Electrolytic Tinplate (ET)
The traditional material used in the manufacture of steel cans. The tin
coating can be deposited either equally or differentially on each surface. The mass of tin
on each surface is expressed in grams per square metre (g m-2) and can be
supplied down to a minimum of 0.5 g m-2, and up to a maximum of 11.2 g m-2.
The tin used has a purity of not less than 99.85%. ET material can be joined by welding or
adhesive bonding.
Electrolytic Chromium/Chromium Oxide Coated Steel - ECCS (Hi-Top)
Used for making can ends and in some light engineering applications.
ECCS has a coating which is a duplex structure and consists of approximately 80% chromium
metal adjacent to the steel substrate and 20% hydrated chromic oxide/hydroxide in a layer
above it. ECCS material is normally joined by adhesive bonding.
Polymer Laminated Steel (Ferrolite)
Ferrolite polymer film coatings adhere to the substrate (ECCS material
is used as the substrate) through the use of special bonding layers which are co-extruded
with the main polymer layer. The main types used are: Polypropylene (PP), Polyethylene
terephthalate (PET) and Nylon (N)polyamide.
Hot-Dip Lead/Tin Alloy Coated Steel (Ternex)
Ternex is cold reduced sheet and coil that is hot-dip
coated with an alloy
of lead and tin. A nickel flash film is electro-deposited
onto the steel substrate before the dipping process. The
inherent inertness of the alloy coating gives excellent
corrosion resistance in a wide range of conditions, further
enhanced by the reduced porosity offered by the nickel layer.
The exceptionally strong bond formed between the coating
and the steel base permits extra deep drawing of the product
without flaking or cracking of the coating. Ternex can be
seam or spot welded, soft soldered or brazed, using normal
methods.
Pre-Painted Steel (Colorcoat / Stelvetite)
The basic difference between the two materials is that Colorcoat products are
pre-painted coatings i.e. they are applied in liquid form, whereas Stelvetite is a film
laminate coating bonded to the steel by an adhesive. A variety of coatings is available to
meet the demands of many different applications. Colorcoat or Stelvetite, or both, are
used for domestic appliances, consumer and industrial electronic equipment (video, audio,
computers, microwaves, etc.) automotive components, shelving, office furniture, interior
walling and cladding, doors, gas and electric heating appliances, and scientific and
telecommunications equipment.