Page 41 - ZSi-Foster-Engineering-Catalog-2019
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 Superior Corrosion Resistance
The ZSi-Foster Silva-Guard finish provides one of the highest levels of corrosion resistance for spring steel fasteners available on the market. ZSi-Foster Silva-Guard coating is extremely consistent providing a finish that combines superior appearance and outstanding protection.
This aesthetically pleasing appearance is particularly important for installations in highly visible areas, such as open ceilings.
Innovative Three Step Coating System
The ZSi-Foster Silva-Guard finish is a three step coating system that is RoHS, WEEE, and ELV compliant.
• The first step is surface preparation involving a process designed to improve the coating adhesion.
• The second step is a base coat designed to self-heal from nicks and scratches as well as sacrifice itself instead of the fastener base material.
• The third step is a topcoat designed to be an additional protective barrier.
SG Finish is
dry applications.
Spring Steel:
Cold Roll, ASTM A684 Grade 1055 Spring Steel
Carbon Steel: ASTM A1011-00 SS GR 33 or ASTM A1011-00CS Type B
304 Stainless Steel: ASTM A240 (Type 304) 316 Stainless Steel: ASTM A240 (Type 316) 316 Stainless Steel Nuts: ASTM A276-03 Aluminum: ASTM B209 (Type 5052-H32) SG – ZSi-Foster Silva-Guard
ZSi-Foster Silva-Guard coating is a multi-step process that meets the 1000 hour salt spray test per ASTM B117 and DIN 50021.Silva-Guard coating is WEEE, ELV and RoHS compliant. SG Finish is approved for outdoor as well as indoor applications. It is a chrome free duplex coating system that combines an inorganic zinc-rich basecoat with an aluminum-rich organic topcoat.
Listed for indoor, outdoor, wet, and
Note: See ZSi-Foster General Engineering Catalog for additional information.
Material & Finishes
 The ZSi-Foster Silva-Guard Finish
Material & Finish Specifications
All listed materials and finished are RoHS compliant.
PG – Pre-galvanized Zinc
ASTM A653 G-90 Pre-galvanized zinc is produced by continuously rolling steel coils or sheets through molten zinc at the mills. The coils or sheets are slit to size and fabricated by forming, shearing or punching to produce the finished product. During fabrication cut edges are not generally zinc coated; however, the zinc near the uncoated metal becomes a sacrificial anode to protect the bare areas.
EG – Electroplated Zinc or Electro-Galvanized
This coating is standard for most ZSi-Foster products. Electro- Galvanized products meet ASTM B633 SC1 or SC3, Type III. Electroplating deposits zinc on the surface of the steel by electrolysis from a bath of zinc salts. The thickness of zinc applied in this method is between 0.2 mils to 0.5 mils [5.1 μm to 12.7 μm].
Note: Specifications subject to change without notice.
 Spring Steel Catalog
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