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PTFE Coating Services

Delta Coatings & Linings offers industrial coating services using PTFE in Louisiana and surrounding areas. The PTFE coatings services are excellent for non-stick applications.

Key Characteristics

• Non-stick
• Corrosion resistant
• Chemical resistant
• High temperature resistant

What are PTFE Coatings?

PTFE, also known as Polytetrafluoroethylene, is a non-stick fluoropolymer coating with a high-durability thin-film coating. Their fluorocarbon properties provide resistant to corrosive chemicals, extreme temperatures, UV ray resistant and low friction. The PTFE non-stick fluoropolymer coating is typically used in applications needing a smooth, low friction, corrosion resistant coatings.

In addition, PTFE coatings have outstanding release properties for high temperature applications and can withstand a maximum use temperature of 500°F and a melting point of 627°F. It is typically applied with approximately 1 mil thickness. This coating can be applied to many different materials including aluminum, carbon steel and stainless steel.

Types of PTFE Coatings

The 958G-414 is a Low Bake One Coat not intended for food contact, which is designed for easy and flexible application combined with balanced properties. It offers excellent adhesion, a low coefficient of friction and good corrosion resistance while providing a hard and wear resistant coating. 958G-414 can be cured as low as 30 min at 180°C but optimum properties are obtained when baked 15 min at 225°C. Hardness is increasing when cure temperature is increased.

PTFE Coating Applications & Industries

These coatings can benefit many industries that demand extreme resistant for their coatings. Some of these industries include the following:

• Chemical Processing – The chemical processing industry benefit from using PTFE coatings because of their chemical resistance and high-temperature properties. Common PTFE coating applications for this industry include molds and other parts.
• Commercial Cookware – It’s important for the coatings the appliance and cookware industry use are low density and corrosion resistance with food-grade properties. This is why PTFE coatings are an ideal option. The typical applications for the commercial cookware industry include bakeware, food processing parts, and more.
• Medical & Healthcare – PTFE coatings are formulated to provide strength and heat resistance to surgical devices and other medical equipment.

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Property Data ¹

Product Code	958G-414
Color	Green
Closest RAL	7026
Coverage,² m²/kg	7.64
Viscosity,³ centipoises	2000-3500
Volume Solids,4 %	20.7
Weight Solids,4 %	21.5-30.0
Density, kg/l	1.081
US VOC (as packaged) content, lbs/gal	6.6
Maximum In-use Temperature, °C	200
Flash Point, SETA closed cup, °C	40

¹ Physical constants are averages only and are not to be used as product specifications. They may vary up to 5% of the values shown
² Theoretical coverage (m2/kg) at 25 um dry film thickness (DFT) and based on 100% application efficiency. It does not take nermal production losses into account.
³ Brookfield RVT (internal method based on ASTM D2196 or equivalent) (Measured with spindle 3 at 20 RPM@25C),
⁴ Weight Solids (internal method based on ASTM D2834), % Measured at 30'x105C+10'x220C

PTFE Application Method

Substrate - any metal substrate except high copper containing alloys. Pre-treatments, withstand the curing temperature, are suitable.

Surface preparation – Degreasing, grit blasting (recommended Ra= 2-3Um). Some end-uses even allow the application on smooth substrate.

Filtering - 100 mesh (approx. 150um) stainless steel or nylon

Mix well before use – Excessive rolling can create foam. Set the mixer sped so that a strong vortex is appearing. We recommend the use of an axial flow impeller (min 3 blade). Its size should be 10-12 cm for the 4kg packaging. 17-20cm for the 20kg packaging and 25-30cm for 200kg packaging.Typically the rotational speed would be in the range of 200-500 rpm. Mix minimum 20min.

Recommended DFT – depending on the application requirements, once can coat from 25-120um. Several layers can be sprayed on top of each other.

Application - can be applied on cold and warm substrate.
Preheat the part to max 50°C {metal T°). Never exceed 60°C substrate temperature.
  Preheating temperature results in a smoother coating.
  Apply first coat max 40 um & dry 5-10 min at 60-80°C (Until product is not tacky anymore)
  Apply next coat ma. 40 um & dry each intermediate coat 5-10 min at 60-80 °C
  If several layers are applied, it’s recommended to dry for a longer period to be sure that the underneath layers are dry. In case underlying layers are not dry enough, it might result in blister formation.
  After last coat was applied, dry 20min at 80-100 °C, then 60min at 150 °C

Cure – Finally cure 9586—414 at 225°C for is minutes. If one can accept compromise terms of Coefficient of friction and mechanical properties (3.0. Hardness and abrasion“ resistance), coating can be cured 30 min at 180°C. Hardness is in creasing when cure temperature is increased (tested up to 240°C)

Typical spray settings - Depending on the type of guns, thinning can be necessary Gun: FiP (Reduced pressure) guns, or conventional. Nozzle: 10—1 .5 mm Air pressure: 2—5 bar

Clean Lip/Thinner Thinning can be necessary depending on the spray methodology: TN—8595 for cleaning and thinning

Handling and Storage

• Mix before use. Bring the product to room temperature to facilitate the mixing operation before filtering and spray.
• Storage life is 18 months at room temperature (1 8°C-27°CI)
• Protect from freezing

Food Contact

This material is not intended for use in direct contact with food.

Disposal and Other Considerations

Please follow these disposal guidelines as outlined in "The Guide to the Safe Handling of Fluoropolymer Resins," :

• All treatment, storage, transportation, and disposal of this product and/or container must be in accordance with applicable national and local regulations.
• Do not discharge aqueous dispersions to lakes, streams or waterways
• Separate solids from liquid by precipitation and decanting or filtering. Dispose of dry solids in a landfill that is permit-ted, licensed or registered to manage industrial solid waste. Discharge liquid filtrate to a wastewater treatment system.
• Incinerate only if incinerator operates at 800°C or higher and is capable of scrubbing out hydrogen fluoride and other acidic combustion products.
• Industrial fluoropolymer waste containing additives such as solvents, primers or thinners must be regarded as special waste. Companies should contact their local waste disposal authorities for details of the relevant waste disposal regulations.
• Empty containers should preferably be cleaned and recycled. If this is not possible, the containers should be punctured or otherwise destroyed before disposal.
• A copy of the "Guide for the Safe Handling of Fluoropolymer Resins" is available from DuPont upon request.

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For more information on DuPont Industrial Nonstick Coatings, please call Delta Coatings and Linings at 225-355-0204