Our Material
Food-grade 304 stainless steel
Every Synerponics Floss Holder is CNC-machined from solid 304 stainless steel, the same grade used for cutlery, cookware, and food-processing equipment. It is an alloy of iron with roughly 18% chromium and 8% nickel. The chromium forms a thin, self-renewing oxide layer on the surface that protects the steel from rust and corrosion, so the holder can be rinsed, dried, and used every day for years. Stainless steel is non-porous, so it does not absorb odours or trap residue the way plastic can, and it stands up to water, toothpaste, mouthwash, and common household cleaners. There are no plastic parts to crack or wear out, and it is dishwasher safe.
The gold finish: TiN coating
The gold version starts with the same 304 stainless steel body and is finished with titanium nitride (TiN). TiN is a hard, chemically inert ceramic whose natural colour is gold, so the finish involves no paint or dye. Because TiN is much harder than the steel beneath it, the finish resists scratches and everyday wear, and it stands up to water, toothpaste, mouthwash, and common household cleaners. Like the stainless version, it is dishwasher safe.
How it is applied
The coating is applied by physical vapour deposition (PVD). Inside a vacuum chamber, titanium is vaporized and reacts with nitrogen gas, building up a thin, dense layer of TiN that bonds tightly to the steel surface. Unlike electroplating, PVD uses no liquid chemical baths. The same process is used on drill bits, cutting tools, and watch cases, where hardness and wear resistance matter.
Independent testing
Both finishes are tested by TÜV Rheinland, an accredited third-party laboratory, against the standards applied to food-contact materials and to metal worn against skin.
| Test | Standard | Result |
|---|---|---|
| Metal migration, food/mouth contact | EC 1935/2004 | Not detected — all 24 elements |
| Nickel release | EN 1811:2023 / EN 12472:2020 | Not detected (limit 0.5 µg/cm²/week) |
| Lead and cadmium content | CPSC-CH-E1003-09.1, Prop 65 | Not detected |
Testing was performed in July 2026 on production samples in both finishes. Full reports are available on request.
Scope. Migration testing was carried out in a food-simulating solution under standardized conditions. "Not detected" means no quantity was found above the laboratory's reporting limit for that method; the reporting limits are stated in each report.
Nickel. 304 stainless steel contains nickel as an alloying element. It is held in the alloy structure and does not release under the conditions tested. Individuals with a diagnosed nickel allergy should nonetheless consider this before use.