How to read a tile specification sheet
May 2026
Every tile on sale in Australia has a technical data sheet — a one or two page document that contains more useful information about whether a tile is right for your project than any lifestyle image or showroom sample. Most buyers never read it. The buyers who do avoid the two most common and most expensive tile mistakes: specifying a tile with the wrong slip rating for a wet area, and ordering a tile that is technically unsuitable for the application it is being laid into.
PEI abrasion rating
PEI stands for Porcelain Enamel Institute, an American testing standard that measures how much surface abrasion a glazed tile can take before visible wear shows. The rating runs from Class 0 to Class 5.
| Class | Use |
|---|---|
| 0 | Wall only — no abrasion resistance |
| 1–2 | Light residential — bedrooms, bathrooms without shoes |
| 3 | Residential floor, light traffic |
| 4 | Residential high traffic — kitchens, hallways, entries |
| 5 | Commercial and heavy industrial use |
Specifying a PEI 2 tile on a kitchen floor means visible surface wear — dulling, micro-scratching, glaze loss in the busiest zones — within two years. Match the class honestly to the room.
Slip rating (R-rating and wet pendulum)
Slip rating in Australia is most often expressed as an R-rating from R9 to R13, a German DIN standard measured on a ramp underfoot.
| Rating | Application |
|---|---|
| R9 | Dry interior — bedrooms, living rooms, dry powder rooms |
| R10 | Wet area floors — AS 4586 minimum for bathrooms |
| R11 | Outdoor paving and external entries |
| R12–R13 | Pool surrounds, commercial wet areas |
For pool tile specifically, the wet pendulum test (P-rating, P3–P5) is more important. P3 is the residential minimum for pool surrounds. The R-rating and P-rating are usually printed together on the spec sheet, often in a small grid alongside frost resistance and water absorption.
Water absorption
Water absorption is expressed as a percentage by weight and matters most for outdoor and frost-affected use. Below 0.5% is fully vitrified porcelain — frost-safe, suitable for any outdoor Australian application. Between 0.5% and 3% is semi-vitrified, with limited outdoor use and a risk in alpine areas. Above 3% is ceramic body — indoor wall use only.
This number also dictates how the tile takes a sealer. Porous, high-absorption tiles drink sealer and need re-application. Impervious vitrified porcelain does not absorb sealer at all and should not be sealed on the body — only the grout joints benefit from sealing.
Breaking strength / modulus of rupture
Breaking strength measures how much load a tile can take before it cracks, reported in Newtons per square millimetre. The Australian residential minimum for floor tiles is 35 N/mm². This number matters most for large-format tiles over heated floors (where thermal movement adds stress) and any commercial or heavily loaded application. For standard 600×600 residential floors, almost any porcelain on the market exceeds the minimum comfortably.
Chemical resistance
Chemical resistance is graded from Class A (highest) through to Class D and matters in two specific places: pool tile (chlorine and pH balancers) and kitchen splashbacks near the cooktop (acidic food residue, strong cleaning products). Glazed porcelain typically rates Class A or B. Unglazed natural stone is the opposite — acidic spills like lemon juice etch a polished marble surface in minutes if not wiped immediately.
How to request a spec sheet
Ask the supplier directly, or look on the product page for a section labelled Technical Documents, Downloads, or Spec Sheet. Reputable Australian tile retailers publish the sheet alongside every product. If a supplier cannot produce a spec sheet for a tile they are selling, treat that as a red flag — it usually means the tile is sourced through an unregulated channel and its technical claims are unverified.
Frequently asked questions
Where do I find a tile's technical data sheet?
Usually linked from the product page under Technical Documents, Downloads or Spec Sheet. If not on the page, request it from the supplier — any reputable retailer will send it within a day.
What's the most important number on a tile spec sheet?
For wet areas: slip rating (R-rating). For floors generally: PEI abrasion class. For outdoor use: water absorption. The right answer depends entirely on where the tile is being laid.
Do all tiles sold in Australia have specification sheets?
Every legitimately imported or manufactured tile has a spec sheet from the factory. If a retailer cannot provide one on request, the tile is likely from an unregulated source.