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Carboline Carboxane 2100 BR - Bio-Resistant Epoxy Polysiloxane Topcoat

Carboxane 2100 BR - Bio-Resistant Epoxy Polysiloxane Topcoat

by Carboline
$748.48 - $3,365.17
$748.48
$748.48 - $3,365.17
$748.48

Carboxane 2100 BR is an isocyanate-free, ultra-durable, fungal-resistant modified siloxane hybrid topcoat engineered by Carboline to combat Baudoinia and other black fungal growth commonly found in environments with ethanol and alcohol vapors. This fast-cure, high-solids coating delivers outstanding color and gloss retention that exceeds many acrylic aliphatic polyurethanes — while providing excellent corrosion protection that can be applied direct to metal (DTM). Ideal for distilleries, wineries, ethanol storage tanks, and bakeries, Carboxane 2100 BR keeps substrates looking clean and protected for years.

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Key Features:

  • Pronounced Fungal & Bacterial Growth Inhibition: Exhibits broad-spectrum growth inhibiting activity against Baudoinia and other bacteria and fungi thriving in ethanol and alcohol vapor environments — field tested for over 2½ years of resistance.
  • Isocyanate Free: Safer formulation eliminates isocyanate hazards without sacrificing performance or durability.
  • Fast Cure with Good Pot Life: Dry to the touch in as little as 1 hour at 90°F (32°C), with a 5-hour pot life at 75°F (23°C) — significantly speeds up project timelines.
  • Excellent Weathering Performance: Meets SSPC Coating Spec. No. 36 Level 3A — the highest level for polyurethanes — for long-lasting exterior color and gloss retention.
  • Direct to Metal (DTM) Application: Can be applied in 1–2 coats instead of the typical 2–3 coat systems, saving significant time, labor, and money.
  • Excellent Corrosion Protection: Meets ISO 12944-6 C3 High and C4 Medium ratings when applied as a single coat DTM.
  • Low VOC: Less than 100 g/l as mixed — meets the most stringent field-applied coating VOC regulations.

Common Industry Applications:

  • Ethanol Storage Tank Exteriors: Resists Baudoinia black fungal growth on tank shells and roofs exposed to ethanol and alcohol vapors.
  • Distilleries & Spirits Maturation Facilities: Protects structural and tank exteriors in alcohol-vapor-rich environments where black mold is a persistent problem.
  • Wineries: Provides long-term exterior protection and fungal resistance on tanks and facility structures in winery environments.
  • Bakeries: Guards against biological growth on exterior surfaces in yeast- and fermentation-adjacent environments.
  • General Industrial & Commercial Exteriors: Suitable for urban to light industrial exposures (C1–C4 per ISO 12944) — steel structures, equipment, and facades requiring durable, low-maintenance finishes.

Carboxane 2100 BR is SOLD IN 1-GALLON & 5-GALLON KITS, INCLUDING PARTS A & B.

Product type: Fungal Resistant Modified Siloxane Hybrid
Carboxane 2100 BR has a Gloss finish
Available colors: 1864 White, C703 Grey, C705 Light Grey (limited additional colors available on request)
Applied via Airless Spray, Brush, or Roller
Mixing: 4:1 Ratio Part A to Part B
Dry Film Thickness: 3–7 mils (76–178 microns) per coat

Looking for a bio-resistant topcoat for your project? Contact us today to discuss your project:
(800) 567-5358

Size: 1-gal
Color: White (1864)
Coverage Calculator

Compatible Thinners — Carboxane 2100 BR

Thinner Use Max Rate VOC Impact
Thinner 236 E Spray or brush/roller — preferred when VOC compliance is required 10% (13 oz/gal) Maintains 90 g/l — stays below 100 g/l limit
Thinner 10 Spray or brush/roller — only when higher VOC is acceptable 8% (10 oz/gal) Raises VOC to 148 g/l — exceeds 100 g/l limit
Thinner 2, Thinner 225 E, or Acetone Cleanup only — —

Thinning is not normally required for Carboxane 2100 BR — this is a high-solids (85% by volume) coating. When thinning is needed, Thinner 236 E is the preferred choice to maintain VOC compliance below 100 g/l. Thinner 10 is only acceptable where a higher VOC is permitted by local regulations. Use of unauthorized thinners may adversely affect film performance. Source: Carboline Carboxane 2100 BR PDS (August 2022, doc 1358).

Recommended Coating Systems

Single-Coat Direct-to-Metal (DTM) System ★ Signature System

Carboxane 2100 BR's most efficient system — apply in one coat at 5 mils minimum DFT directly over properly blasted steel (SSPC-SP6, 1.5–2.5 mil profile). Delivers ISO 12944-6 C3 High and C4 Medium corrosion protection with full bio-resistance in a single pass. Reduces application time, labor, and cost significantly vs. conventional 2–3 coat systems.

Single Coat — DTM Carboxane 2100 BR 5 mils DFT minimum · SSPC-SP6 surface prep · ISO 12944 C3 High / C4 Medium
Two-Coat System — Epoxy Primer + Bio-Resistant Topcoat

When improved corrosion protection beyond C4 is required, or when the substrate warrants a dedicated primer, pair Carboxane 2100 BR over an approved epoxy primer at a minimum of 5 mils DFT finish coat. Also the recommended approach when applying over previously coated surfaces that have been properly prepared — eliminating costly full removal.

Primer Carboguard 890 Cycloaliphatic amine epoxy · 4–6 mils DFT
→
Topcoat Carboxane 2100 BR 5 mils DFT minimum · gloss bio-resistant finish
Two-Coat System — Zinc-Rich Primer + Bio-Resistant Topcoat

For maximum corrosion protection in C4 and above exposures, apply Carboxane 2100 BR over an inorganic or organic zinc-rich primer. Compatible with both per the PDS. Minimum 5 mils DFT finish coat delivers cathodic zinc protection plus full bio-resistance and weathering performance of the siloxane hybrid topcoat.

Primer Carbozinc 11 Inorganic zinc silicate · 2–3 mils DFT
→
Topcoat Carboxane 2100 BR 5 mils DFT minimum · gloss bio-resistant finish
Three-Coat System — Severe Marine / Offshore Exposures

For severe marine environments including offshore structures, a 3-coat system is recommended per the PDS. Carboxane 2100 BR serves as the finish coat at a minimum of 3 mils DFT over a primer and intermediate coat, providing maximum atmospheric corrosion resistance in the most demanding exposures.

Primer Carbozinc 11 Inorganic zinc silicate · 2–3 mils DFT
→
Intermediate Carboguard 890 Epoxy intermediate · 4–6 mils DFT
→
Topcoat Carboxane 2100 BR 3 mils DFT minimum · gloss bio-resistant finish

Systems shown are consistent with guidance in the Carboxane 2100 BR PDS. Always confirm primer selection with Carboline Technical Service for your specific exposure and substrate. Source: Carboline Carboxane 2100 BR PDS (August 2022, doc 1358) and Product Flyer.

Frequently Purchased Together

Carboguard 890 cycloaliphatic amine epoxy primer
Carboguard 890
Cycloaliphatic amine epoxy primer/intermediate — recommended under Carboxane 2100 BR for 2-coat and 3-coat systems requiring enhanced corrosion protection.
From $419.48
Shop Now
Carbozinc 11 inorganic zinc silicate primer
Carbozinc 11
Inorganic zinc silicate primer — recommended zinc-rich base coat under Carboxane 2100 BR for maximum cathodic corrosion protection in C4+ exposures.
Contact for Pricing
Shop Now
Carbozinc 859 organic zinc-rich epoxy primer
Carbozinc 859
Organic zinc-rich epoxy primer — compatible alternative to Carbozinc 11 under Carboxane 2100 BR; fast cure and low VOC for shop and field applications.
Contact for Pricing
Shop Now
Carboline Thinner 236 E
Carboline Thinner 236 E
Preferred thinner for Carboxane 2100 BR — maintains VOC below 100 g/l when thinning is needed (up to 13 oz/gal max). Call us to order.
Contact for Pricing
(800) 567-5358

Carboxane 2100 BR Bio-Resistant Fungal Resistant Siloxane Topcoat by Carboline

Product Specs — Carboxane 2100 BR

Carboxane 2100 BR — Bio-Resistant Fungal Resistant Modified Siloxane Hybrid Topcoat by Carboline.
An isocyanate-free, ultra-durable, fast-cure corrosion-resistant coating with pronounced growth inhibition against baudoinia and other bacteria and fungi common in ethanol and alcohol vapor environments. 85% solids by volume. Less than 100 g/l VOC. Color and gloss retention exceeds many acrylic aliphatic polyurethanes. Can be applied direct-to-metal (DTM) for C1–C4 exposures per ISO 12944. 1–2 coats instead of 2–3 coats saves significant time, labor, and material cost.

✓ Bio-Resistant (Baudoinia & Broad-Spectrum Fungi)  •  ✓ Isocyanate-Free  •  ✓ VOC <100 g/l (90 g/l mixed)  •  ✓ SSPC Paint 36 Level 3A  •  ✓ ISO 12944 C3 High & C4 Medium  •  ✓ DTM Capable (C1–C4)

✏️ Need a project quote? Request Online

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

Carboxane 2100 BR by Carboline

Carboxane 2100 BR bio-resistant fungal resistant modified siloxane hybrid topcoat by Carboline — 1-gallon and 5-gallon kits
Carboxane 2100 BR — 1-Gal & 5-Gal Kits (Parts A & B)

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: 1-gallon kit (13 lbs)  •  5-gallon kit (67 lbs)

Coverage Rates & Technical Specifications

Recommended DFT: 3–7 mils per coat. 85% volume solids. As a single-coat DTM or as the finish of a 2-coat system, minimum 5 mils recommended. As the finish of a 3-coat system, minimum 3 mils. Allow for loss in mixing and application.

PropertyValueNotes
Generic TypeFungal Resistant Modified Siloxane HybridIsocyanate-free — not a polyurethane
FinishGlossOutstanding long-term color and gloss retention
Standard ColorsWhite (1864), Grey (C703), Light Grey (C705)Other limited colors available on request
Volume Solids85% ±2%Higher than Carboxane 2000 (75%) — better coverage per gallon
Recommended DFT3–7 mils (76–178 µm) per coatMin 5 mils for DTM or 2-coat system; min 3 mils in 3-coat system
Coverage @ 1 mil1,363 ft²/gal (33.5 m²/l)Theoretical — allow for loss
Coverage @ 3 mils454 ft²/gal (11.2 m²/l)Theoretical — 3-coat system finish minimum
Coverage @ 5 mils273 ft²/gal (6.7 m²/l)Theoretical — DTM or 2-coat system minimum
Coverage @ 7 mils195 ft²/gal (4.8 m²/l)Theoretical — maximum recommended DFT
Mix Ratio4:1 by volume (Part A to Part B)Part B: Carboxane 2100 FC Part B · do not mix partial kits
Pot Life5 hours at 75°F (23°C)Less at higher temps · moisture sensitive (check for skinning)
VOC (Mixed, EPA Method 24)0.75 lbs/gal (90 g/l)Less than 100 g/l — meets most stringent VOC limits
VOC (Thinner 236E @ 10 oz/gal)0.75 lbs/gal (90 g/l)Maintains sub-100 g/l VOC when thinned with 236E
VOC (Thinner 10 @ 10 oz/gal)1.23 lbs/gal (148 g/l)Only when VOC above 100 g/l is permissible
Isocyanate-FreeYesNo isocyanate hazards during application
Bio-ResistancePronounced inhibition of baudoinia & broad-spectrum fungiField tested — 2.5+ years resistance on ethanol storage tanks
Min Application TempMaterial 50°F (10°C) · Surface 35°F (2°C)—
Max Application TempMaterial 90°F (32°C) · Surface 110°F (43°C)—
Humidity Range20–90% RHMin 20% required — very dry conditions extend cure
Dry to Touch @ 75°F2 hoursBased on recommended coverage rates at 50% RH
Dry to Recoat @ 75°F3 hoursMaximum recoat window: 30 days
Dry to Handle @ 75°F4 hours—
Force CureUp to 140°F · 30 min to handleUseful for short shutdown maintenance windows
Dry Temp. Resistance302°F (150°C) continuous · 338°F (170°C) non-continuousSome discoloration/gloss loss at elevated temps
SSPC ComplianceExceeds SSPC Paint 36 Level 3AHighest level for polyurethanes
ISO 12944 RatingC3 High and C4 MediumOne coat applied DTM
Surface Prep — Steel DTMSSPC-SP6 · 1.5–2.5 mil profile—
Surface Prep — GalvanizedSSPC-SP16—
Thinning (Spray)Thinner 236E (up to 10%, 13 oz/gal)Not normally required · maintains 90 g/l VOC
Thinning (if VOC >100 g/l acceptable)Thinner 10 (up to 8%, 10 oz/gal)Raises VOC to 148 g/l
CleanupThinner 2, Thinner 225E, or Acetone—
Shelf Life — Part A24 months at 75°F (24°C)Unopened, stored indoors and dry
Shelf Life — Part B12 months at 75°F (24°C)Shorter than Part A — check dates before use
StorageIndoors · Keep Dry · 40–110°F · 0–90% RH—
Flash Point — Part A109°F (43°C)Setaflash
Flash Point — Part B100°F (38°C)Setaflash
Kit Sizes1-gal (13 lbs) · 5-gal (67 lbs)—

Source: Carboline Carboxane 2100 BR Product Data Sheet (August 2022, doc 1358). Coverage rates are theoretical — actual yield varies with surface profile, temperature, and application method.

Application Conditions

Condition Material Surface Ambient Humidity
Minimum50°F (10°C)35°F (2°C)35°F (2°C)20%
Maximum90°F (32°C)110°F (43°C)110°F (43°C)90%
⚠️ Substrate temperature must be at least 5°F (3°C) above the dew point. Protect from high humidity, dew, and direct moisture contact until dry to handle. Application above 90% RH or moisture from rain or dew may cause gloss loss and staining. Minimum 20% RH is required — very dry conditions also extend cure times and must be avoided.

Curing Schedule

Times based on recommended coverage rates at 50% RH. Low humidity extends cure times. Maximum recoat window: 30 days.

Surface Temp. Dry to Touch Dry to Recoat Dry to Handle
35°F (2°C)10 Hours24 Hours24 Hours
50°F (10°C)9 Hours8 Hours9 Hours
75°F (24°C)2 Hours3 Hours4 Hours
90°F (32°C)1 Hour2 Hours3 Hours

After 30 days, degloss by abrasive blasting or sanding before recoating.

Force cure: Product may be force cured up to 140°F. Cures to handle in 30 minutes when force cured at 140°F — useful for tight shutdown maintenance windows.

Industry Applications

Application Why Carboxane 2100 BR
Ethanol Storage Tank ExteriorsInhibits baudoinia black fungal growth on tank shells and roofs exposed to ethanol vapors — field tested for over 2.5 years with proven resistance vs. competing products
DistilleriesProtects structural and tank exteriors in alcohol-vapor-rich environments where black fungal growth is a persistent, costly maintenance problem
WineriesLong-term exterior protection and fungal resistance on tanks and facility structures in wine production and storage environments
Spirits Maturation FacilitiesGuards surfaces against baudoinia in a low-VOC formulation meeting stringent environmental regulations
BakeriesResists biological growth on exterior surfaces adjacent to yeast- and fermentation-producing processes
General Industrial (C1–C4)Meets ISO 12944-6 C3 High and C4 Medium applied DTM — suitable for urban to light industrial exposures requiring durable, low-maintenance topcoats
Severe Marine / Offshore3-coat system recommended for offshore structures; 2-coat system with 5-mil minimum for other severe industrial exposures

Per Carboline Carboxane 2100 BR PDS (August 2022, doc 1358) and Product Flyer.

Good to Know Before You Buy

⚠️ Application Notes & Pro Tips
  1. Power mix for a minimum of 3 minutes after combining parts. Power mix Part A and Part B separately before combining, then combine and power mix together for at least 3 minutes. Incomplete mixing compromises cure, film integrity, and bio-resistance performance. Do not mix partial kits.
  2. Bio-resistance requires correct DFT — minimum 5 mils for DTM and 2-coat systems. The fungal growth inhibition chemistry is built into the cured film. Insufficient film thickness can reduce effectiveness. Minimum 3 mils is acceptable only as the finish coat in a full 3-coat system.
  3. Part B shelf life is only 12 months — check the date. Part A lasts 24 months; Part B (Carboxane 2100 FC Part B) has a shorter 12-month shelf life. Always verify the Part B date before mixing on long-stored inventory.
  4. Maximum recoat window is 30 days. After 30 days, the surface must be deglossed by abrasive blasting or sanding before recoating. Factor this into sequencing on large or multi-phase projects.
  5. Thinner 236E maintains the <100 g/l VOC when thinning. Only Thinner 236E (up to 10%, 13 oz/gal) keeps VOC at 90 g/l. Thinning with Thinner 10 raises VOC to 148 g/l — only acceptable where higher limits apply. Thinning is not normally required for this high-solids coating.
  6. Minimum 20% RH required for cure. Unlike most topcoats with no lower humidity floor, Carboxane 2100 BR requires at least 20% relative humidity. Application in very dry conditions inhibits cure. Low humidity above 20% RH also extends cure times.
  7. 5-hour pot life at 75°F — monitor for skinning in open pots. Material is moisture sensitive. If the pot is left uncovered for extended periods or in high humidity conditions, check for and remove any skinned material before continuing application.
  8. Force cure at 140°F achieves handle in 30 minutes. When turnaround time is critical (shutdown windows, maintenance outages), force curing at 140°F dramatically accelerates the schedule.
  9. Can be applied over many existing, properly prepared coatings. Carboxane 2100 BR can be used for maintenance repaints over compatible existing coatings — eliminating full removal and saving significant time and money on existing infrastructure.
  10. Brush and roller require multiple coats to achieve DFT. Airless spray is the preferred production application method. Multiple coats are typically required via brush or roller to reach the 5–7 mil recommended DFT for DTM and 2-coat systems.

Frequently Asked Questions — Carboxane 2100 BR

What is Carboxane 2100 BR and what makes it different from a standard topcoat?
Carboxane 2100 BR is a fungal resistant modified siloxane hybrid — not a polyurethane. It is isocyanate-free and contains bio-active chemistry that exhibits pronounced growth inhibition against baudoinia and a broad spectrum of other bacteria and fungi. At 85% solids by volume and less than 100 g/l VOC, it delivers significantly better coverage and lower environmental impact than conventional topcoats, while meeting SSPC Paint 36 Level 3A weathering and ISO 12944 C4 Medium corrosion ratings.
What is baudoinia and why does Carboxane 2100 BR resist it?
Baudoinia is an unsightly black fungal growth that thrives in environments with ethanol and alcohol vapors — distilleries, wineries, ethanol storage tanks, and bakeries are common affected sites. The spores are extremely difficult to remove and grow back repeatedly after cleaning. Carboxane 2100 BR is specifically formulated to exhibit pronounced growth inhibition against baudoinia and a broad spectrum of other bacteria and fungi. Field testing on an ethanol storage tank showed the Carboxane 2100 BR area remained visibly clean for over 2.5 years compared to surrounding areas coated with conventional products.
Can Carboxane 2100 BR be applied direct to metal (DTM)?
Yes — Carboxane 2100 BR can be applied direct to metal for exposures classified C1–C4 (urban to light industrial) per ISO 12944. Prepare the surface to SSPC-SP6 with a 1.5–2.5 mil angular surface profile. A minimum of 5 mils DFT is recommended for single-coat DTM. It meets ISO 12944-6 C3 High and C4 Medium ratings applied as a single coat DTM. For more severe exposures, apply over an approved primer.
What is the mix ratio and how do I mix Carboxane 2100 BR?
Carboxane 2100 BR uses a 4:1 mix ratio by volume — 4 parts Part A to 1 part Part B (Carboxane 2100 FC Part B). Power mix each component separately first, then combine and power mix together for at least 3 minutes to ensure thorough mixing. Do not mix partial kits. Pot life is 5 hours at 75°F (23°C), shorter at higher temperatures. Material is moisture sensitive — check for and remove any skinning before use.
What is the maximum recoat window?
The maximum recoat window for Carboxane 2100 BR is 30 days. After this period, degloss the surface by abrasive blasting or sanding prior to recoating to ensure proper adhesion. Plan your project schedule accordingly on large or multi-phase work.
What VOC level does Carboxane 2100 BR meet?
Carboxane 2100 BR contains less than 100 g/l VOC as mixed — specifically 0.75 lbs/gal (90 g/l) per EPA Method 24 as supplied mixed. Thinning with Thinner 236E at 10 oz/gal maintains the 90 g/l VOC level. Thinning with Thinner 10 at 10 oz/gal raises VOC to 148 g/l, which is only acceptable where higher VOC limits apply. The product contains US EPA VOC-exempt solvents.
What temperature and humidity conditions are required?
Material temp: 50–90°F · Surface temp: 35–110°F · Ambient temp: 35–110°F · Humidity: 20–90% RH. Substrate temperature must be at least 5°F above the dew point. The 20% minimum humidity is important — very dry conditions inhibit cure. Application or curing above 90% RH or exposure to rain or dew before cure may result in gloss loss and staining. Force curing at up to 140°F is permitted when schedule requires, achieving dry-to-handle in 30 minutes.

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