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Carbozinc 11 HS Zinc Primer by Carboline

Carbozinc 11 HS - Low VOC Zinc Primer

by Carboline
$362.32 - $1,254.23
$362.32
$362.32 - $1,254.23
$362.32

Carbozinc 11 HS - Low VOC Zinc Primer is a high-performance, inorganic zinc-rich primer engineered by Carboline for superior galvanic corrosion protection in industrial, atmospheric, and harsh environments.

This ultra-low VOC primer combines high zinc loading for exceptional cathodic protection, rapid cure, low-temperature application down to 15°F, and compatibility with faying surfaces (Class B slip coefficient), making it ideal for steel structures, tanks, vessels, piping, bridges, and infrastructure requiring long-term corrosion resistance with regulatory VOC compliance.

Carbozinc 11 HS PDS >
Finish: Flat / Matte
Theoretical Coverage: 602 ft²/gal at 2 mils DFT · 401 ft²/gal at 3 mils DFT (recommended range). Allow for application loss. Refer to PDS for full coverage table.

VIEW THE ENTIRE LINE OF CARBOLINE COATINGS HERE >

Key Features:

  • Ultra-Low VOC & High Zinc Loading: Provides excellent galvanic protection while meeting stringent VOC regulations; 84% zinc by weight in dry film for superior cathodic action.
  • Rapid Cure & Low-Temp Application: Dry to handle in 1 hour at 75°F; cures down to 15°F for year-round use and fast project turnaround.
  • Faying Surface Compatibility: Meets Class B slip co-efficient and creep criteria (slip coefficient 0.58) for bolted connections in structural steel applications.
  • Weldable Pre-Construction Primer: May be used as a weldable shop primer at 0.50–1.00 mils DFT.
  • Exceptional Salt Spray Resistance: No rusting or blistering after 70,000 hours in ASTM B117 salt spray testing.

Common Industry Applications:

  • Industrial & Petrochemical: Primer for tanks, vessels, piping, and structures in refineries, plants, and facilities exposed to corrosive atmospheres.
  • Infrastructure & Offshore: Structural steel, bridges, platforms, and equipment in harsh marine or coastal environments needing galvanic protection.
  • General Maintenance & Heavy-Duty Protection: Steel fabrication, shop priming, and field applications in aggressive conditions requiring low-VOC, high-performance zinc primers.

Carbozinc 11 HS is a THREE-COMPONENT SYSTEM (PART A — BASE, PART B — ZINC FILLER, PART C — ACTIVATOR). Product will not cure without Part C (Activator). Do not mix partial kits.

Product type: Inorganic Zinc Silicate Primer (Low VOC).
Finish: Flat / Matte.
Applied via: Airless Spray, Conventional Spray, Brush (touch-up only, areas under 1 sq ft). Roller: Not recommended.
Pot Life: 8 hours at 75°F (24°C).
Min. Application Temp: 15°F (−9°C) material, surface & ambient · 30% min. relative humidity.

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 low-VOC inorganic zinc primer?
Contact our customer support today to discuss your project:
(800) 567-5358

Size: .72Gal
Color: Green 0300
Coverage Calculator

Compatible Thinners

Thinner Conditions Notes
Thinner No. 26 Normal conditions Standard thinner — up to 11 oz per 0.72 gal kit
Thinner No. 33 Normal conditions Standard thinner — up to 11 oz per 0.72 gal kit
Thinner No. 254 Normal conditions Up to 11 oz per 0.72 gal kit; slow-evaporating option
Thinner No. 237 Cold / low-humidity (below 40°F / 4°C) For cold weather or low-RH application conditions
Thinner No. 236E (exempt) Weldable pre-construction primer use only Start at 10%, up to 30% — to achieve 0.50–1.00 mil DFT;

⚠️ Use of thinners other than those supplied by Carboline may adversely affect product performance and void the manufacturer's warranty. Consult the Carbozinc 11 HS PDS for exact thinning ratios.

Topcoat Compatibility

Standard Protective System — Structural Steel
Primer (This Product) Carbozinc 11 HS 2–3 mils DFT · SSPC-SP6 blast
→
Intermediate / Finish Epoxy, Polyurethane, or Acrylic Per Carboline recommendation
⚠️ Under certain conditions, a mist coat may be required before applying the full topcoat to minimize bubbling. Consult Carboline Technical Service for system-specific guidance.
High-Temperature System
Primer (This Product) Carbozinc 11 HS 2–3 mils DFT · 750°F continuous untopcoated
→
Topcoat High-Temperature Silicone Up to 1000°F continuous / 1200°F non-continuous
Faying Surface (Class B Slip)
Single Coat — No Topcoat Carbozinc 11 HS 2–3 mils · Slip coefficient 0.58 · Class B certified
Decorative Finish System — Armorlast Series
Primer (This Product) Carbozinc 11 HS 2–3 mils DFT · cure 2 hrs at 70°F before topcoat
→
Finish Armorlast Series Inorganic silicate finish coat

Frequently Purchased Together

Carboline Thinner No. 33
Standard Thinner
Carboline Thinner No. 33
Approved thinner for Carbozinc 11 HS under normal conditions. Up to 11 oz per 0.72 gal kit.
$137.22
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Carboguard 890 Epoxy
Epoxy Intermediate / Topcoat
Carboguard 890
Self-priming epoxy compatible for use over Carbozinc 11 HS. A mist coat may be required before the full coat under certain conditions.
From$419.48
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Carbothane 134 HG
Polyurethane Finish Topcoat
Carbothane 134 HG
UV-stable polyurethane finish coat. Compatible for use over Carbozinc 11 HS per Carboline recommendations.
From$292.27
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Carboguard 893 Epoxy Primer
Epoxy Intermediate (Alternative)
Carboguard 893
Corrosion-resistant epoxy intermediate compatible over Carbozinc 11 HS per Carboline recommendations.
From$439.48
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Carbozinc 11 HS Low-VOC Inorganic Zinc Silicate Primer by Carboline

Product Specs — Carbozinc 11 HS

Carbozinc 11 HS — Low-VOC Inorganic Zinc Silicate Primer by Carboline.
A high-zinc-loaded inorganic zinc silicate primer combining unparalleled corrosion resistance with an ultra-low VOC formulation that meets some of the most stringent VOC restrictions. 84% zinc dust by weight in the dry film. 75% volume solids. Rapid cure (1 hour dry-to-handle at 75°F). Cures down to 15°F. AASHTO M300 tested. 70,000-hour ASTM B117 salt spray performance. Also functions as a weldable pre-construction primer at 0.50–1.00 mils DFT.

✓ Inorganic Zinc Silicate (IOZ)  •  ✓ 84% Zinc Dust by Weight in Dry Film  •  ✓ Ultra-Low VOC (2.4 lbs/gal)  •  ✓ Class B Slip Coefficient (ASTM A-325/A-490)  •  ✓ AASHTO M300 Tested  •  ✓ Cures to 15°F

✏️ Need a project quote? Request Online

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

Carbozinc 11 HS by Carboline

Carbozinc 11 HS low-VOC inorganic zinc silicate primer kit by Carboline — structural steel corrosion protection
Carbozinc 11 HS — Low-VOC Inorganic Zinc Silicate Primer

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.

Hazmat note: Zinc powder (Part B) may be subject to hazmat shipping regulations. Call ahead to confirm packaging and freight options.

Coverage Rates & Technical Specifications

Recommended DFT: 2–3 mils per coat. 75% volume solids. Allow for application loss in all coverage estimates.

Property Value Notes
Product TypeInorganic Zinc SilicateSolvent-based 3-component IOZ primer
Components3-Part Kit (A + B + C)Part A: Base · Part B: Zinc Filler · Part C: Activator
Recommended DFT2–3 mils (51–76 µm)Up to 5 mils for OEM in controlled environments
Coverage @ 1 mil1,203 ft²/gal (29.5 m²/l)Theoretical — allow for loss
Coverage @ 2 mils602 ft²/gal (14.8 m²/l)Theoretical — typical specification DFT
Coverage @ 3 mils401 ft²/gal (9.8 m²/l)Theoretical — maximum recommended DFT
Volume Solids75% ±2%Per ASTM D 2697
Zinc Dust in Dry Film84% by weightHigh zinc loading for galvanic cathodic protection
VOC (As Supplied)2.4 lbs/gal (288 g/l)Ultra-low VOC; meets stringent VOC restrictions
Pot Life8 hours at 75°F (24°C)Less at higher temperatures
Dry to Handle @ 75°F1 hourAt 50% relative humidity
Dry to Topcoat @ 75°F18 hoursSee full curing schedule for other temperatures
Application MethodsConventional Spray, Airless Spray, BrushBrush for touch-up only (under 1 sq ft); NO ROLLER
Preferred ThinnersThinner 26, 33, or 254Up to 11 oz per 0.72-gal kit · Thinner 236E for weldable primer applications
Surface Prep (Steel)SSPC-SP6 BlastSurface profile 1.0–3.0 mils (25–75 µm)
Service Temp (Untopcoated)750°F continuous / 800°F non-continuousWith high-heat topcoats: 1,000°F / 1,200°F
Min Application Temp15°F (–9°C)Material, surface & ambient · 30% minimum humidity
Max Humidity95% RHMin 30% RH required; below 50% RH extends cure time
Weld-Through CapabilityYes — at 0.50–1.00 mils DFTWeldable pre-construction primer; thin with Thinner 236E
AASHTO M300Tested — no blistering or rustingPer AASHTO M300 standard
ASTM B117 Salt Spray70,000 hoursNo rusting or blistering; only slight rust in scribe, no creepage
Slip Coefficient0.58 — Class B (ASTM A-325/A-490)Approved for faying surfaces in bolted connections
Pencil Hardness3H (ASTM D3363)—
Colors AvailableGreen (standard) · Grey (special order)Flat finish

Source: Carboline Carbozinc 11 HS Product Data Sheet (Feb 2025). Coverage rates are theoretical — actual yield varies with surface profile, temperature, and application technique.

Good to Know Before You Buy

⚠️ Pro Tips & Gotchas — 3-Component IOZ Primer

  1. 3-component system — do not mix partial kits. Carbozinc 11 HS requires all three components (Base, Zinc Filler, and Activator). It will not cure without the Activator. Always mix full kits only and pour through a 30-mesh screen to remove dry zinc lumps before application.
  2. No roller application. Roller is not permitted. Use conventional spray, airless spray, or brush only. Brush is for touch-up of areas under 1 sq ft only — avoid rebrushing.
  3. Low humidity extends cure time significantly. Below 50% RH, cure slows. Below 40% RH, allow a 2-hour ambient cure then mist with clean potable water or steam for a minimum of 8 hours to achieve proper cure. Minimum required humidity is 30% RH.
  4. Verify cure readiness before topcoating. The coating is ready to topcoat when it achieves a 2H pencil hardness per ASTM D3363 or a minimum rating of 4 per ASTM D4752. Remove any loose zinc (dry spray/overspray) with fiberglass or aluminum screen wire before topcoating.
  5. Cold-weather capable down to 15°F (–9°C). One of the lowest minimum application temperatures of any inorganic zinc primer. Suitable for winter application where other products cannot be used. Humidity requirements still apply.
  6. Weldable pre-construction primer at reduced DFT. Can be applied at 0.50–1.00 mils DFT as a weldable primer. Thin with Thinner 236E (starting at 10%, up to 30%) for this application. Consult Carboline Technical Service for guidance before use.
  7. Exceptional salt spray performance. 70,000 hours in ASTM B117 with no rusting or blistering and only slight rust in the scribe with no undercutting. This is among the strongest long-term corrosion resistance data published for any inorganic zinc primer.
  8. High-heat service without a topcoat. Rated to 750°F continuous / 800°F non-continuous without a topcoat. With compatible high-temperature topcoats, service temperatures extend to 1,000°F / 1,200°F. Consult Carboline for appropriate high-heat system selection.

Frequently Asked Questions — Carbozinc 11 HS

What is the coverage rate for Carbozinc 11 HS?
Carbozinc 11 HS covers 602 ft²/gal at 2 mils DFT and 401 ft²/gal at 3 mils DFT (theoretical, based on 75% volume solids). The recommended dry film thickness is 2–3 mils for standard applications. Allow for application loss — practical yield is typically 15–20% less than theoretical. For weldable pre-construction primer use, apply at 0.50–1.00 mils DFT.
What is the mix procedure for Carbozinc 11 HS?
Carbozinc 11 HS is a 3-component system. Power mix Part A (base) first, then slowly pour Part B (zinc filler) into Part A with continuous agitation until free of lumps. Then add Part C (activator) and mix for 2 more minutes. Pour through a 30-mesh screen. Do not mix partial kits — the product will not cure without the activator. Pot life is 8 hours at 75°F.
Does Carbozinc 11 HS require a mist coat before topcoating?
Under certain conditions, a mist coat may be required before applying the full topcoat to minimize bubbling. Carbozinc 11 HS may be topcoated with Waterborne Acrylics, Epoxies, Polyurethanes, High Temperature Silicones, and Armorlast Series inorganic silicate finishes. Consult Carboline Technical Service for your specific system and application conditions.
Can Carbozinc 11 HS be applied with a roller?
No. Roller application is not permitted for Carbozinc 11 HS. Rolling disrupts the zinc particle distribution and film structure, resulting in poor galvanic protection, non-uniform DFT, and potential adhesion failure. Use conventional spray, airless spray, or brush (brush for touch-up only).
How does Carbozinc 11 HS cure and what humidity is required?
Carbozinc 11 HS cures through reaction with atmospheric moisture. Minimum humidity is 30% RH; maximum is 95% RH. Humidity below 50% RH will slow cure. For RH below 40%, allow a 2-hour ambient cure then mist with clean potable water or steam for a minimum of 8 hours. The coating is ready to topcoat when it achieves 2H pencil hardness per ASTM D3363 or a minimum rating of 4 per ASTM D4752. Remove any loose zinc (dry spray/overspray) before topcoating.
How does Carbozinc 11 HS differ from standard Carbozinc 11?
Carbozinc 11 HS is a 3-component low-VOC inorganic zinc silicate with 84% zinc dust by weight in the dry film, 75% volume solids, and an ultra-low VOC of 2.4 lbs/gal. Key advantages over standard Carbozinc 11 include: 70,000-hour ASTM B117 salt spray performance, lower minimum application temperature (15°F vs. 0°F), weldable pre-construction primer capability, and a formulation meeting more stringent VOC restrictions. Standard Carbozinc 11 is a 2-component system with a different VOC and solids profile.
What performance tests has Carbozinc 11 HS passed?
Carbozinc 11 HS has been tested to AASHTO M300 (no blistering or rusting), ASTM B117 Salt Spray for 70,000 hours (no rusting or blistering; only slight rust in scribe, no creepage at scribe), ASTM A-325/A-490 (slip coefficient 0.58 — meets Class B rating for faying surfaces in bolted connections), and ASTM D3363 pencil hardness (3H).
Can Carbozinc 11 HS be used as a weldable pre-construction primer?
Yes. Carbozinc 11 HS can be applied at 0.50–1.00 mils DFT as a weldable pre-construction primer. For this application, thin with Thinner 236E starting at 10% and up to 30% to achieve the required lower film build. Consult Carboline Technical Service for guidance on weldable primer systems before proceeding.

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