Hempadur Avantguard 770

Product characteristics

Description
Hempadur Avantguard 770 is an activated zinc-rich epoxy primer in compliance with the requirements of Level 2, type II in SSPC Paint-20, 2019 and ISO 12944 Part 5, 2018. The product is in full compliance with ASTM D520 type II and EU Directive 2004/42/EC, the Paints Directive on the limitation of volatile organic compounds: subcategory j.

Recommended use
Hempadur Avantguard 770 is recommended as a versatile primer for long-term protection of steel in severely corrosive environments. Particularly suitable for use in maintenance and offshore 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 9 CX.
• Meets requirements to NORSOK M-501 when used as part of a predefined paint system. Edition 6, System 1, 7A, 7B. Edition 7, System 1B.

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Features

• Reduces the effect of corrosion and provides excellent galvanic protection.
• Dries fast and has short minimum overcoating intervals.
• Excellent mechanical strength, also in cyclic temperatures, with improved tolerance to high dry 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: 27°C [80°F]

VOC content mixed product

Legislation	Value
EU	328 g/L [2.74 lb/US gal]
US (coatings)	328 g/L [2.74 lb/US gal]
US (regulatory)	328 g/L [2.74 lb/US gal]
China	328 g/L [2.74 lb/US gal]

According to specific legislation, see Explanatory Notes on hempel.com.

Handling
Handle with care. Observe safety labels. Follow local and national safety regulations. Always consult the Safety Data Sheet along with this Product Data Sheet.
For professional use only.

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Product data

• Product code: 17382
• Base: 17388
• Curing Agent: 98384
• Standard shade / code: Dark grey 10830
• Gloss: Flat
• Volume solids: 66 ± 2%
• Specific gravity: 2.4 kg/L [20 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 using detergent cleaning.
• Remove salts and other contaminants using high pressure fresh water.

New build

• Abrasive blasting to min. Sa 2½ (ISO 8501-1) / SP 10 (SSPC).

Maintenance and Repair

• Abrasive blasting to min. Sa 2 (ISO 8501-1) / SP 6 (SSPC)
• Water jetting to Wa 2½ (ISO 8501-4)
• Power tool cleaning to St 2 or St 3 if roughened
• Remove dust and loose materials

Roughness

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

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Application

Mixing ratio
Base 17388 : Curing Agent 98384 = 4:1 by volume

Thinner

• < 20°C: Hempel’s Thinner 08960
• ≥ 20°C: Hempel’s Thinner 08450

Cleaner

• Hempel’s Tool Cleaner 99610

Pot life

Temperature	Pot life
20°C [68°F]	7 hours
40°C [104°F]	5 hours

Application method

Tool	Max Thinning	Parameters
Airless spray	10%	220 bar, 0.017–0.021″ nozzle
Brush/Roller	10%	Additional coats needed for film thickness

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Film thickness

Category	DFT (micron/mil)	WFT (micron/mil)	Spreading rate m²/L (sq ft/US gal)
Low	40 / 1.6	61 / 2.4	16 / 652
High	100 / 4.0	152 / 6.1	6.6 / 269
Recommended	60 / 2.4	91 / 3.6	11 / 448

Do not exceed 200 micron [8.0 mils]. Use care on irregular surfaces.

Continuing the full content of Hempadur Avantguard 770 with drying, overcoating, storage, and the final References section — fully intact and WooCommerce/WordPress-ready:

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Application conditions

• Product temperature must be above 15°C [59°F]
• Surface temperature: min -10°C [14°F], max 40°C [104°F]
• Surface must be 3°C above dew point
• Relative humidity must be below 95%

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Drying and overcoating

Drying time

Surface Temperature	Touch dry	Hard dry
-10°C [14°F]	120 min	8.5 h
0°C [32°F]	60 min	5.5 h
20°C [68°F]	15 min	2.5 h
40°C [104°F]	5 min	1 h

Based on 60 µm [2.4 mils] DFT. See Hempel’s Explanatory Notes for conditions.

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Overcoating

Quality Name and System	-10°C	0°C	20°C	40°C
Atmospheric medium
Hempaprime Multi 500 Winter	3h / Ext*	90m / Ext*	45m / Ext*	25m / Ext*
Hempathane HS 55610	3h / Ext*	90m / Ext*	45m / Ext*	25m / Ext*
Atmospheric severe
Hempaprime Multi 500 Winter	3h / 90d	90m / 90d	45m / 30d	25m / 7d
Hempathane HS 55610	3h / 90d	90m / 90d	45m / 30d	25m / 7d

*Ext = Extended, depending on exposure. Contact Hempel for more info.
If overcoating time exceeds max, roughening is required.
Remove any zinc salts or contamination.

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Drying conditions

• Ensure proper ventilation
• Avoid condensation on freshly applied coating

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Overcoating details

• Surface must be clean and dry
• Roughen if over maximum overcoating interval
• Use compatible generic systems as per Hempel Specification

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Other remarks

• Hempel’s Specification supersedes this Product Data Sheet

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Storage

Temperature	Base shelf life	Curing agent shelf life
25°C [77°F]	12 months	36 months

Store unopened in original containers. Do not exceed 40°C. Reinspect after expiry.

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Carbon Footprint

Dry Film Thickness	GWP (CO₂e)
1 µm	20.5 g/m²
1 mil	0.107 lb/ft²

Based on standard shade. Includes raw materials, VOCs, production, and shipping.

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References

Product Data Sheet – Hempadur Avantguard 770
Issued by Hempel A/S – November 2024
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