Fastener Guide / Plating, Coatings & Finishes

Zinc-Flake - ASTM F3393 Overview

Zinc-flake systems are zinc (and often aluminum) flakes in a binder, applied by dip-spin or spray and cured. They are thin, non-electrolytic and give high salt-spray resistance.

Last reviewed 2026-09-10 · Governing standard: ASTM F3393-24; ISO 10683:2018 · reference FG-AE4826 · Report an error on this sheet

ASTM F3393 at a glance

ReplacesASTM F1136, F2833 and F3019 (consolidated in 2020; current edition 2024)
ChromiumMust be free of hexavalent chromium
ThicknessAbout 6 - 12 micrometres typical
Hydrogen riskVery low: non-electrolytic
MetricISO 10683

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Zinc-Flake - ASTM F3393 Overview

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Zinc-flake coatings · ASTM F3393 overview

What it is

FIELD IDENTIFICATION

Zinc-flake systems are zinc (and often aluminum) flakes in a binder, applied by dip-spin or spray and

cured. They are thin, non-electrolytic and give high salt-spray resistance.

ZINC FLAKE

Thin dip-spin zinc flake

ASTM F3393 at a glance

Replaces

ASTM F1136, F2833 and F3019 (consolidated in 2020; current edition 2024)

Chromium

Must be free of hexavalent chromium

Thickness

About 6 - 12 micrometres typical

Hydrogen risk

Very low: non-electrolytic

Metric

ISO 10683

Key points

Common on automotive and on A490 and 10.9 parts where electroplating is not allowed.

Thin coatings are damaged by rough handling; salt-spray ratings assume an undamaged part.

Governing standards: ASTM F3393-24; ISO 10683:2018. Editions shown are the latest confirmed as of September 2026. The drawing and the governing standard always take

precedence over this sheet.

torquing any fastener. Verify the current governing standard, project documents, OEM requirements, size, thread, coating and lot certification. To the fullest extent permitted by law, The Fastener App disclaims liability

arising from reliance on this reference.

Fastener Guide reference FG-AE4826 · thefastenerapp.com/fastener-guide/plating-coatings-finishes/zinc-flake-astm-f3393-overview · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

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