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Carbothane 133 HB by Carboline

Carbothane 133 HB High Build Polyurethane Topcoat

by Carboline
$308.20 - $1,721.82
$308.20
$308.20 - $1,721.82
$308.20

Carbothane 133 HB is a high-build, low-sheen aliphatic polyurethane finish coat engineered by Carboline for superior resistance to corrosion, chemicals, abrasion, and weathering in industrial, atmospheric, and heavy-duty environments.

This tough topcoat offers excellent color and gloss retention, high-build capability for efficient two-coat systems, outstanding performance in mild to aggressive conditions, and very good durability when applied over compatible Carboline primers and intermediates—ideal for steel structures, pipelines, tanks, bridges, equipment, and infrastructure needing long-term protection and aesthetics.

Carbothane 133 HB PDS >
Finish: Low Sheen - Satin 
Theoretical Coverage: approx. 150-350 SF/Gal depending on DFT (refer to PDS for exact rates)

VIEW THE ENTIRE LINE OF CARBOLINE COATINGS HERE>

Key Features:

  • High Build & Low Sheen Finish: Allows thicker films in fewer coats for application efficiency and a uniform, attractive appearance.
  • Excellent Resistance Properties: Superior protection against corrosion, chemicals, abrasion, and weathering in mild to aggressive industrial environments.
  • Outstanding Weathering Performance: Very good color and gloss retention over time, with broad color availability for aesthetic and functional needs.

Common Industry Applications:

  • Industrial & Petrochemical: Topcoat for tanks, vessels, piping, structures, and equipment in refineries, plants, and facilities requiring abrasion and chemical resistance.
  • Pipelines & Infrastructure: Durable finish for pipelines, bridges, highways, and treatment facilities in atmospheric exposure with high-build protection.
  • General Maintenance & Heavy-Duty Protection: Steel structures, equipment, and surfaces in aggressive industrial/outdoor settings needing tough, weather-resistant polyurethane topcoats.

Carbothane 133 HB is a TWO-COMPONENT SYSTEM (PART A & PART B).

Product type: High-Build Aliphatic Polyurethane Finish Coat.
Finish: Satin 
Applied via: Airless Spray, Conventional Spray, Brush, or Roller

Shipping & Delivery: Carboline orders typically ship within 1-2 business days of order receipt. 
Most orders are received within a week.
Expedited shipping NOT available on most orders.

Looking for a high-build low-sheen polyurethane topcoat?
Contact our customer support today to discuss your project:
(800) 567-5358

Size: .8Gal
Color: White (1864)
Coverage Calculator

Compatible Thinners — Carbothane 133 HB

Thinner Use Max Rate
Thinner 25 › Spray 11 oz/gal (9%)
Thinner 25 › Brush & roller 18 oz/gal (14%)
Thinner 214 Spray or brush & roller 6 oz/gal
Thinner 236E When minimizing HAP and VOC emissions is required Per PDS
Thinner 2 or Acetone Cleanup only —

Thinner 25 is the primary thinner for Carbothane 133 HB — up to 11 oz/gal for spray and 18 oz/gal for brush and roller. Thinner 214 may also be used up to 6 oz/gal for either method. Use Thinner 236E when HAP and VOC reduction is required. Note: thinning increases VOC content — verify local limits before thinning. Use of unauthorized thinners may adversely affect film performance and void the product warranty. Source: Carbothane 133 HB PDS (June 2021, doc 0840).

Recommended Coating Systems

Two-Coat System — Direct to Inorganic Zinc ★ Signature System

133 HB's defining capability — apply direct to an inorganic zinc primer using a mist-coat technique, eliminating the epoxy intermediate entirely. The high-build formulation (3–5 mils DFT) provides the extra barrier protection that makes this possible, reducing coat count and labor without sacrificing performance. PDS test data: ASTM G26 Weatherometer — no blistering, rusting, or cracking after 3,500 hours; ASTM B117 salt fog — no rusting or blistering on plane or scribe after 2,000 hours; ASTM D4585 humidity — no rusting or blistering after 3,000 hours — all over IOZ + 133 HB.

Primer Carbozinc 11 Inorganic zinc silicate · cathodic protection · mist coat required
→
Topcoat Carbothane 133 HB 3–5 mils DFT · satin finish · eliminates epoxy intermediate
Two-Coat System — Organic Zinc + 133 HB ★ Maximum Salt Fog Performance

When an organic zinc-rich primer is specified, this 2-coat system delivers the strongest corrosion resistance data in the 133 HB performance table. PDS test data: ASTM B117 salt fog — no rusting or blistering on plane or scribe after 4,000 hours over OZ + 133 HB — the highest salt fog result in the PDS. Apply 3–5 mils DFT.

Primer Carbozinc 859 Organic zinc-rich epoxy · faster cure than IOZ
→
Topcoat Carbothane 133 HB 3–5 mils DFT · 4,000 hr salt fog validated
Three-Coat System — Zinc + Epoxy Intermediate + 133 HB

The standard 3-coat system for steel in aggressive industrial, chemical processing, bridge, and infrastructure environments where maximum protection is specified. Epoxy intermediate provides additional barrier and build between the zinc primer and 133 HB finish. PDS test data: ASTM D1735 water fog — no rusting or blistering after 8,600 hours over epoxy + 133 HB; ASTM G53 QUV — color change less than 2 McAdam units, no blistering or chalking after 2,500 hours; graffiti resistance confirmed over epoxy + 133 HB system.

Primer Carbozinc 11 Inorganic zinc silicate · 2–3 mils DFT
→
Intermediate Carboguard 890 Cycloaliphatic amine epoxy · 4–6 mils DFT
→
Topcoat Carbothane 133 HB 3–5 mils DFT · satin finish

Systems shown are consistent with performance test systems documented in the Carbothane 133 HB PDS and Product Flyer. 133 HB applies direct to inorganic zinc using a mist-coat technique per PDS. Always confirm system selection with Carboline Technical Service for your specific exposure, substrate, and specification. Source: Carbothane 133 HB PDS (June 2021, doc 0840) and Product Flyer.

Frequently Purchased Together

Carbozinc 11 inorganic zinc silicate primer
Carbozinc 11
Inorganic zinc silicate primer — the base coat for 133 HB's signature 2-coat system. Apply 133 HB direct using a mist-coat technique; no epoxy intermediate required.
Contact for Pricing
Shop Now
Carboguard 890 cycloaliphatic amine epoxy intermediate
Carboguard 890
Cycloaliphatic amine epoxy — intermediate coat in 3-coat systems with 133 HB. PDS validated: no rusting or blistering after 8,600 hours water fog over epoxy + 133 HB.
From $419.48
Shop Now
Carboline Thinner No. 25
Carboline Thinner No. 25
Primary thinner for Carbothane 133 HB — up to 11 oz/gal for spray, up to 18 oz/gal for brush and roller application.
$137.53 / gal
Shop Now
Carboline Additive 101 cold cure accelerator
Carboline Additive 101
Cold-cure accelerator for 133 HB — accelerates cure 25–40% and enables application down to 20°F (-7°C). Reduces pot life approximately 40–50%. Use 1.0–2.0 oz per mixed gallon.
$107.25
Shop Now

Carbothane 133 HB High Build Polyurethane Topcoat by Carboline

Product Specs — Carbothane 133 HB

Carbothane 133 HB — High-Build Aliphatic Acrylic-Polyester Polyurethane Topcoat by Carboline.
A high-build, low-sheen polyurethane finish combining the weathering resistance of an acrylic binder with the chemical resistance and toughness of a polyester. Outstanding performance in both mild and aggressive environments. Its high build eliminates the epoxy intermediate coat for many applications, and it applies directly to inorganic zinc primers with a mist coat. Suitable for bridge and highway, industrial, OEM, food and beverage, oil and gas, and architectural projects. VOC compliant to current AIM regulations.

✓ High-Build (3–5 mils per coat)  •  ✓ Direct to Inorganic Zinc (mist coat)  •  ✓ Indefinite Recoatability  •  ✓ Spray, Brush, or Roller  •  ✓ VOC Compliant (AIM)

✏️ Need a project quote? Request Online

📞 Questions? Call (800) 567-5358 — Mon–Fri 8AM–5PM EST

Carbothane 133 HB by Carboline

Carbothane 133 HB high-build polyurethane topcoat by Carboline — 0.875-gallon and 5-gallon kits
Carbothane 133 HB — 0.875-Gal & 5-Gal Kits

Shipping Map — Carboline Delivery Timing

US regional warehouse map showing estimated shipping transit times for Carboline product orders from Material Warehouse 🔍 Click to enlarge
Typical transit times vary by destination zone. Click map to enlarge.

Shipping Time

Call (800) 567-5358 for pricing and logistics questions.

Carboline orders ship from regional warehouses nearest to your location, with full product stock maintained at each facility.

Most orders ship within 2–3 business days of order placement. Transit times shown on the map are typical but not guaranteed.

Available sizes: 0.875-gallon kit (11 lbs)  •  5-gallon kit (64 lbs)

Coverage Rates & Technical Specifications

Recommended DFT: 3–5 mils per coat. 57% volume solids. Do not exceed 7 mils DFT per coat. Allow for loss in mixing and application.

PropertyValueNotes
Generic TypeAliphatic Acrylic-Polyester PolyurethaneModified urethane — weathering + chemical resistance
FinishSatinMinimizes substrate imperfections; easy touch-up
Volume Solids57% ±2%—
Recommended DFT3–5 mils (76–127 µm) per coatMax 7 mils per coat not recommended
Coverage @ 1 mil914 ft²/gal (22.4 m²/l)Theoretical — allow for loss
Coverage @ 3 mils305 ft²/gal (7.5 m²/l)Theoretical — typical specification DFT
Coverage @ 5 mils183 ft²/gal (4.5 m²/l)Theoretical — maximum recommended DFT
Mix Ratio6:1 (Part A to Part B)Do not mix partial kits
Pot Life4 hours at 75°F (24°C)Less at higher temps · moisture causes gellation
Dry to Handle @ 75°F5 hoursBased on 3.0–5.0 mil DFT
Dry to Recoat @ 75°F5 hoursMaximum recoat time is indefinite
Min Application Temp40°F (4°C)Additive 101 extends cure to 20°F (–7°C)
Max Humidity90% RHMoisture exposure causes gloss loss / microbubbling
Dry Temp. Resistance300°F (149°C) continuousSome discoloration/gloss loss at elevated temps
VOC (As Supplied)3.2 lbs/gal (383 g/l)AIM compliant · see VOC table for thinned values
Application MethodsSpray, Brush, RollerBrush touch-up only; roller: medium-nap synthetic w/ phenolic core
Thinning (Spray)Up to 11 oz/gal Thinner 25Thinner 214 up to 6 oz/gal; Thinner 236E for low HAPs/VOC
Thinning (Roller)Up to 18 oz/gal Thinner 25Results in 3.7 lbs/gal (449 g/l) VOC
CleanupThinner 2 or Acetone—
Shelf Life — Part AMin. 36 months at 75°FUnopened, stored per conditions below
Shelf Life — Part BMin. 24 months at 75°FUnopened, stored per conditions below
StorageIndoors · 40–110°F · 0–90% RHNot affected by excursions to 10°F up to 14 days
Flash Point — Part A95°F (35°C)Setaflash
Flash Point — Part B91°F (33°C)Setaflash
Kit Sizes0.875-gal (11 lbs) · 5-gal (64 lbs)—

Source: Carboline Carbothane 133 HB Product Data Sheet (June 2021, doc 0840). Coverage rates are theoretical — actual yield varies with surface profile, temperature, and application method.

Curing Schedule

Times based on 3.0–5.0 mil DFT. Higher film thickness, insufficient ventilation, or cooler temperatures extend cure times. Maximum recoat time is indefinite.

Surface Temp.Dry to HandleDry to RecoatFinal Cure
40°F (4°C)20 Hours20 Hours28 Days
50°F (10°C)12 Hours12 Hours14 Days
75°F (24°C)5 Hours5 Hours7 Days
90°F (32°C)1 Hour1 Hour4 Days

Additive 101: Add 1.0–2.0 oz per mixed gallon (max 6 oz per 5-gal kit) to accelerate cure 25–40% and extend cure capability down to 20°F (–7°C). Reduces pot life by approximately 40–50%.

VOC Values by Thinner

Thinning ConditionVOC
As Supplied (no thinner)3.2 lbs/gal (383 g/l)
Thinner 25 @ 11 oz/gal (spray)3.5 lbs/gal (420 g/l)
Thinner 25 @ 18 oz/gal (roller)3.7 lbs/gal (449 g/l)
Thinner 214 @ up to 6 oz/gal3.3 lbs/gal (403 g/l)
Thinner 2413.5 lbs/gal (423 g/l)
Thinner 236E (low HAPs/VOC)Use per Carboline guidance
Additive 101 @ 1.5 oz/gal+0.08 lbs/gal (+10 g/l)

Nominal values — may vary slightly with color. VOC compliant to current AIM regulations. Check local regulations before specifying.

Performance Test Data

All test data generated under laboratory conditions. Field results may vary.

Test MethodSystem TestedResult
ASTM B117 Salt FogBlasted Steel · 1 ct. OZ · 1 ct. 133 HBNo rusting or blistering on plane or scribe — 4,000 hours
ASTM B117 Salt FogBlasted Steel · 1 ct. IOZ · 1 ct. 133 HBNo rusting or blistering on plane or scribe — 2,000 hours
ASTM D1735 Water FogBlasted Steel · 1 ct. Epoxy · 1 ct. 133 HBNo rusting or blistering after 8,600 hours
ASTM D4585 HumidityBlasted Steel · 1 ct. IOZ · 1 ct. 133 HBNo rusting or blistering after 3,000 hours
ASTM G26 WeatherometerBlasted Steel · 1 ct. IOZ · 1 ct. 133 HBNo blistering, rusting, or cracking after 3,500 hours
ASTM G53 QUV (UVA 340, 2,500 hr)Blasted Steel · 1 ct. Epoxy · 1 ct. 133 HBColor change <2 McAdam units; no blistering, rusting, cracking, or chalking
ASTM D5894 QUV A Prohesion1 ct. 133 HBNo effect on plane area; 78% gloss retention after 1,008 hours wet/dry salt fog cycle
ASTM D4213 Scrub Resistance1 ct. 133 HB0.0027 microliters erosion rate after 100 cycles with abrasive scrub medium
Graffiti ResistanceBlasted Steel · 1 ct. Epoxy · 1 ct. 133 HBAll markings removed by solvent: shoe polish, Sharpie, crayon, lipstick, acrylic/alkyd/epoxy spray paint

Test reports and additional data available upon request from Carboline Technical Service.

Good to Know Before You Buy

⚠️ Application Notes & Pro Tips
  1. Mist coat required when applying over inorganic zinc. Apply a thin diluted mist coat first, allow brief flash-off, then apply the full wet coat. Skipping the mist coat causes outgassing from the zinc-rich film, resulting in bubbling and pinholes in the finish.
  2. Do not mix partial kits. The 6:1 ratio (Part A to Part B) is factory-calibrated. Partial-kit mixing results in an off-ratio film with compromised properties and shortened pot life.
  3. Moisture contamination during pot life causes gellation. Keep the mixed material covered and away from rain and dew. A gelled pot is unusable — discard and start fresh.
  4. Pot life is 4 hours at 75°F — plan batch sizes accordingly. Pot life drops significantly above 90°F. Mix smaller batches in hot weather to avoid waste.
  5. Indefinite recoat window. No maximum recoat time. If the surface passes the Thinner 25 tack test (slight tack = suitable), you can recoat without abrading regardless of elapsed time.
  6. Additive 101 extends cold-weather cure to 20°F (–7°C). Add at 1.0–2.0 oz per mixed gallon. Note that Additive 101 reduces pot life by approximately 40–50% — mix smaller batches when using it.
  7. Roller application typically requires multiple coats to reach DFT. Use a medium-nap synthetic roller cover with phenolic core. Avoid excessive re-rolling and tie in within 10 minutes at 75°F for best film appearance.
  8. Graffiti resistant — a practical advantage for bridge and transit applications. Tested against Sharpie, crayon, shoe polish, lipstick, and spray cans of acrylic, alkyd, and epoxy paint — all removed by solvent wipe.

Frequently Asked Questions — Carbothane 133 HB

What is the coverage rate for Carbothane 133 HB?
Carbothane 133 HB covers 305 ft²/gal at 3.0 mils DFT and 183 ft²/gal at 5.0 mils DFT (theoretical, based on 57% volume solids). The recommended dry film thickness is 3–5 mils per coat. Do not exceed 7 mils DFT per coat. Allow for application loss in all coverage estimates.
Can Carbothane 133 HB be applied directly over inorganic zinc primers?
Yes — Carbothane 133 HB can be applied directly to inorganic zinc primers using a mist-coat technique. Apply a thin diluted mist coat first, allow brief flash-off, then apply the full wet coat. This eliminates the epoxy intermediate for many applications, reducing system cost and labor while delivering equivalent protection. The IOZ + 133 HB system demonstrated no rusting or blistering after 2,000 hours in ASTM B117 salt fog.
What is the mix ratio and pot life of Carbothane 133 HB?
Carbothane 133 HB uses a 6:1 mix ratio (Part A to Part B). Power mix Part A separately, then combine with Part B and power mix again. Do not mix partial kits. Pot life is 4 hours at 75°F (24°C) — shorter at higher temperatures. Moisture contamination will shorten pot life and cause gellation; protect the mixed material from rain and dew.
What salt spray and weathering performance has Carbothane 133 HB demonstrated?
Over an organic zinc primer: no rusting or blistering after 4,000 hours per ASTM B117 salt fog. Over an inorganic zinc primer: no rusting or blistering after 2,000 hours. Over epoxy: no rusting or blistering after 8,600 hours per ASTM D1735 water fog. No rusting or blistering over IOZ after 3,000 hours in ASTM D4585 humidity testing. No blistering, rusting, or cracking after 3,500 hours in ASTM G26 Weatherometer.
What is the maximum recoat time for Carbothane 133 HB?
Carbothane 133 HB has indefinite recoatability — there is no maximum recoat window. The surface must be clean and dry. As a practical test, wipe the surface with Thinner 25: if the film shows a slight tack, it is suitable for recoating without extensive surface preparation such as abrading.
Can Carbothane 133 HB be applied by brush or roller?
Yes — Carbothane 133 HB can be applied by spray, brush, or roller. For roller application, use a medium-nap synthetic roller cover with phenolic core and thin with up to 18 oz/gal of Thinner 25. Avoid excessive re-rolling and tie in within 10 minutes at 75°F. Multiple coats may be required to reach the 3–5 mil recommended DFT by roller. Brush is for touch-up only.
How does Carbothane 133 HB differ from 133 LH and 133 LV?
133 HB is the standard high-build, AIM VOC-compliant version with satin finish and roller capability — the best all-around choice for bridge, highway, and general industrial applications. 133 LH offers enhanced chemical and solvent resistance, making it the right choice for chemical processing, oil and gas, or environments with chemical splash. 133 LV is the lowest-VOC version at 211 g/l (1.76 lbs/gal) per EPA Method 24, designed for VOC-restricted jurisdictions where standard AIM compliance is insufficient.

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