Hempadur Avantguard 550

Product characteristics

Recommended use
Hempadur Avantguard 550 is recommended as a versatile primer for long-term protection of steel in severely corrosive environments.

Service temperature:

• Maximum, dry exposure only: 160°C [320°F].

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Certificates / Approvals

• Meets requirements to ISO 12944 when used as part of a predefined paint system. Part 6 C5 Very High.
• Reaction to fire tested (as part of a coating system with approved primer and topcoat) according to EN13501-1 B-s1, d0.

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Features

• Reduces the effect of corrosion and provides very good galvanic protection.
• Fast drying primer with short minimum overcoating intervals.
• Excellent mechanical strength, also in cyclic temperatures, with improved tolerance to high film thickness through high flexibility and self-healing effect.
• Superior tolerance to high relative humidity during application.
• Cures down to -10°C [14°F].

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Product safety

Flash point: 29°C [84°F]

VOC content mixed product

Legislation	Value
EU	325 g/L [2.71 lb/US gal]
US (coatings)	325 g/L [2.71 lb/US gal]
US (regulatory)	325 g/L [2.71 lb/US gal]
China	325 g/L [2.71 lb/US gal]

According to specific legislation, see details in the Explanatory Notes available at Hempel website, hempel.com or at your local Hempel website.

Handling
Handle with care. Before and during use, observe safety labels on packaging and paint containers and follow all local and national safety regulations. Always consult Hempel’s Safety Data Sheet for this product along with the Product Data Sheet.
For professional use only.

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Product data

• Product code: 1734G
• Product components: Base 1734U, Curing Agent 97043
• Standard shade / code: Grey 19840
• Gloss: Flat
• Volume solids: 65 ± 2%
• Specific gravity: 1.9 kg/L [16 lb/US gal]
• Reference dry film thickness: 60 micron [2.4 mils]

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Surface preparation

Cleanliness

• Remove oil, grease and other contaminants by suitable detergent cleaning.
• Remove salts, detergents and other contaminants by high pressure fresh water cleaning.

New build:

• Abrasive blasting to min. Sa 2½ (ISO 8501-1) / SP 10 (SSPC).
• Remove dust, blast media and loose materials.

Roughness

• Surface profile Medium (G) (ISO 8503-2)

Consult Hempel’s separate Surface Preparation Guidelines for more details.

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Application

Mixing ratio
Base 1734U : Curing Agent 97043 (4 : 1 by volume)

Products containing floating or settling particles/pigments need to be continuously stirred during application. This is especially important in case of heavy thinning.

Thinner

• Below 20°C [68°F]: Hempel’s Thinner 08960
• Above 20°C [68°F]: Hempel’s Thinner 08450

Cleaner

• Hempel’s Tool Cleaner 99610

Pot life

Product temperature	Pot life
0°C [32°F]	6 hours
20°C [68°F]	3 hours
40°C [104°F]	1 hour

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Application method

Tool	Thinning max vol.	Application parameters
Airless spray	10%	Nozzle pressure: 220 bar [3200 psi]
		Nozzle orifice: 0.017-0.021″

If brush or roller application is used, more coats will be necessary to achieve the specified dry film thickness. Spray data are indicative and subject to adjustment. Pressure is for a material temperature of 20°C [68°F].

Film thickness

Specification range	Dry film thickness	Wet film thickness	Theoretical spreading rate
Low	40 micron [1.6 mils]	62 micron [2.5 mils]	16 m²/L [652 sq ft/US gal]
High	100 micron [4.0 mils]	154 micron [6.2 mils]	6.5 m²/L [265 sq ft/US gal]
Recommended	60 micron [2.4 mils]	92 micron [3.7 mils]	11 m²/L [448 sq ft/US gal]

Overthickness must be closely controlled and never locally exceed 200 micron [8.0 mils] DFT. On irregular surfaces it is recommended to employ special care in avoiding over application.

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Application conditions

• Temperature of product must be above 15°C [59°F] during application.
• To avoid condensation, apply on a clean and dry surface with a temperature that is at least 3°C [5°F] above the dew point.
• Surface temperature must be above -10°C [14°F] and below 40°C [104°F] during application and curing.

Relative Humidity:

• Must be below 95% during curing and application.

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Drying and overcoating

Product compatibility

• Previous coat: None
• Subsequent coat: According to Hempel’s Specification

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Drying time

Surface temperature	Touch dry (min)	Hard dry (hours)
-10°C [14°F]	70	6
0°C [32°F]	40	4
20°C [68°F]	15	1½
40°C [104°F]	5	½

Determined for dry film thickness 60 micron [2.4 mils] at standard conditions, see Hempel’s Explanatory Notes for details.

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Overcoating

Quality name	-10°C [14°F]	0°C [32°F]	20°C [68°F]	40°C [104°F]
Atmospheric medium
Hempaprime Multi 500 Winter	Min – Max –	–	–	–
Hempathane HS 55610	Min – Max –	–	–	–
Atmospheric severe
Hempaprime Multi 500 Winter	Min – Max –	–	–	–
Hempathane HS 55610	Min – Max –	–	–	–

Overcoating times are indicative for products of the same generic chemistry.
Consult Hempel’s specification for more information.

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Drying conditions

• To obtain the drying time stated, it is important to maintain sufficient ventilation during application, drying and curing.
• Condensation on the freshly applied coating should be avoided.

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Overcoating details

• If the maximum overcoating interval is exceeded, roughening of the surface is necessary to ensure intercoat adhesion.
• Remove zinc salts or other contamination before overcoating.
• The surface must be dry and clean prior to application.

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Other remarks

• Hempel’s Specification supersedes any recommendations given in the Product Data Sheets.

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Storage

Ambient temperature	Base shelf life	Curing Agent shelf life
25°C [77°F]	12 months	36 months

Shelf life from date of production, when stored in original, unopened containers. Thereafter, the product quality must be re-inspected. Storage at elevated temperatures may reduce shelf life. For advice, please consult Hempel.

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Carbon Footprint

Dry film thickness	GWP (Global Warming Potential)
1 µm	14.7 g CO₂e/m²
1 mil	0.077 lb CO₂e/ft²

Includes raw materials, in-bound transport, production, and emitted VOCs.
Calculated based on the standard shade defined in this PDS. Values may vary.

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References

Product Data Sheet – Hempadur Avantguard 550
Issued by Hempel A/S – May 2025
Document Version: 4/4
Source: https://www.hempel.com

Technical Guidelines and Explanatory Notes
Last accessed: 28 May 2025
Reference link: https://www.hempel.com/service-and-support/technical-guidelines

Note: Always consult the latest version of the Product Data Sheet and associated documents directly from Hempel’s official website to ensure accuracy and compliance with the most current recommendations