What are the SSPC/NACE surface preparation grades for structural steel?

SSPC/NACE surface preparation standards define the cleanliness level required before coating application. SP 1 is solvent cleaning to remove oil and grease — always required as pre-treatment before other methods. SP 2 (hand tool cleaning, ISO St 2) uses wire brushes and scrapers for minor maintenance work. SP 3 (power tool cleaning, ISO St 3) uses power wire brushes and needle guns for touch-up and maintenance. SP 6 / NACE 3 (commercial blast, ISO Sa 2) removes all oil, grease, dirt, mill scale, and rust except for tightly adherent residues on 1/3 of each square inch — suitable for moderate-service coatings. SP 10 / NACE 2 (near-white blast, ISO Sa 2.5) leaves only light stains from rust, mill scale, or coatings on less than 5% of each square inch — this is the most commonly specified grade for structural steel in buildings and bridges. SP 5 / NACE 1 (white metal blast, ISO Sa 3) removes all visible rust, mill scale, paint, and foreign matter — required for zinc-rich primers and critical immersion service. Studies consistently show 60-80% of coating failures result from inadequate surface preparation, not coating defects. The anchor pattern (surface profile) created by blasting provides mechanical adhesion and should match the coating thickness: 1.0-2.0 mils for thin-film coatings, 2.0-3.0 mils for thick-film, 3.0-4.0 mils for thermal spray.

How do I select a paint system for structural steel using ISO 12944?

ISO 12944 classifies environments from C1 (very low corrosivity, heated interiors) to CX (extreme, offshore immersion), determining the required coating system and dry film thickness (DFT). C1/C2 environments (interior, rural) use economy alkyd systems at 80-120 micron DFT for 15-year life. C3 (urban/industrial, moderate humidity) is the most common for structural steel buildings, requiring epoxy primer + polyurethane topcoat at 160-200 micron DFT. C4 (industrial with chemicals, mild coastal) needs zinc-rich epoxy primer + epoxy MIO intermediate + polyurethane topcoat at 200-280 micron. C5 (marine splash zone, heavy industrial) requires organic zinc + epoxy + fluoropolymer at 280-400 micron. CX (offshore, immersed) uses duplex systems: galvanizing + epoxy + polyurethane at 320+ micron, or thermal spray aluminum (TSA) with sealer for 35+ year design life. The coating system total DFT increases roughly 40 micron for each design life increment (15→25→35+ years) at the same corrosivity level. Zinc-rich primers provide cathodic protection (the zinc sacrifices itself to protect the steel) and are essential for C4 and above. MIO (micaceous iron oxide) in intermediate coats creates a laminar barrier that dramatically improves water vapor resistance.

What are the hot-dip galvanizing thickness requirements per ASTM A123?

ASTM A123 specifies minimum zinc coating thickness based on steel thickness. For structural steel greater than 6 mm (1/4 in) thick: minimum 85 microns (3.4 mils) coating thickness, equivalent to 610 g/m² zinc mass. For 3-6 mm steel: 70 microns (505 g/m²). For 1.5-3 mm: 55 microns (395 g/m²). For steel under 1.5 mm: 45 microns (325 g/m²). EN ISO 1461 specifies identical values. Galvanizing adds 3-5% to steel weight. Key design considerations: vent and drain holes must be provided in hollow sections to prevent explosion during dipping and allow zinc drainage; asymmetric or welded assemblies may distort due to thermal stresses at the 450°C (840°F) bath temperature; material chemistry affects coating thickness — silicon-killed steels (Si > 0.04%) produce thicker, darker, more brittle coatings; field welding of galvanized steel requires grinding off the zinc coating within the weld zone to prevent zinc fume inhalation and weld porosity, followed by zinc-rich paint touch-up; and for members exceeding bath dimensions (typical large facility: 18 m × 2 m × 3 m), progressive double-end dipping is possible but adds cost and may produce a visible overlap line. The standard bath sizes range from 6 m (small regional), 10 m (medium), to 18 m (major facility) in length.

How does weathering steel (Corten) work and when should it be used?

Weathering steel (ASTM A588, A242, commonly called Corten) develops a protective patina (rust layer) when exposed to wet-dry cycling, eliminating the need for paint in suitable environments. The patina forms in 18-36 months through cycles of wetting (rusting) and drying (oxidation and densification). After maturation, the patina is dense, adherent, and self-healing if scratched. Weathering steel is ideal for bridges, exposed architectural steel, transmission towers, and sculptures in moderate climates. However, it must NOT be used in: marine splash zones or within 2 km of salt water (the patina never stabilizes due to continuous chloride exposure), continuously wet conditions (the patina requires drying cycles), areas with high SO₂ industrial pollution (acid rain dissolves the patina), or de-icing salt spray zones (bridge girders over salted roadways need supplemental protection). Design details matter: eliminate water traps and horizontal surfaces where water ponds, avoid crevices where capillary action holds moisture, specify weathering steel fasteners (ASTM A325 Type 3 bolts with matching chemistry), and detail run-off staining — the initial rust wash will stain adjacent concrete, stone, and glass unless directed with drip edges and controlled drainage paths. Weathering steel saves 15-25% in life-cycle cost compared to painted steel in suitable environments due to eliminated painting and maintenance.

What is duplex coating and when is it specified?

A duplex coating system combines hot-dip galvanizing with a paint topcoat, providing service life far exceeding the sum of each system applied individually — typically 1.5 to 2.5 times the combined life. The zinc layer provides cathodic protection at scratches and edges, while the paint topcoat seals the zinc from initial weathering, dramatically reducing the zinc corrosion rate. Duplex systems are specified for: C5 and CX environments (marine splash zones, offshore, chemical plants) where 35+ year design life without maintenance is required, architectural steel where the gray galvanized appearance is undesirable and a colored finish is wanted, and steel that will be buried or immersed. Surface preparation for painting over galvanizing requires sweep blasting (very light brush blast at 30-40 psi with fine abrasive) to create a profile without removing excessive zinc, or application of a zinc-compatible etch primer (T-Wash or equivalent) for hand application. Standard epoxy and polyurethane topcoats are compatible with galvanized substrates when proper surface prep is followed. Alkyd paints must NOT be applied directly to galvanizing — the saponification reaction between alkyd resins and zinc produces soaps at the interface that cause widespread delamination within 1-2 years.

Surface Finish — SSPC Grades, Coatings & Corrosion Protection

SSPC/NACE surface preparation standards, ISO 12944 corrosivity categories, paint system selection, hot-dip galvanizing, and weathering steel (Corten) design.

Why surface preparation matters

The performance and durability of any steel coating system depends more on surface preparation than on the coating itself. A premium epoxy system applied over mill scale and rust will delaminate within 2-3 years, while a basic alkyd primer over properly blast-cleaned steel can last 10-15 years. Surface preparation removes mill scale, rust, old coatings, and contaminants, creating a clean profile for the coating to grip.

Industry studies consistently show that 60-80 percent of coating failures are caused by inadequate surface preparation, not coating defects. This is why specifications always define the required surface preparation grade.

SSPC/NACE surface preparation grades

SSPC Grade	NACE Grade	ISO 8501-1	Description	Typical application
SP 1	—	—	Solvent cleaning (removes oil, grease)	Pre-treatment before all other methods
SP 2	—	St 2	Hand tool cleaning (wire brush, scraping)	Minor maintenance, low-performance systems
SP 3	—	St 3	Power tool cleaning	Touch-up, maintenance
SP 6	NACE 3	Sa 2	Commercial blast cleaning (2/3 of surface clear)	Moderate-service coatings
SP 10	NACE 2	Sa 2.5	Near-white blast (95% clear)	High-performance coatings, immersion service
SP 5	NACE 1	Sa 3	White metal blast (100% clear)	Zinc-rich primers, critical immersion

SP 10 / NACE 2 (near-white blast) is the most commonly specified grade for structural steel in buildings and bridges. SP 5 (white metal) is reserved for the highest-performance applications because it is expensive and difficult to maintain before coating.

Surface profile (anchor pattern)

Blast cleaning creates a microscopic peak-and-valley texture measured in mils (thousandths of an inch) or micrometers. This profile provides mechanical adhesion for the coating. Target profiles:

Thin-film coatings (< 75 micron DFT): 25-50 micron profile (1.0-2.0 mils)
Thick-film coatings (75-250 micron DFT): 50-75 micron profile (2.0-3.0 mils)
Thermal spray zinc/aluminum: 75-100 micron profile (3.0-4.0 mils)

Profile is measured with replica tape (Testex) per ASTM D4417. Too shallow a profile gives poor adhesion; too deep wastes coating material filling the valleys.

ISO 12944 corrosivity categories

Category	Environment example	Typical steel loss (micron/yr)	Coating system DFT
C1 (very low)	Heated interior, dry	<= 1.3	80-120 micron
C2 (low)	Unheated interior, rural atmosphere	1.3-25	120-160 micron
C3 (medium)	Urban/industrial, moderate humidity	25-50	160-200 micron
C4 (high)	Industrial with chemicals, coastal mild	50-80	200-280 micron
C5 (very high)	Marine splash zone, heavy industrial	80-200	280-400 micron
CX (extreme)	Offshore, immersed	> 200	400+ micron or TSA

Coating system selection by corrosivity and design life

Environment	15-Year Life	25-Year Life	35+ Year Life
C2	Alkyd primer + topcoat (120)	Epoxy primer + polyurethane topcoat (160)	Galvanize (85 micron)
C3	Epoxy primer + topcoat (160)	Zinc-rich epoxy + epoxy + polyurethane (200)	Galvanize + topcoat (160)
C4	Zinc-rich epoxy + PU (220)	Zinc-rich epoxy + epoxy MIO + PU (280)	Galvanize + epoxy + PU (250)
C5	Zinc-rich + epoxy MIO + PU (280)	Organic zinc + epoxy + fluoropolymer (350)	Thermal spray zinc (200) + sealer
CX	Duplex: galvanize + epoxy + PU (320)	TSA zinc (200) + sealer	TSA zinc/aluminum (250) + sealer + PU

Values in parentheses are total DFT in microns. PU = polyurethane topcoat. MIO = micaceous iron oxide.

Paint system types for structural steel

System	Coat 1 (primer)	Coat 2 (intermediate)	Coat 3 (topcoat)	Total DFT (micron)	Best For
Alkyd (economy)	Alkyd primer (40)	—	Alkyd enamel (40)	80	C1-C2, interior
Epoxy (standard)	Epoxy primer (75)	Epoxy intermediate (100)	Polyurethane topcoat (50)	225	C3, buildings
Zinc-rich (high perf)	Zinc-rich epoxy (75)	Epoxy MIO (125)	Polyurethane (50)	250	C4, bridges
Inorganic zinc (severe)	IOZ primer (75)	Epoxy intermediate (150)	Polyurethane (50)	275	C5, marine
Moisture-cure (field)	MC urethane zinc (75)	MC urethane intermediate (100)	MC urethane topcoat (50)	225	C3-C4, field touch-up
Intumescent (fire + corr)	Epoxy primer (50)	Intumescent base (500-2000)	Intumescent sealer (50)	600-2100	C2-C3, fire rated

Hot-dip galvanizing key values

Minimum coating thickness by steel thickness (ASTM A123 / EN ISO 1461)

Steel thickness	Min. coating (ASTM A123)	Min. coating (EN ISO 1461)	Zinc mass (g/m^2)
> 6 mm	85 micron	85 micron	610
3-6 mm	70 micron	70 micron	505
1.5-3 mm	55 micron	55 micron	395
< 1.5 mm	45 micron	45 micron	325

Galvanizing adds 3-5 percent to steel weight. Distortion can occur in asymmetric or welded assemblies. Discuss dipping sequence with the galvanizer before fabrication.

Galvanizing bath size limitations

Typical Bath Dimension	Max. Length	Max. Width	Max. Depth	Max. Section
Small (regional)	6 m (20 ft)	1.0 m	1.5 m	W24x84, HSS12x12
Medium (standard)	10 m (33 ft)	1.5 m	2.0 m	W36x300, HSS16x16
Large (major facility)	18 m (60 ft)	2.0 m	3.0 m	W44x335, built-up
Progressive dip	No limit	1.5 m	2.0 m	Long members, sequential

For members exceeding bath dimensions, progressive (double-end) dipping is possible but adds cost and may produce a visible overlap line.

Weathering steel (ASTM A588 / A709 Gr 50W)

Weathering steel forms a protective rust patina when exposed to alternating wet and dry cycles. The patina stabilizes after 2-3 years and slows further corrosion to approximately 0.5 mil/year.

Weathering steel suitability criteria

Factor	Suitable for Weathering Steel	NOT Suitable
Environment	Rural, arid, moderate industrial	Marine (chlorides), heavy industrial
Wet/dry cycling	Regular exposure to sun/rain alternation	Persistent moisture, buried, immersed
Detailing	Details that shed water, no crevices	Crevice joints, flat horizontals
De-icing salt exposure	Minimal or none	Highway structures with salt spray
Inspection access	Visible, accessible	Enclosed, hidden, behind finishes

Corrosion loss comparison (micron/year)

Environment	Carbon Steel (A36)	Weathering Steel (A588)	Ratio
Rural	10-20	3-5	4:1
Urban	20-40	5-10	4:1
Industrial	30-60	8-15	4:1
Marine (<1 km)	50-100	20-40	2.5:1
Marine (<100 m)	80-200	40-80	2:1

Weathering steel is 4 times more corrosion-resistant in non-marine environments. The advantage diminishes near coastlines.

Worked example — coating system selection

Project: exterior exposed steelwork for a coastal commercial building, 50 m from shoreline. Design life = 25 years. Environment category C5 (very high).

Per ISO 12944-5, a suitable system for C5 with 25-year durability (high durability class) is:

Surface prep: SP 10 / Sa 2.5 (near-white blast) to 50-75 micron profile.
Coat 1: Zinc-rich epoxy primer, 75 micron DFT.
Coat 2: Epoxy MIO (micaceous iron oxide) intermediate, 125 micron DFT.
Coat 3: Polyurethane topcoat, 50 micron DFT.
Total system DFT: 250 micron minimum (meets C5 requirement of 280 micron — increase intermediate to 150 micron to comply).

Revised total: 75 + 150 + 50 = 275 micron. Add tolerance, specify 280 micron minimum.

Alternative: hot-dip galvanizing at 85 micron average (ASTM A123 for structural shapes > 6 mm thick) plus a single coat of polyurethane topcoat at 75 micron. Total system = 160 micron. Galvanizing provides cathodic protection, so the system outperforms a 280 micron paint system in C5 conditions because the zinc sacrificially protects the steel at scratches and edges. Expected maintenance interval: 30+ years in C4, 15-25 years in C5.

Code comparison — surface preparation and coating

Aspect	ASTM/SSPC (US)	EN ISO (Europe)	AS/NZS (Australia)	CSA (Canada)
Surface prep standard	SSPC-SP 1 through SP 16	ISO 8501-1 (Sa, St grades)	AS 1627 (series)	SSPC (same as US)
Blast cleanliness	SP 5/6/10	Sa 1/2/2.5/3	AS 1627.4 (Sa 2.5 typical)	SP 5/6/10
Profile measurement	ASTM D4417 (replica tape)	ISO 8503 (comparator)	AS 3894.5	ASTM D4417
Galvanizing	ASTM A123	EN ISO 1461	AS/NZS 4680	CSA G164
Corrosivity categories	— (use ISO 12944)	ISO 12944-2	AS/NZS 2312.1	— (use ISO 12944)
Coating system selection	SSPC Paint Guide 16	ISO 12944-5	AS/NZS 2312.1	CGSB 1-GP-CP

North America uses SSPC surface prep grades. Europe uses ISO 8501-1 (Sa grades). Both systems are equivalent and cross-referenced.

Common mistakes to avoid

Specifying SP 6 (commercial blast) for a high-performance system. Zinc-rich primers require SP 10 minimum. Applying zinc-rich epoxy over SP 6 preparation leads to pinpoint rusting within 3-5 years as the remaining mill scale undercuts the primer.
Ignoring surface profile depth. A profile that is too shallow (< 25 micron) with a thick-film epoxy system leads to adhesion failure. A profile that is too deep (> 100 micron) with a thin primer allows peaks to rust through the coating.
Failing to re-blast rusted surfaces before overcoating. Power tool cleaning (SP 3) over old rust leaves rust at the steel surface. The overcoat bonds to rust, not to steel. When the rust flake fails, the entire overcoat system comes off.
Not accounting for galvanizing distortion. Hot-dip galvanizing at 450 degrees C can warp thin plates, bow long members, and crack welds in restrained assemblies. Vent holes, symmetrical dipping, and stress-relief are required for large fabrications.
Using weathering steel in marine environments. The protective patina never stabilizes in the presence of chlorides. Structures within 1 km of coastline (and certainly within 200 m) should use painted or galvanized carbon steel instead.
Applying alkyd (oil-based) primers over galvanizing. Alkyd resins saponify in contact with zinc, producing a soapy film that causes delamination. Use water-based or epoxy primers specifically formulated for galvanized surfaces.

Frequently asked questions

What surface preparation is required for structural steel? Most building applications require SSPC-SP 6 (commercial blast) minimum. For zinc-rich primers, marine environments, or high-durability systems, SSPC-SP 10 (near-white blast) is required. Interior dry environments may accept SSPC-SP 3 (power tool cleaning) for maintenance.

How long does galvanizing last? In C2 (rural/dry interior): 75-100+ years to first maintenance. In C3 (urban): 50-75 years. In C4 (industrial): 25-40 years. In C5 (marine): 15-25 years. Galvanizing life is approximately linear with coating thickness.

What is the difference between galvanizing and painting? Galvanizing provides cathodic (sacrificial) protection. The zinc corrodes preferentially, protecting the steel even at scratches and edges. Paint provides barrier protection. If the paint film is breached, corrosion begins immediately at the defect. Galvanizing is more durable but has size limitations and aesthetic constraints.

Can I paint over galvanized steel? Yes, this is called a duplex system and provides excellent long-term protection. Use an etch primer or wash primer specifically designed for galvanized surfaces, then apply standard epoxy/polyurethane system. Never use alkyd primers over zinc.

What is the cost comparison between coating systems? Relative cost per sqm (C3 environment, 25-year life): alkyd system = 1.0x, epoxy system = 1.5x, zinc-rich epoxy system = 2.0x, hot-dip galvanizing = 2.5x, galvanizing + paint (duplex) = 3.5x, thermal spray aluminum = 5.0x. Higher initial cost often means lower life-cycle cost.

When should I use intumescent paint? When steel is architecturally exposed and the required fire rating is R60 or less. Intumescent coatings expand 20-50x under fire, forming an insulating char. For ratings above R60, board or spray-applied cementitious fireproofing is usually more economical. Intumescent is also preferred where weight and space constraints make board impractical.

Surface preparation standards — detailed reference

SSPC/NACE preparation grades — complete reference

SSPC Grade	NACE Grade	Method	Description	When Required	Result
SP 1	--	Solvent	Removes oil, grease, dirt, and salts	Before any blast or paint	Clean, dry surface
SP 2	--	Hand tool	Wire brushing, scraping, sanding	Small maintenance areas	Loose mill scale and rust removed
SP 3	--	Power tool	Grinding, power wire brush, needle gun	Touch-up, small areas	Tight mill scale remains
SP 6	NACE 3	Commercial blast	2/3 of surface free of visible residue	Alkyd and epoxy systems	Moderate profile, some staining
SP 7	NACE 4	Brush-off blast	All loose mill scale/rust removed	Recoating over intact coating	Minimal profile
SP 10	NACE 2	Near-white blast	95% of surface free of residue	Zinc-rich primers, immersion	Clean with slight staining
SP 5	NACE 1	White metal blast	100% of surface free of residue	Critical immersion, TSA	Completely clean steel
SP 11	--	Power tool to bare metal	Produces 1 mil minimum profile	Where blasting is impractical	Bare metal with profile
SP 15	NACE 5	Commercial blast (enhanced)	90% of 1 sq ft area clean	Mid-tier coatings	Between SP 6 and SP 10

Coating systems comparison table

System	Primer DFT	Intermediate DFT	Topcoat DFT	Total DFT	Expected Life (C3)	Relative Cost
Alkyd economy	40 micron	--	40 micron	80 micron	8-12 years	1.0x
Epoxy standard	75 micron	100 micron	50 micron	225 micron	15-20 years	1.5x
Zinc-rich epoxy	75 micron	125 micron	50 micron	250 micron	20-25 years	2.0x
Inorganic zinc (IOZ)	75 micron	150 micron	50 micron	275 micron	25-30 years	2.2x
Galvanize only	85 micron	--	--	85 micron	30-50+ years	2.5x
Galvanize + paint (duplex)	85 micron	75 micron	50 micron	210 micron	40-60+ years	3.5x
Thermal spray zinc	200 micron	Sealer	--	200+ micron	40+ years	5.0x
Moisture-cure urethane	75 micron	100 micron	50 micron	225 micron	15-20 years	1.8x
Intumescent (fire rated)	50 micron	500-2000 micron	50 micron	600-2100 micron	15-25 years (non-fire)	4.0x

AESS (Architecturally Exposed Structural Steel) finish categories

AESS is defined in the AISC Code of Standard Practice and requires enhanced visual quality. The AESS Category system (AESS 1 through 4) specifies increasing levels of finish.

Category	Requirements	Typical Location	Cost Premium
AESS 1	Standard fabrication, welds ground smooth	High visibility, > 20 ft away	+10%
AESS 2	Tighter tolerances, all welds ground, no grind marks	Moderate visibility, 6-20 ft	+20%
AESS 3	AESS 2 + plug or cap welds, tight seams, uniform appearance	Close range, < 6 ft	+35%
AESS 4	AESS 3 + surfaces sanded/grinded flush, museum quality	Feature elements, touch range	+50-100%

Galvanizing process overview

Hot-dip galvanizing immerses fabricated steel in molten zinc at approximately 850 deg F (455 deg C):

Caustic cleaning -- removes organic contaminants (oil, grease)
Water rinse -- removes residual caustic
Acid pickling -- hydrochloric or sulfuric acid removes mill scale and rust
Water rinse -- removes residual acid
Flux (ammonium chloride) -- promotes zinc adhesion, prevents oxide reformation
Preheat/dry -- evaporates moisture (prevents zinc splash)
Zinc immersion -- 3-8 minutes at 840-860 deg F (450-460 deg C)
Cooling -- air or water quench

Design considerations for galvanizing:

Provide vent and drain holes in hollow sections (min. diameter = 1/2 in. per ft of diagonal)
Avoid overlapping surfaces that trap air or zinc
Seal-weld all edges of overlapping plates (or leave gaps for drainage)
Avoid asymmetric weldments that warp during thermal cycling
Maximum member length limited by bath dimensions (see table earlier in this document)

Painting systems for structural steel — selection guide

Environment	Design Life	Recommended System	Surface Prep	Priming Coat	Intermediate	Topcoat
Interior dry (C1)	15+ years	Alkyd system	SP 2/3	Alkyd primer (40 mu)	--	Alkyd enamel (40 mu)
Interior humid (C2)	20+ years	Epoxy system	SP 6	Epoxy primer (75 mu)	--	Epoxy topcoat (50 mu)
Exterior rural (C3)	20+ years	Epoxy/PU system	SP 6	Epoxy primer (75 mu)	Epoxy mid (100 mu)	PU topcoat (50 mu)
Industrial (C4)	25+ years	Zinc-rich system	SP 10	Zinc-rich epoxy (75 mu)	Epoxy MIO (125 mu)	PU topcoat (50 mu)
Marine (C5)	25+ years	Organic zinc system	SP 10	Organic zinc (75 mu)	Epoxy MIO (150 mu)	PU topcoat (50 mu)
Offshore (CX)	25+ years	TSA or duplex	SP 5	TSA zinc (200 mu)	Sealer	PU topcoat (50 mu)

Mill scale removal methods

Method	SSPC Equivalent	Result	Profile (mil)	Speed	Cost	Best For
Hand wire brush	SP 2	Loose scale removed	0	Slow	Low	Small areas only
Power wire brush	SP 3	Tight scale weakened	0-0.5	Moderate	Low	Touch-up
Needle gun	SP 3 / SP 11	Scale removed, profile created	1-2	Slow	Low	Tight areas
Dry abrasive blast	SP 6/10/5	Clean to specified grade	1.5-4.0	Fast	Medium	New construction
Wet abrasive blast	SP 6/10	Clean, dust suppressed	1.5-3.5	Fast	Medium+	Dust-sensitive areas
Vacuum blast	SP 6/10	Clean, contained	1.5-3.0	Moderate	High	Enclosed/confined spaces
Ultrahigh-pressure water	SP 12/WJ-1	Clean, no dust, no heat	0-1.0	Moderate	High	Maintenance, delicate areas

Run this calculation

Related references

Disclaimer

This page is for educational and reference use only. It does not constitute professional engineering advice. All design values must be verified against the applicable standard and project specification before use. The site operator disclaims liability for any loss arising from this information.