华商宝

杜邦铁氟龙420-703涂层的详细描述：
Fact Sheet
Descri-ption
Teflon® 420-703 solvent-based primer offers superior
intercoat adhesion with PFA and FEP powders.
This primer is not recommended as a one coat.
Refer to Table 1 for physical property data.
FDA Status
Teflon® 420-703 complies with FDA regulations in
21 CFR governing components of coatings for direct
food contact when applied according to Fact Sheet
instructions. Topcoats must also comply for the
system to be FDA conforming.
Table 1
Teflon ® Primer for Powder Coatings
Typical Properties
420-703
Color Black
Weight Solids, % 30.6
Volume Solids, % 17.9
Density, lb/gal 9.5
kg/L 1.14
Coverage, m2/L* 7.1
ft2/gal* 287
Viscosity, cP 800–1600
Maximum Use Temperature **
Note: These figures are averages and may vary.
* Theoretical coverage at 25 μm (1 mil) assuming 100% spray
efficiency.
** Dependent upon Topcoat. Refer to Fact Sheet on Topcoat.
Substrates
Teflon® 420-703 primer can be used on carbon steel,
stainless steel, and aluminum substrates. Substrates
must be free of contamination and thoroughly
cleaned. To obtain maximum adhesion, gritblasting
is recommended to a profile of 4–8 μm
(0.2–0.3 mil). The primer should be applied
immediately after blasting on carbon steel to
minimize flash rusting. Refer to the Fact Sheet
on Application.
Topcoats
Teflon® 420-703 is the recommended primer for
532-5nnn, 532-7nnn, 532-8nnn, 856-Line and
857-210.
Application
1. Bring material to room temperature.
2. Mix thoroughly and filter the material through a
100-mesh stainless steel screen (0.146 mm
openings).
3. The primer is supplied ready to spray. If
further reduction is required TN-8595, a 50:50
mixture of NMP:MIBK, may be used up to
1–2% by volume.
Use conventional industrial spray equipment.
4. Apply at dry film thickness of 10–15 μm
(0.4–0.6 mil). On carbon steel, cover blast
profile for best results.
Bake
As primer for powder topcoats:
1. Spray powder directly onto wet primer, or
force dry then apply powder topcoats.
2. Bake as recommended by the Fact Sheet on
Topcoat. Note: Optimum adhesion with PFA
powder requires an initial bake of 400°C
(750°F) me-tal temperature.
As primer for liquid topcoats:
1. Force dry at 220°C (430°F) for 10 min.
Teflon® Primer for Powder Coatings
420-703
DuPont™ Teflon®
Industrial Coatings
The DuPont Oval Logo, The miracles of science®, and Teflon® are
trademarks or registered trademarks of E.I. du Pont de Nemours and
Company.
Use of DuPont trademarks is subject to License Agreement and qualification.
(1/03) RWJ14 Printed in U.S.A.
[Replaces: H-85080-1]
Reorder No.: H-85080-2
2. Apply topcoat and bake as recommended by
the Fact Sheet on Topcoat. No problems are
encountered if the primer is sprayed onto
warm (40–60°C [100–140°F]) me-tal.
Storage and Stability
Teflon® 420-703 has a shelf life of at least 18
months when stored at normal room temperature,
18–24°C (65–75°F).
Safety
Follow normal industrial safety practices for handling
and applying Teflon® products. Industrial
experience has clearly shown Teflon® materials
can be processed and used at elevated temperatures
without hazard providing adequate ventilation
is used. Ventilation should be available at baking
temperatures of 275°C (525°F) and above. Before
using Teflon®, read the Material Safety Data Sheet
(MSDS) and the detailed information in the “Guide
to the Safe Handling of Fluoropolymer Resins,”