25 Common Defects in Sanitaryware Manufacturing

Common Defects in Sanitaryware

Defects in sanitaryware affect the yield of production. Common defects may arise from raw materials, handling, or process issues.

1. Cracks – One of the major defects found in the sanitaryware production process. Separation/split of sanitaryware surface without breaking apart.
2. Blisters – Blistering is a sharp-edged burst bubble. Can be found in fired ware.
3. Crazing – Crack in glaze surface area.
4. Pinhole – Small holes in the ware.
5. Poor finish – Improperly finished ware at the green stage which is found after firing.
6. Improper/Defective logo – Logo is not properly printed or positioned.
7. Iron specks – Iron speck found in glaze surface. The defect can be found after firing.
8. Stuck – Two or more wares stuck together during the firing of ware.
9. Chipping – Small broken piece from the ware.
10. Light glaze – Less glaze in ware than necessary.
11. Heavy glaze – More glaze in ware than necessary.
12. Wavy glaze – Waviness of glaze due to improper glaze application.
13. Crawling – Small portion of the glaze separates from ware leaving the ware exposed.
14. Leakage – Leak found in ware during water-filled and flushed test.
15. Poor repair – Defect due to poor repairing at various stages of the process.
16. Pitting – Small pits in glaze found after firing.
17. Matte glaze/Under fired – Improperly fired or matte glaze in ware.
18. Warpage – Bending in ware.
19. Sulphuring – Dull scum on glaze surface found after firing.
20. Knocked glaze – Glaze knocked off during the process.
21. Color fading – Color disappearing after firing.
22. Bloating – Gas bubble trapped in the body during firing.
23. Blown out – Impurities burn out during firing.
24. Dunting – Crack formed at silica inversion stage and the glaze filled the crack.
25. Peeling – Glaze lifts away from the body.

Did we cover all defects? Share your thoughts in the comments section below. Learn more about 40 laboratory tests involved in sanitaryware and the sanitaryware production process.