Carboline Thermo-Lag 3000-SP is a two-component, 95% solids epoxy based intumescent coating for the fire protection of structural steel.

Petrochemical grade, 95% solids epoxy based intumescent designed to fireproof steelwork for up to a 4-hour fire rating, depending on the design. The recommended use for this product is fireproofing of steel beams, columns, tubes, pipes, vessel skirts, bulkheads, underdecks, and electrical raceways.

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• Features and Benefits
• Product Specification
• Drying Times
• Surface Preparation
• Application Methods
• Application Conditions
• Health and Safety

Features and Benefits

• UL listed - designs for many types of steel sections up to 4 hour fire ratings for both interior and exterior environments
• Durable finish - provides a hard, durable finish resistant to normal wear
• Thin film coating - offers an economical solution to alternative fireproofing
• Can be recoated in as little as 4 hours (between 10°C - 21°C)
• VOC compliant
• Easy repair - if damaged it can be repaired easily using material as putty
• Textured finish

Product Specification

• All values derived under controlled laboratory conditions unless otherwise noted

Drying Times

• Above cure times are based on 50% relative humidity
• Curing times are dependent upon temperature, air movement and humidity
• For optimum curing, it is recommended to apply coats at 80-160 mils (2-4 mm) wet per coat
• Material can be heated to achieve a quicker recoating and curing schedule. If maximum recoat or topcoat times are exceeded, the surface must be mechanically abraded, and solvent wiped prior to applying additional coats. Consult Rawlins on Tech - 0113 2455450 (option 2) or [email protected] for specific details

Surface Preparation

Steel

• Steel preparation before the application of an approved primer should meet SSPC-SP6 (onshore), SSPC-SP10 (offshore) with a 37-50 microns angular profile. Contact Rawlins on Tech - 0113 2455450 (option 2) or [email protected] for recommendations and specific primer requirements
• Recommended thickness range for primers used under Thermo-Lag 3000 is 75-125 microns DFT per SSPC-PA2, level 3

Galvanised Steel

• Steel preparation before priming should meet SSPC-SP7. 37-50 micron angular profile required. Prime with Carboguard 893 SG @ 75-125 microns DFT per SSPC-PA2

Non-Ferrous Metals

• Contact Rawlins on Tech - 0113 2455450 (option 2) or [email protected] for advice

Painted/Primed Structural Steel

• Existing coatings must attain a minimum 3A rating in accordance with ASTM D3359 Method A, X cut adhesion test. If acceptable, clean, and lightly abrade in accordance with SSPC-SP2 or SP3 to roughen and de-gloss the surface. If not acceptable, the coating must be removed and areas re-primed with a compatible primer. If primer coating has acceptable adhesion, but is not compatible or compatibility is unknown, a tie-coat primer can be applied as a bonding or barrier coating. Contact Rawlins for a list of approved tie-coat primers and specific primer requirements
• Primer recoat intervals may vary from the published product datasheet when using under intumescent fireproofing products. Consult Rawlins on Tech - 0113 2455450 (option 2) or [email protected] for recommended cure times before applying Carboline intumescent products

Application Methods

General

• Pre-cut all mesh before beginning application. Contact Rawlins on Tech - 0113 2455450 (option 2) or [email protected] for design details. All mesh must be kept clean and dry
• Single Component Application: Prior to spraying using single component airless equipment, the material must be preheated to a minimum of 21°C to achieve a consistent fan pattern. Apply first coat to point of mesh placement at 80-160 mils (2-4 mm). Lighter coats will achieve a smoother finish. Allow material to gel for 20-30 minutes before installing mesh and back rolling. Apply pre-cut mesh into wet coating using solvent resistant mohair rollers. Use Carboline Plasite Thinner 19, Thinner 242 E or approved equal as rolling solvent to mist down rollers to prevent them from sticking to the material. Allow material to cure for 4 hours between coats. Continue building material at 80-160 mils (2-4 mm) per coat to specified thickness. Use solvent moistened rollers to back roll material after each subsequent coat to improve finish and level surface.
• Plural Component Application: Prior to introduction into the plural component equipment, the product must be preheated to 21°C - 38°C. Perform at least two ratio checks per day and after any equipment maintenance. Apply first coat at 80-160 mils (2-4 mm). Lighter coats will achieve a smoother finish. Allow material to gel for 15 minutes before installing mesh and back rolling. Apply pre-cut mesh into wet coating using solvent resistant mohair rollers. Use Carboline Plasite Thinner 19, Thinner 242 E or approved equal as rolling solvent to mist down rollers to prevent them from sticking to the material. Allow material to cure for approximately 30 minutes (depending upon temperature) between coats. Continue building material at 80-160 mils (2-4 mm) per coat to specified thickness.
• Trowel Application: Prior to trowel application, the material must be preheated to a minimum of 21°C to achieve a workable consistency. Once material is mixed, it must be poured out of mass onto a clean table or flat working surface to extend the pot life. The material can then be divided into workable amounts. Trowel apply first coat at 80-160 mils (2-4 mm). Allow material to gel for 20-30 minutes before installing mesh and back rolling. Apply pre-cut mesh into wet coating using solvent resistant mohair rollers. Use Carboline Plasite Thinner 19, Thinner 242 E or approved equal as rolling solvent to mist down rollers to prevent them from sticking to the material. Allow material to cure for 4 hours between coats. Continue building material at 80-160 mils (2-4 mm) per coat to specified thickness.
• Always use clean solvent for back rolling. Avoid using excessive solvent when back rolling as this can lead to solvent entrapment and lengthen the cure time of the material. Use solvent moistened rollers to back roll material after each subsequent coat to improve finish and level surface if required. Lighter coats will achieve a smoother finish. Contact Rawlins or refer to the product application manual for more detailed information.

Application Rates

At an ambient temperature of 21°C, the following application rates are applicable:

• 80-160 mils (2-4 mm) per coat (wet)
• 4 hour recoat time between coats
• 2 coats per day

Wet Film Thickness

• Frequent thickness measurements with a wet film gauge are recommended during the application process to ensure uniform thickness.

Dry Film Thickness

• Final thickness must be measured using an electronic dry film thickness gauge. For method of thickness determination and tolerances refer to: AWCI Technical Manual 12-B (Standard Practice for the Testing and Inspection of Field Applied Thin Film Intumescent Fire Resistive Materials).

Maintenance

• If coating becomes damaged, rebuild required thickness by spray or trowel. When dry, smooth and finish with approved topcoat to match. Damaged areas must be abraded back to a firm edge by sanding or scraping. The topcoat should be abraded back by 1" (25.4 mm) from the damaged area. The surface must be clean and dry before re-applying Thermo-Lag® 3000-SP. The coating shall then be built back to the original thickness. If the mesh is damaged, it must be cut out and replaced as well. Allow to cure and then overcoat with the specified topcoat or system.

Application Conditions

• Air and substrate temperature must be at least 5°C and rising
• Steel surface temperature should be a minimum of 3°C above the dew point
• The maximum humidity is 85%
• Area must be protected from rain or running water during application until material is cured and topcoated

Health and Safety

Clean Up

• Pump, mixer, hose, and gun should be cleaned with Carboline Plasite Thinner 19, Thinner 76 or Thinner 242 E at least once every 4 hours at 21°C, and more often at higher temperatures
• After each use or any shut down, the pump, mixer, hopper and gun must be completely flushed with solvent
• After flushing pump, remove hopper and bottom foot of pump to clean lower ball check valve
• Also remove and hand clean gun, tips and tip housing.
• The hopper and mixing paddle must be kept clean continuously during application to prevent cured material from falling into the foot of the pump

Safety

• Follow all safety precautions on the Thermo-Lag® 3000-SP safety data sheet
• It is recommended that personal protective equipment be worn, including spray suits, gloves, eye protection and respirators when applying Thermo-Lag® 3000-SP

Overspray

• All adjacent and finished surfaces shall be protected from damage and overspray

Ventilation

• In enclosed areas, ventilation shall not be less than 4 complete air exchanges per hour until the material is cured

• Refer to the product data sheet and safety data sheet in the attachments section above for further details.