How do I read tile product specifications - what do PEI, water absorption, R-rating mean?
Short Answer
Tile spec sheets look confusing but the key numbers are simple.
1. PEI RATING (Class I-V) - abrasion resistance:
Class I = light wall only. Class III = residential floor. Class IV = high-traffic (kitchen, foyer). Class V = heavy commercial / parking.
2. WATER ABSORPTION (%):
<0.5% = vitrified/porcelain (suitable for any application).
0.5-3% = semi-vitrified.
3-7% = ceramic (walls only, not for floors or wet areas).
3. R-RATING (R9-R13) - slip resistance:
R9 = dry indoor. R10 = bathroom floor (min). R11 = shower / outdoor. R12 = pool / commercial wet. R13 = industrial.
4. SIZE & THICKNESS:
600x600 mm at 8-10 mm thickness is standard floor. Wall tiles are usually 6-8 mm.
5. FINISH:
Matte, glossy, polished, lappato (semi-polished), textured, rustic.
6. SHADE BATCH NUMBER:
Always ordered from the same batch - tiles from different batches can vary in shade.
7. PCS PER BOX & COVERAGE:
How many tiles in a box and how many sq ft / sq m one box covers.
1. PEI RATING (Class I-V) - abrasion resistance:
Class I = light wall only. Class III = residential floor. Class IV = high-traffic (kitchen, foyer). Class V = heavy commercial / parking.
2. WATER ABSORPTION (%):
<0.5% = vitrified/porcelain (suitable for any application).
0.5-3% = semi-vitrified.
3-7% = ceramic (walls only, not for floors or wet areas).
3. R-RATING (R9-R13) - slip resistance:
R9 = dry indoor. R10 = bathroom floor (min). R11 = shower / outdoor. R12 = pool / commercial wet. R13 = industrial.
4. SIZE & THICKNESS:
600x600 mm at 8-10 mm thickness is standard floor. Wall tiles are usually 6-8 mm.
5. FINISH:
Matte, glossy, polished, lappato (semi-polished), textured, rustic.
6. SHADE BATCH NUMBER:
Always ordered from the same batch - tiles from different batches can vary in shade.
7. PCS PER BOX & COVERAGE:
How many tiles in a box and how many sq ft / sq m one box covers.
Detailed Explanation
Tile product spec sheets and box labels list a dozen technical properties that can look confusing if you've never bought tile before. Once you know what the key numbers mean, picking the right tile becomes a straightforward checklist.
Here are the specs that actually matter, and what they mean:
1. PEI RATING (Porcelain Enamel Institute Class I to V) - measures how much abrasion the tile surface can take.
1. Class I - light foot traffic, walls only. Bathroom walls.
2. Class II - light residential, walls and bathroom floors.
3. Class III - RESIDENTIAL FLOORS. Standard for bedrooms, living rooms, dining.
4. Class IV - HIGH-TRAFFIC residential and light commercial. Kitchens, foyers, hallways, small offices.
5. Class V - HEAVY COMMERCIAL. Hotel lobbies, restaurants, retail floors, parking, industrial.
For homes, look for Class III for bedrooms/living, Class IV for kitchens/foyers.
2. WATER ABSORPTION (%) - how much water the tile body absorbs.
1. <0.5% - VITRIFIED / PORCELAIN. Non-porous. Suitable for any application including outdoor.
2. 0.5-3% - SEMI-VITRIFIED. Indoor floors only.
3. 3-7% - CERAMIC. Walls only. Not for floors or wet areas.
4. >7% - Earthenware / cottage tile. Decorative wall use only.
For floors, always look for <0.5%. For walls, 3-7% (ceramic) is fine.
3. R-RATING (DIN 51130) - slip resistance when wet.
1. R9 - dry indoor floors.
2. R10 - RESIDENTIAL BATHROOM FLOORS (minimum). Kitchen floors near sinks.
3. R11 - SHOWER FLOORS, BALCONIES, OUTDOOR PATIOS.
4. R12 - SWIMMING POOL DECKS, commercial kitchens.
5. R13 - INDUSTRIAL WET FLOORS.
Anti-skid floors should be specified R10 minimum.
4. SIZE & THICKNESS
Common sizes:
1. 200x300 mm, 300x300 mm - small bathroom walls / floors.
2. 300x600 mm, 600x300 mm - bathroom walls.
3. 600x600 mm - standard floor.
4. 600x1200 mm, 800x800 mm - large-format floor.
5. 800x1600 mm - premium large-format.
6. 1200x1200, 1200x2400 mm - slab tiles.
7. 200x1200 mm - wood-look planks.
Thickness:
1. 6-8 mm - wall tiles.
2. 8-10 mm - standard floor tiles.
3. 9-10 mm - balcony / outdoor.
4. 12-18 mm - heavy floors, light pavers.
5. 18-20 mm - structural pavers, parking.
5. FINISH
1. Matte - non-reflective, hides marks, slip-safer.
2. Glossy / polished - reflective, premium, slippery when wet.
3. Lappato / semi-polished - middle ground.
4. Honed - smooth matte natural stone look.
5. Textured / rustic - anti-skid, outdoor.
6. Rectified - precise machine-cut edges for tight 1.5-2 mm joints.
6. SHADE BATCH NUMBER
Printed on each box. Tiles from the same batch are guaranteed shade-consistent; tiles from different batches can vary slightly. ALWAYS confirm at delivery that all boxes are from the same batch - mixing batches creates visible patches in the finished floor.
7. PIECES PER BOX & COVERAGE
Each box lists:
1. Number of pieces (e.g. 4 pieces in a 600x1200 mm box).
2. Coverage area (e.g. 1 box = 2.88 sq m = 30.99 sq ft).
Use this to calculate how many boxes you need (your total area × 1.10 for 10% wastage, divided by box coverage, rounded up to whole boxes).
8. OTHER USEFUL SPECS
1. Frost resistance - important if you're in a hill station or anywhere it freezes. Porcelain only.
2. Chemical resistance class (AA, A, B, C) - for industrial / lab applications.
3. Bending strength (N/mm²) - higher = more break-resistant. Important for large-format and slabs.
4. Edge type - rectified (precise machine-cut, for tight joints) vs cushion (slightly rounded, for wider joints).
5. PEI Class - already covered above.
If you're not sure what spec is right for your application, our team at Material Depot can match the right tile to your room and use case based on these specs.
Here are the specs that actually matter, and what they mean:
1. PEI RATING (Porcelain Enamel Institute Class I to V) - measures how much abrasion the tile surface can take.
1. Class I - light foot traffic, walls only. Bathroom walls.
2. Class II - light residential, walls and bathroom floors.
3. Class III - RESIDENTIAL FLOORS. Standard for bedrooms, living rooms, dining.
4. Class IV - HIGH-TRAFFIC residential and light commercial. Kitchens, foyers, hallways, small offices.
5. Class V - HEAVY COMMERCIAL. Hotel lobbies, restaurants, retail floors, parking, industrial.
For homes, look for Class III for bedrooms/living, Class IV for kitchens/foyers.
2. WATER ABSORPTION (%) - how much water the tile body absorbs.
1. <0.5% - VITRIFIED / PORCELAIN. Non-porous. Suitable for any application including outdoor.
2. 0.5-3% - SEMI-VITRIFIED. Indoor floors only.
3. 3-7% - CERAMIC. Walls only. Not for floors or wet areas.
4. >7% - Earthenware / cottage tile. Decorative wall use only.
For floors, always look for <0.5%. For walls, 3-7% (ceramic) is fine.
3. R-RATING (DIN 51130) - slip resistance when wet.
1. R9 - dry indoor floors.
2. R10 - RESIDENTIAL BATHROOM FLOORS (minimum). Kitchen floors near sinks.
3. R11 - SHOWER FLOORS, BALCONIES, OUTDOOR PATIOS.
4. R12 - SWIMMING POOL DECKS, commercial kitchens.
5. R13 - INDUSTRIAL WET FLOORS.
Anti-skid floors should be specified R10 minimum.
4. SIZE & THICKNESS
Common sizes:
1. 200x300 mm, 300x300 mm - small bathroom walls / floors.
2. 300x600 mm, 600x300 mm - bathroom walls.
3. 600x600 mm - standard floor.
4. 600x1200 mm, 800x800 mm - large-format floor.
5. 800x1600 mm - premium large-format.
6. 1200x1200, 1200x2400 mm - slab tiles.
7. 200x1200 mm - wood-look planks.
Thickness:
1. 6-8 mm - wall tiles.
2. 8-10 mm - standard floor tiles.
3. 9-10 mm - balcony / outdoor.
4. 12-18 mm - heavy floors, light pavers.
5. 18-20 mm - structural pavers, parking.
5. FINISH
1. Matte - non-reflective, hides marks, slip-safer.
2. Glossy / polished - reflective, premium, slippery when wet.
3. Lappato / semi-polished - middle ground.
4. Honed - smooth matte natural stone look.
5. Textured / rustic - anti-skid, outdoor.
6. Rectified - precise machine-cut edges for tight 1.5-2 mm joints.
6. SHADE BATCH NUMBER
Printed on each box. Tiles from the same batch are guaranteed shade-consistent; tiles from different batches can vary slightly. ALWAYS confirm at delivery that all boxes are from the same batch - mixing batches creates visible patches in the finished floor.
7. PIECES PER BOX & COVERAGE
Each box lists:
1. Number of pieces (e.g. 4 pieces in a 600x1200 mm box).
2. Coverage area (e.g. 1 box = 2.88 sq m = 30.99 sq ft).
Use this to calculate how many boxes you need (your total area × 1.10 for 10% wastage, divided by box coverage, rounded up to whole boxes).
8. OTHER USEFUL SPECS
1. Frost resistance - important if you're in a hill station or anywhere it freezes. Porcelain only.
2. Chemical resistance class (AA, A, B, C) - for industrial / lab applications.
3. Bending strength (N/mm²) - higher = more break-resistant. Important for large-format and slabs.
4. Edge type - rectified (precise machine-cut, for tight joints) vs cushion (slightly rounded, for wider joints).
5. PEI Class - already covered above.
If you're not sure what spec is right for your application, our team at Material Depot can match the right tile to your room and use case based on these specs.
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