number	One calibre for the whole room
Shade / lot (dye-lot) batch	Colour batch code	Single lot + 5–10% spare boxes
Breaking strength	MOR value or "as per IS 15622"	Meets or exceeds IS 15622 limit
Slip / anti-slip rating	R-value or pendulum class	R10+ for bathrooms, balconies, entries
Rectified vs non-rectified	Edge type	Rectified for narrow modern joints

Two practical habits: always buy one calibre and one shade lot, plus 5 to 10 percent spare for cuts and future repairs; and treat any tile with no ISI mark and no stated absorption group as unverified.

ISI marking is now mandatory: the BIS QCO

This is the part many buyers miss. Ceramic and vitrified tiles in India fall under a Quality Control Order (QCO) issued by the government. Under a QCO, conformity to the relevant IS standard and the ISI (BIS) mark become legally mandatory — manufacturers (Indian and importers alike) must hold a valid BIS licence and carry the ISI mark with the licence number.

The tile QCO covers a family of standards alongside IS 15622, including IS 13753, IS 13755 and IS 13756 for related tile types. For you, the rule is simple: insist on the ISI mark and the BIS licence number. No ISI mark on a ceramic or vitrified tile in 2026 is a red flag — it may be uncertified or smuggled stock that skipped quality control. Imported tiles must comply too, so a genuine import will also show BIS conformity. Our guide to BIS marking for flooring in India walks through how to verify a licence, and you can see how IS 15622 sits within the wider rulebook in our overview of flooring standards in India.

Natural stone is governed by different IS codes (IS 1130 for marble, IS 14223 for polished granite, IS 1124 for absorption and specific gravity of stone), so do not expect IS 15622 on a marble or granite slab — see our companion on natural stone standards in India for that.

Putting it together when you buy

When you stand at the dealer, run this quick IS 15622 check before discussing price:

Is there an ISI mark and BIS licence number on the box? (Mandatory.)
What is the water-absorption group? Aim for BIa or BIb for floors.
For glazed tiles, what is the PEI rating? PEI III+ for homes.
What is the slip rating for wet areas? R10 or better.
What calibre and shade lot am I getting, and is there spare stock?
Does the spec sheet quote breaking strength, chemical and stain resistance "as per IS 15622"?

Get the brand, series, size, calibre, lot, group and PEI written on the quote. A vendor who can answer these confidently is selling you a standard-compliant tile; one who waves them away is not.

Frequently asked questions

Is IS 15622 mandatory for tiles in India?

Yes, in effect. IS 15622 is the specification for pressed ceramic and vitrified tiles, and because these tiles fall under a government Quality Control Order, BIS certification and the ISI mark are legally mandatory. Both Indian manufacturers and importers must comply, so always insist on the ISI mark and licence number.

What is the difference between IS 15622 and ISO 13006?

They are the harmonised national and international versions of the same standard. ISO 13006 is the global standard for ceramic tile classification and marking; IS 15622 is India's adoption of it. The water-absorption groups, classifications and test thresholds align, which is why Indian and imported tiles can be compared in the same language.

What water-absorption group should I choose for a floor?

For a normal Indian home floor, choose Group BIa (porcelain, absorption up to 0.5 percent) or BIb (vitrified, 0.5 to 3 percent). These dense bodies are strong and stain-resistant. Never use Group BIII (above 10 percent) on a floor — it is structurally a wall tile.

Where do I find the IS 15622 details on a tile?

On the carton and the manufacturer's technical data sheet. Look for the IS 15622 reference, the ISI mark with licence number, the water-absorption group or value, the PEI rating for glazed tiles, the calibre and shade-lot codes, and the nominal size. Reputable brands like Kajaria, Somany, Johnson and Orient Bell print these clearly.

Does IS 15622 cover the actual lab tests?

No. IS 15622 sets the pass and fail limits, while the companion standard IS 13630 (mirroring the ISO 10545 series) describes the test methods for water absorption, breaking strength, abrasion, slip, chemical resistance and crazing. The two are used together to judge whether a tile conforms.