All the straps manufactured at Sona are aesthetically designed with utmost importance to consistent quality and attention to detail. High-quality raw materials and leathers are sourced using a superior global supply chain, and a range of stringent quality checks are conducted before they are approved for production. At each step of the manufacturing process, extensive quality checks are performed, so that our straps are ideal for the spirit of jewellery timepieces. Each of our straps is a testimony of the workmanship of our artisans.
VARIETY OF TESTS CONDUCTED FOR OUR LEATHER QUALITY
Strap shall be subjected to 750 strokes with 2.5 kg load. To test the wear and tear.
LOOP STRENGTH TEST
Should withstand a strength of 5 kg for 5 secs.
An adhesive gum tape is stuck on the strap and pulled off immediately. This is to ensure that the printing on the strap should not come off.
WET RUB TEST
A manual test to assess any color transfer from the leather raw material.
Should not develop any cracks / wrinkles on the surface when rolled on a rod of dia 10mm.
LIGHT FASTENING (UV) TEST
Expose to UV light with a 300W bulb for 48 hrs at 20cms distance. Determination of fastness to daylight of the colored leather.
SOFT AND HARDNESS TESTS
Manual inspection of the incoming leather for softness. Hard leathers are rejected.
Only CLRI (Central Leather Research Institute) certified leather used – Skin compatible (No skin irritation)