Types of Porcelain Tile and the PEI Wear Rating: How to Choose
Glazed, full-body, double-loading, polished porcelain tile: how they differ, what PEI class 0–5 means, and how to pick tile for the right zone.
Most buyers choose porcelain tile by color and texture and overlook the one thing that determines how long it lasts: the technology behind the surface. The same “marble-look” design can exist in three different manufacturing grades, each with a different price and a different service life. Here’s how porcelain tile types differ, what the PEI rating actually means, and how to read a technical spec so you don’t end up with tile that wears through in two years.
Porcelain tile vs. ceramic tile
Ceramic tile is formed from a clay mix and fired at a lower temperature — it is more porous and lighter. Porcelain tile is pressed under high pressure from a mix of clay, feldspar and quartz sand, then fired at 1200–1300°C — the result is dense, with low water absorption and high mechanical strength. That’s why the applications differ: ceramic tile mostly goes on walls and light-duty floors, while porcelain handles high-traffic floors, façades, and commercial or outdoor spaces.
Porcelain tile types by manufacturing technology
- Glazed (GVT, Glazed Vitrified Tile). Pattern and protective layer are applied on top of a dense pressed base. Offers the widest range of designs — marble, wood, concrete, fabric looks — at a lower price than full-body tile. Limitation: a chip reveals the lighter base body, and the glaze wears faster than the tile body, so glazed porcelain is a weaker fit for heavy traffic.
- Full body / technical (unglazed). Color and pattern run through the entire thickness. Chips are invisible and wear resistance is at its maximum — the standard for airports, malls, and industrial floors. Costs more than glazed tile, with a narrower design palette.
- Double loading / double charge. A middle ground between glazed and full-body: colored granules are pressed 3–5 mm into the tile rather than all the way through. Wear resistance is close to full-body (PEI 4–5) at a noticeably lower price — a practical choice for mid-budget commercial projects.
- Polished / glossy. The surface is ground to a mirror finish. Visually the most premium option, but polishing removes the top layer and opens the pores — stain resistance drops and slip resistance falls to R9. Suitable only for dry zones: lobbies, living rooms, bedrooms.
- Lappato / semi-polished. Partial polishing leaves part of the surface matte — combining shine with acceptable grip (R10). Popular for living room floors in premium interiors.
- Matte / structured (anti-slip). Untreated or textured surface, rated R10–R13. Mandatory for terraces, pool decks, entryways, bathrooms and any wet zone.
- Large-format (slabs, 900×1800 to 1600×3200 mm). Thin large-format panels for seamless floors and ventilated façades. These need dedicated logistics and rigging — more on this in our guide to sourcing tile and porcelain from China.
The PEI wear rating: what the numbers mean
PEI (Porcelain Enamel Institute) is a test that abrades the tile surface with a rotating abrasive disc under a controlled load. The more cycles the tile withstands before showing visible glaze damage, the higher the class.
| PEI class | Traffic level | Where to use |
|---|---|---|
| PEI 0–1 | Barefoot only, no sand or grit | Walls, bedrooms without outdoor shoes |
| PEI 2 | Light residential traffic | Bedrooms, bathrooms with soft footwear |
| PEI 3 | Normal residential traffic | Living rooms, kitchens, residential floors in homes and villas |
| PEI 4 | Medium-to-heavy traffic, including street shoes and sand | Entryways, hallways, cafés, small shops |
| PEI 5 | Heavy commercial and industrial traffic | Shopping malls, airports, hotels, production floors |
PEI 3–4 is enough for most residential projects. Paying extra for PEI 5 in a home is unnecessary — that class is justified only where thousands of people cross the floor every day.
Other specs to check alongside PEI
PEI only measures surface abrasion — it says nothing about strength or water resistance. A complete picture requires several specs together:
- Water absorption. Technical porcelain is rated at ≤0.5% (group BIa under ISO 13006), making it suitable for pools and façades; standard ceramic tile can absorb up to 10%.
- Slip resistance R (DIN 51130). R9 for dry indoor floors; R10–R11 for bathrooms and entryways; R12–R13 for open terraces, ramps and pool decks.
- Flexural strength (ISO 10545-4). Especially important for large-format tile and slabs installed on walls and façades.
- Frost resistance. Required for outdoor installation in climates with sub-zero temperatures; not a factor for projects in Thailand, the UAE or Indonesia.
Matching porcelain tile to the application
| Application zone | Tile type | PEI | R class |
|---|---|---|---|
| Walls, décor | Glazed | 0–2 | — |
| Bedroom, living room | Glazed / lappato | 3 | R9 |
| Kitchen, apartment entryway | Glazed / double loading | 4 | R9–R10 |
| Terrace, pool deck | Matte structured | 4–5 | R11–R13 |
| Façade (ventilated) | Full body, slabs | 4–5 | — |
| Hotel lobby, restaurant | Double loading / lappato | 4 | R9–R10 |
| Shopping mall, airport | Full body | 5 | R10–R11 |
What to specify when ordering from a factory
- PEI class and an ISO 10545 test report for the specific production batch (not a generic certificate for the SKU).
- Water absorption group (BIa/BIb) — especially for pools, façades and outdoor zones.
- Slip resistance class R with the standard cited (DIN 51130) for all wet and outdoor zones.
- Caliber and batch — the entire installation area should come from a single production run, or tone variation between batches becomes unavoidable. More on this in our guide to sourcing tile from China.
During pre-shipment inspection, tone and caliber on every pallet are checked against the approved sample; PEI and water absorption figures are verified through a separate lab report for disputed or high-stakes orders (commercial projects, pools, façades).
Sourcing porcelain tile from China through Dream View
Dream View is a sourcing agent with a fixed 10% commission on order value. We match projects with the right factory — from residential PEI 3 to industrial PEI 5 — align test reports before production starts, and verify tone and caliber against the batch during pre-shipment inspection.
Outfitting a villa, hotel or commercial project and need porcelain tile with a specific wear rating and water absorption spec? Email us at orders@dreamviewchina.com or request a quote on our services page — we’ll shortlist factories and estimate cost and delivery for free.
Frequently asked questions
What is the PEI rating and how is it tested?
PEI (Porcelain Enamel Institute) is a lab test that abrades the tile surface with a rotating abrasive disc under controlled load. Based on the number of rotations before visible wear appears, the tile is assigned a class from 0 to 5. The class should appear on the batch technical datasheet and packaging — request the document from the factory rather than relying on a sales rep's word.
What PEI class do I need for an apartment floor?
PEI 3 is enough for living rooms and bedrooms. For kitchens, entryways and hallways, where traffic is heavier, use PEI 4. PEI 5 is overkill for a home and only makes sense in high-traffic public spaces: hotel lobbies, shopping galleries, airports.
What is the difference between glazed and full-body porcelain tile?
Glazed porcelain (GVT) has its pattern and protective layer applied on top of a dense pressed base — a chip reveals the lighter base body underneath. Full-body (unglazed, technical) tile carries color and pattern through the entire thickness: a chip is invisible, and wear resistance is higher, which is why it is used for heavy commercial traffic.
What is double-loading porcelain tile?
It is an intermediate technology: colored granules are pressed 3–5 mm into the tile thickness rather than all the way through, as with full-body tile. Wear resistance is close to full-body (PEI 4–5) at a noticeably lower price — a solid choice for commercial projects on a tighter budget.
Is polished porcelain tile slippery?
Yes — polishing removes the top layer and opens the pores, lowering the friction coefficient. Slip resistance typically drops to R9, below the standard for wet zones. For pool decks, terraces and bathrooms, choose matte or structured porcelain rated R10–R13 under DIN 51130.
How do I verify PEI and water absorption for a batch before it ships from China?
Request a test report under ISO 10545 (or the equivalent Chinese GB standard) for the specific production batch, not a generic certificate for the SKU — values can vary between production runs. During pre-shipment inspection, tone, caliber and packaging integrity are checked; lab-tested PEI and water absorption figures are verified separately through an accredited lab for disputed or high-stakes orders.