Carboline Plasite 4550


Carboline Plasite 4550 is a two-component, 100% solids, reinforced, premium novolac epoxy coating for internal tank lining. It is resistant to a broad range of chemicals such as fuels, salts, alkalis, strong inorganic acids, some solvents, sour crude oil and 98% sulfuric acid.

  • High Impact Resistance
  • Superior adhesion to metal substrates and concrete
  • Outstanding adhesion to stainless steel, even with low blast profiles
  • Can be applied in temperatures as low as 1.7°C (35°F)

This product is only available as PRICE ON APPLICATION - For more information and to place an order please contact us on 0113 2455450 or email [email protected].

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Carboline Plasite 4550 is a two-component, 100% solids, reinforced, premium novolac epoxy coating for internal tank lining. It is resistant to a broad range of chemicals such as fuels, salts, alkalis, strong inorganic acids, some solvents, sour crude oil and 98% sulfuric acid.

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Features and Benefits

  • High Impact Resistance
  • Superior adhesion to metal substrates and concrete
  • Outstanding adhesion to stainless steel, even with low blast profiles
  • Well suited to protect alloy steels typically used to wet FGD systems where pitting and crevice
    corrosion often occur
  • Fast cure-to-service; depending upon application can be placed into service within 36 hours
  • Minimal blushing characteristics
  • Can be applied in temperatures as low as 1.7°C 
  • Can be applied as a one-coat system
  • Tested and approved for crude oil storage and transport up to 177°C 
  • Superior thermal shock resistance from -40-177°C 
  • Complies with the API RP 652 definition of a reinforced liner

Product Specification

Technical Data
Carboline Plasite 4550
Volume Solids: By Volume 100% +/- 2%
Theoretical Coverage Rate:

39.4 m²/l at 25 microns 

2.0 m²/l at 500 microns 

1.3 m²/l at 750 microns 

Allow for loss in mixing and application
Dry Film Thickness:

Most applications are applied in a single coat at 500-750 microns

May be applied at heavier thicknesses up to 1500 microns as needed or specified

VOC Values: As Supplied: 0 g/l
Dry Temp. Resistance:

Continuous: 149°C 

Non-Continuous: 204°C 

Flash Point: Part A: 94°C  Part B: 106°C 
Shelf Life:

The film build (per coat) will decrease with age of either part A or B as follows but the cure mechanism and performance is not affected

3 months or less: Over 1524 microns is typical 3-6 months: 762-1270 microns is typical

6 months or older: Can be less than 762 microns

Follow intercoat preparation requirements when applying multiple coats

Storage Temperature and Humidity:


For 24-48 hours just prior to use narrow the storage temperature to 21-29 °C  to facilitate ease of mixing

Drying Times

Curing Schedule
Surface Temp Cure for Most Immersion Services Dry to Touch Firm
2°C  5 Days 8 Hours 16 Hours
24°C  5 Days 6 Hours 8 Hours

  • orce curing (elevated temperature) may be desirable in certain circumstances and can improve the performance with particularly aggressive exposures. Check with Rawlins on Tech - 0113 2455450 (option 2) or [email protected] for more information
  • Epoxies may form an amine blush under some conditions. Blush must be removed before coating or using in some services

Surface Preparation


  • Immersion: Prepare by abrasive blasting to a minimum near White Metal Finish (NACE NO 2, SSPC-SP10) with a minimum 3 mil (75 micron) dense, sharp anchor profile
  • For special applications involving stainless steel used in wet FGD applications a minimum of 2 mils (50 microns) dense angular anchor profile is acceptable

Concrete or CMU

  • Clean, dry and remove all loose, unsound concrete
  • Do not apply coating unless concrete has cured at least 28 days @ 21°C or equivalent
  • Prepare surfaces in accordance with ASTM D4258 Surface Cleaning of Concrete and ASTM D4259 Abrading Concrete
  • Voids in concrete may require filling and/or surfacing

Application Methods

Product Information
Mixing: Mix each component separately to a smooth, uniform consistency. Any settling in the container must be thoroughly scraped and re-dispersed. Use a Jiffy type mixer and avoid plunging it up and down in the bucket, which can fold air into the resin causing bubbles to form in the coating after it has been applied.

For touch-up only:

Jiffy type mixers are recommended for all mixing and stirring. Avoid plunging the mixer up and down in the bucket. This can fold air into the resin which may cause bubbles to form in the coating after it has been applied. Individually stir separately Part A and Part B to a smooth uniform consistency and colour. Any sediment in the container must be thoroughly scraped up and re-dispersed.


Thinning not normally required

Use of thinners other than those supplied or recommended by Carboline may adversely affect product performance and void product warranty, whether expressed or implied

Ratio: A:B 4:1
Pot Life:

 2°C (35 °F): 30-40 minutes

 24°C (75°F): 15-25 minutes

Application Procedure:

Use a fixed ratio (4:1 by volume) plural component spray rig such as Graco King Hydro-Cat or equal with heated hoppers, heated hoses to a mixer manifold through a static mixer to a 50 whip hose followed by a silver gun, Binks 1M or equal, utilizing self-cleaning reverse "a" tips from 0.017" to 0.035". 


The 'A" side should be at a minimum of 4°C (110°F) and the "B" side at 90- 32-37°C (100°F). This will ensure proper spraying of Plasite 4550. Take care to prevent mixed material from setting up in your hoses. For best results keep hoses as short as possible, purge them immediately if work is interrupted, keep them out of direct sunlight and insulated from hot surfaces.

Lining Repair:

Before any touch up or recoat material can be applied the first coat must be properly prepared for intercoat adhesion. The first coat must be cured firm to touch. Coating on floors must be able to support foot traffic. Scrub the first coat with soap and water and thoroughly rinse and dry.

If the first coat cures more than 24 hours, sand or mechanically abrade the surface after scrubbing it down. Any surface to be touched up or recoated should be protected. When the recoat material is applied the surface must be dry and free of all dirt, dust, debris, oil, grease or other contamination.

Airless Spray:

This product requires a heated plural component airless spray proportioner

Immediately before applying spray coat, stripe all welds and edges to assure adequate protection of these areas

Adjust pressure to 50-70 lbs and open the valves at the manifold and purge materials at the spray gun

Attach spray tip and begin to spray

Dependent upon tip size, each pass will be 200-350 microns per pass

Apply material to specified thickness (for example, tank lining 875-1000 microns, structural steel 375-500 microns)

Apply criss-cross multi-passes, moving gun at a fairly rapid rate and maintaining a wet-appearing film

Use a wet film gauge to monitor film build

Application Conditions

Product Conditions
Condition Surface Ambient Humidity
Minimum 2°C   2°C  0%
Maximum 52°C   43°C  85%

  • Do not apply material when temperature will fall within 3°C of the dew point
  • Material Temperatures: For proper spraying, Part A should be a minimum of 43°C and Part B 32-37°C
  • Application and curing times are dependent upon ambient conditions

Health and Safety

Clean Up


  • Read and follow all caution statements on this product data sheet and on the safety data sheets for this product and use personal protective equipment as directed
  • Employ normal workmanlike safety precautions


  • When used in enclosed areas, thorough air circulation must be used during and after application until the coating is cured.
  • The ventilation system should be capable of preventing the solvent vapor concentration from reaching the lower explosion limit for the solvents used
  • User should test and monitor exposure levels to ensure all personnel are below guidelines
  • If not sure or if not able to monitor levels, use MSHA/NIOSH approved supplied air respirator
  • Refer to the product data sheet and safety data sheet in the attachments section above for further details.
Product Details

Data sheet

For Use On
Steel, Concrete
Application Method
Standard / Ready Mixed
Single, Two or Three Pack
Mixing Ratio
A:B 4:1
604 ft²/gal at 1.0 mils (39.4 m²/l at 25 microns) - 80 ft²/gal at 20.0 mils (2.0 m²/l at 500 microns) - 53 ft²/gal at 30.0 mils (1.3 m²/l at 750 microns)
Recommended Thinner/Cleaner
Carboline Plasite Thinner 71 or Carboline Thinner 2
Max. Application Temperature
Surface: 52°C (125°F) - Ambient: 43°C (110°F) - Humidity: 85%
Min. Application Temperature
Surface: 2°C (35°F) - Ambient: 2°C (35°F) - Humidity: 0%
Solids by Volume
100% +/- 2%
As Supplied: 0 g/L
Touch Dry
2°C (35°F): 16 hours - 24°C (75°F): 8 Hours
UN Number (Activator)
UN Number (Base)
Pot Life
2°C (35 °F): 30-40 minutes - 24°C (75°F): 15-25 minutes

Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

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