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Shop All ProductsHighLine 510H takes the pure polyurea chemistry of HighLine 510 and pushes it harder. Here are the verified TDS specs, how it compares with 510 and where it belongs.
HighLine 510 earned a loyal following as ArmorThane's moisture-resistant pure polyurea. HighLine 510H grew out of that success. ArmorThane describes it as one of its highest quality formulations: pure polyurea like 510, but engineered to exceed it with greater durability and hardness for the most demanding industrial work.
If you spray power plants, mines, structural steel or containment, this is the product to know.
Per the technical data sheet, HighLine 510H is a fast setting, rapid curing, 100% solids, flexible, aromatic, two-component spray polyurea for concrete and metal. It has zero VOC, is seamless and odorless, and offers excellent thermal stability and good chemical resistance. It can coat carbon or mild steel without a primer.
The headline is the balance. At 55 Shore D it is hard, yet it still stretches to 400%, so it resists abrasion without turning brittle when the substrate moves or takes a hit.
Here is how ArmorThane positions the two pure polyureas side by side:
| Trait | HighLine 510 | HighLine 510H |
|---|---|---|
| Chemistry | Pure polyurea, 100% solids | Pure aromatic polyurea, 100% solids |
| Design focus | Makes the most of polyurea's moisture resistance | Harder, heavy-industrial variant with an emphasis on corrosion resistance |
| Hardness and abrasion | Standard | Harder and more abrasion resistant than 510 |
| Skid resistance | Not emphasized | Superior skid resistance per ArmorThane |
| Moisture sensitivity | Moderate moisture tolerance | Lower sensitivity to moisture while spraying |
| Tack-free | Less than 60 seconds | 45 to 60 seconds |
| Primer on carbon or mild steel | Not required | Not required |
| Best fit | Containment, water features, sanitation, general industrial | Mining, power plants, structural steel, heavy containment |
In plain terms: 510 is a versatile pure polyurea for moisture-prone work, and 510H is the one you bring when abrasion, impact and harsh service are the main threat.
| Property | Value |
|---|---|
| Mix ratio | 1A:1B by volume |
| Tensile strength (ASTM 412-C) | 2800 ± 200 psi |
| Elongation (ASTM 412-C) | 400% ± 50 |
| Hardness (ASTM D-2240) | 55 ± 5 Shore D |
| Tear (ASTM 624-C) | 400 ± 50 pli |
| Pot life at 150°F (66°C) | 4 to 8 seconds |
| Tack-free time | 45 to 60 seconds |
| Recoat time | 0 to 6 hours |
| Density / specific gravity | 8.81 lbs/gal / 1.10 |
| Lineal shrinkage | 1 to 2% |
| Service temperature | -40 to 250°F (-40 to 121°C) |
| VOC | 0 g/L |
| Packaging | 100-gallon kit, 50 gal Side A and 50 gal Side B |
| Shelf life | One year in factory-sealed containers |
ArmorThane's TDS and product page list a long run of heavy-duty applications, including:
510H is a high-pressure material with a very short pot life, so rig setup matters. From the TDS:
Pro tip: With a 4 to 8 second pot life, any pressure imbalance shows up fast as soft or brittle spots. Watch your A and B gauges, and if they drift, run through our equipment troubleshooter before you keep spraying.
Coating performance and adhesion are directly proportional to surface preparation, as the TDS puts it. Remove dust, dirt, oil, grease, rust and corrosion before you pull the trigger.
Because 510H is aromatic, the TDS notes it will tend to yellow or darken after UV exposure. That is a color change, not a reason to avoid it outdoors. Where appearance matters, ArmorThane recommends topcoating with UV Topcoat or UV ColorCoat for a color-fast, glossy finish, applied within the recoat window.
Safety: Spraying hot polyurea at 2800 psi or more puts isocyanate aerosol in the air and creates injection risk at the gun. Use supplied-air or appropriate respiratory protection, full skin and eye cover, and never point the gun at anyone. See our safety supplies.
HighLine 510H is the pure polyurea we reach for when a job is going to be beaten on. If your work is lighter duty or you want one all-rounder for bedliners, ArmorLiner or HighLine 510 may be the better value. For heavy industrial service, 510H earns its place.
Find HighLine 510H, HighLine 510 and ArmorThane topcoats in our coatings and chemicals collection. Approved applicators see account pricing through the Applicator Program, and the tech line at (417) 831-5090 can help you choose between 510 and 510H.
Both are pure polyureas. ArmorThane engineered 510H as a tougher, harder industrial variant that is more abrasion and skid resistant than 510, with lower sensitivity to moisture during application.
The TDS lists 55 ± 5 Shore D (ASTM D-2240), with 400% ± 50 elongation, so it is hard without being brittle.
ArmorThane states it can be applied at temperatures as low as 20°F (-6°C). The substrate must still be at least 5°F above the dew point.
The TDS says it can coat carbon or mild steel without a primer. Surface prep still governs adhesion, so remove rust, mill scale, oil and contaminants first.
No. It is aromatic and will tend to yellow or darken in UV. ArmorThane recommends UV Topcoat or UV ColorCoat for a color-fast finish.
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