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Plastisol vs. powder coating

 

Hello,

We are a company in Turkey which want to work with plastisol coating. But our mind is a bit confused. Could you help us about plastisol coating? I mean its detail. And what is difference between plastisol coating and powder coating? Which one is more useful? Please give some information

Thank You, Best Regards,

EMINE ERSOY
- Maltepe, Istanbul, Turkey


 

Powder coat and plastisol are very different. Powder coat is an electrostatic paint spray process. The details for this process can be found in the Organic Metal Finishing Guidebook put out by Metal Finishing Magazine.

Plastisol is a very thick coating of plastic applied by dipping a part into a liquid solution. Plastisol is used on bare tools (wrenches, pliers, etc.) to give it a nicer grip area. It is also used to coat plating racks to prevent the rack from picking up plating each time is goes through the plating tank.

Powder coat is much cheaper, and I imagine that this is what your customers are looking for. Plastisol is only used for more specialized applications when a thick non-conductive plastic coating is desired.

Tim Neveau
Rochester Hills, Michigan

 

Generally, these topcoats are a thick tough surface finish with a flexible system and good adhesion. They are applied through dip molding, Plastisol bed coating and fluidized bed coating. They can be custom compounds to achieve hardness, flexibility, color, surface appearance, abrasion resistance, flame retardation, insulation and other desired characteristics to meet customer specifications. These compounds plastisols (PVC) can be designed for a wide variety of industrial and commercial applications serving the medical, toy, leisure, recreational, construction, textile, and automotive markets including:

Plastic coated
Handle grips
End caps
Hose protectors
Garlic peelers
Trailer ball covers
Diving tank protectors

To apply a PVC type coating, the metal part or rack that will be coated must be physically clean prior to application of the primer and plastisol.(PVC's generally require a primer before topcoat application but can also be applied with powder equipment).

Dip, spray or brush primer onto the metal part making sure the area that will receive the plastisol is covered with the primer. Place the part into an oven that has been preheated to 350-375 degrees F. The primer is cured when the metal part reaches 350 degrees F. The time for this occurs depends upon the mass of the metal part, the efficiency of the oven and other factors. Remove the heated part from the oven and immerse it into the liquid plastisol. Slowly withdraw the part moving it sideways very slowly to make sure the desired area is covered. The thickness of the coating will depend upon the mass of the metal part and the rate of withdrawal rate. Allow the part to drip so as to minimize any "tear drops."

Place the coated part into a preheated 350-370 degree F oven and bake until the internal temperature of the plastisol reaches 350 degrees F. Baking time will vary depending upon the size and mass of the part as well as the efficiency of the oven. One indicator that the plastisol has cured is that the coating will become glossy in color.

Also please note that many company's use molten salt as a cure for their PVC lines and in a dip system. The primers are then generally a water-based primer.

Plastisols are measured using a Durometer. Some of the coatings carry vinyl dispersion containing MEK and MIBK. PVC carries Plastisol, vinyl and nylon materials and are usually developed for ultra thickness and durability.

Powder coats on the other hand are generally developed for less physical type durability and more cosmetic appeal, especially with thermo-setting topcoats. Thermoplastics are generally designed for more frictionless type functions and do not see the thickness that PVC can acquire.


Bob Utech
Benson, Minnesota

 
Editor's note: 
Mr. Utech is
the author of -->


A Guide to High Performance Powder Coating
[link is to this book on Amazon]


 

I think you have not answering correctly about "plastisol coating". In fact "plastisol coating" has very little to do with "dipping" but mainly to "knife coating" to produce synthetic leather. If you want to know more please don't hesitate.

Regards,

PASQUALE CARLINO
- VERONA, ITALY


 

Often a term can have more than one meaning, which may be the case with 'plastisol coating', Mr. Carlino. But the previous responders are correct that, in one context at least, plastisol coating involves dipping the object into a hot tank containing liquid, plasticized, polyvinyl chloride. This is widely used as a tank lining, a coating for electroplating racks, a corrosion resistant coating for steel parts that will be exposed to acids, etc. I've heard the term widely used by hundreds of people in the plating industry for over 40 years.

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Brick, New Jersey

 

Hello,

I would like to know about the primer used for the dip coating.

1. Is it 1-pack or 2-pack?
2. Is it solvent-based?
3. what kind of resin system does it consist of (e.g., acrylics, epoxy etc)?
4. can any additives be added to improve adhesion?

I hope someone can answer these or perhaps recommend some suitable technology.

Thanks,

KC Chew
PVC products - Shah Alam, Selangor, Malaysia


 

When adhesion is concerned on metal parts, either steel, aluminum or alloys, every coating process have a suitable pretreatment on the metal parts. Regarding adhesion for plastisol coating, there is a waterbase phosphating conversion compound which is able to withstand high temperature about 280 °C prior to plastisol coating. It is supplied to the outdoor playground industries.

Andy Lim
- Kang,Selangor,Malaysia


February 10, 2009

Is there a plastisol that can be sprayed from standard painting equipment.I have been asked to apply a type 1 ,class 2 to mil-p-20689 .03 to .09 thick.

Greg Dehart
- York, South Carolina, USA


May 1, 2009

Are you opposed to using a dip process to coat your part? With plastisol, getting the desired thickness and feel may require the right combination of material (viscosity) and temperature for curing the part. Plastisol requires heat to cure. .

Bethany freeland
- Saline, Michigan


May 6, 2009

I want to make plastisol coating. But I don't know how to make a solution of plastisol . Can you help me to prepare a solution and steps of the process?

Korhan ERKAN
- Ankara , Turkey


July 21, 2009

Plastisol is a simple solution of PVC in plasticizer.
Additive like heat stabilizers and antioxidants are normally added. Colouration is done immediately before applying.
Plastisol can be "coated", "sprayed", by brush, deep coated, printed (textile screen printing).
Best way to produce it is asking to PVC supplier for a right "K" value depending on article/performance to be obtained.
Normally plastisol are available on the market "ready to use"...
Good Luck

luca tagliabue
- milano - italy


November 22, 2009

Dear Sir,
The plastisol products based on PVC powders in addition of plasticizer as a solution for PVC .The application of Plastisol coating ,as we know ,utilized on the Automotive manufacturers ,specifically in paint shops and In purpose of dampening, anti corrosion, sealing the hemmings, under body coatings,and .... Either we can consider the plastisol coating as a non-newtonian fluid which shall be controlled after production by Rheology instrument to determine the Viscosity and yield point.
Sincere salutation

pirooz pazouki
- Tehran, Iran


June 10, 2012

Q. Dear sir,
I have some questions about this coating --

PVC powder coating is a powder, like powder coating powder, but what is "plastisol"?
Is it a kind of liquid PVC? What is name of this product in the market and how to apply it? Is it the same cost as powder PVC?
What is the timing to dry and what is the temperature? Can I use it like dip coating in tank? How to coat it in dip coating? Make it warm before using it?
Thank you
ejaz

Ejaz Ahmed
- Dhaka, Bangladesh


June 13, 2012

A. Hi Ejaz.

Yes, plastisol is liquid PVC. After it dries/cures it leaves a thick, soft, PVC coating similar to a soft PVC lining material. I believe that coatings from 30 to 90 mils are customary. Thinner coatings can be sprayed; thicker coatings are dipper. There are air-dry plastisols, but I believe that the solvent based coatings are better.

A common application is the insulating coatings on plating racks. It is sometimes applied to the handles of tools like pliers.

Regards,

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Brick, New Jersey

Plasti Dip

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