About
About Devtaş
A family-run natural stone company from Develi, Kayseri, turning the volcanic rock of Mount Erciyes into surfaces for the world.
Our story
Rooted in the stone of Erciyes
Devtaş was founded in 2007 in Develi, a town on the southern slopes of Mount Erciyes, the extinct volcano whose lava flows created the basalt plateau of Kayseri. Basalt from this region has been used in Anatolian architecture for centuries; our founders set out to produce it to modern standards and at industrial scale.
Within its first years the company built its plant with 5,000 m² of covered halls and 25,000 m² of open yard, opened its own basalt quarry and began supplying major public projects across Türkiye. Investment in diabase and Ottoman Green quarries followed, widening the range of stones we can offer from a single source.
Today around 40% of our basalt production is exported to seven countries. We work with importers, stone distributors, contractors and architects who need a reliable supply of consistent material, backed by European test data and export-ready packaging.
Milestones
Nearly two decades of growth
2007
Foundation
Devtaş is founded in Develi, Kayseri, and begins extracting basalt.
2010
Processing plant
By 2010 a modern plant with 5,000 m² of covered halls and 25,000 m² of open yard is in operation.
2013
Landmark projects
Mersin Arena Stadium, built for the Mediterranean Games, and the Presidential Complex in Ankara are supplied with Devtaş basalt.
2010–2020
New quarries
A diabase quarry in Tokat and an Ottoman Green quarry come on stream, widening the range beyond basalt.
2026
Devtaş Global
A dedicated export brand and multilingual platform for international buyers.
How we work
Principles that shape every order
Quality without compromise
Every block is graded, every batch is inspected. We would rather reject material than ship it.
Reliability
Because we own the quarries and the plant, we control lead times ourselves and quote dates we can keep.
Partnership
We support importers and contractors with drawings, samples, test data and technical advice from the first inquiry to installation.
Sustainability
Responsible quarrying, our own rooftop solar power and efficient use of natural resources.
EN 1469 · EN 12057 · EN 12058
Technical data
Declared values from the CE Declaration of Performance for Devtaş basalt, tested to European standards.
- Apparent density
- 2,739 kg/m³EN 1936
- Flexural strength (mean)
- 21.37 N/mm²EN 12372
- Flexural strength after frost (mean)
- 20.05 N/mm²EN 12371
- Change after 12 freeze-thaw cycles
- 6.18 %EN 12371
- Water absorption at atmospheric pressure
- 2.19 %EN 13755
- Apparent porosity
- 2.23 %TS 699
- Abrasion resistance
- 6.095 cm³ / 50 cm²EN 14157
- Capillary water absorption coefficient
- 7.26 g/m²·s½EN 1925
- Hardness
- 6 MohsEN 101
- Reaction to fire
- Class A1 (non-combustible)2000/65/EC
- Slip resistance
- Slip-resistant (surface roughness > 1 mm)EN 14231
| Property | Declared value | Test method |
|---|---|---|
| Apparent density | 2,739 kg/m³ | EN 1936 |
| Flexural strength (mean) | 21.37 N/mm² | EN 12372 |
| Flexural strength after frost (mean) | 20.05 N/mm² | EN 12371 |
| Change after 12 freeze-thaw cycles | 6.18 % | EN 12371 |
| Water absorption at atmospheric pressure | 2.19 % | EN 13755 |
| Apparent porosity | 2.23 % | TS 699 |
| Abrasion resistance | 6.095 cm³ / 50 cm² | EN 14157 |
| Capillary water absorption coefficient | 7.26 g/m²·s½ | EN 1925 |
| Hardness | 6 Mohs | EN 101 |
| Reaction to fire | Class A1 (non-combustible) | 2000/65/EC |
| Slip resistance | Slip-resistant (surface roughness > 1 mm) | EN 14231 |
Values are averages from the manufacturer's CE Declaration of Performance (EN 1469 / EN 12057 / EN 12058). Full test reports and the current ISO 9001 certificate are available on request for tender files.
Reference standards
- EN 1469Slabs for cladding
- EN 12057Modular tiles
- EN 12058Slabs for floors and stairs
Certificates
Visit us in Develi
We welcome customers at our quarries and plant. Tell us when you plan to be in Türkiye and we will organise the visit, including transfers from Kayseri airport.