Hempadur 4774D

PRODUCT DATASHEET

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Product characteristics

Recommended use
Hempadur 4774D is recommended as a high-build primer, intermediate and/or self-primed finish for high performance, heavy-duty coating systems. Hempadur 4774D is fast curing and therefore suitable when high productivity is key – such as in the Wind segment.

Service temperature:

• Maximum, dry exposure only: 120°C [248°F].

Certificates / Approvals

• Meets requirements to ISO 12944 when used as part of a predefined paint system. Part 6 C5.
• Meets requirements to NORSOK M-501 when used as part of a predefined paint system. Edition 6, System 1. Edition 7, System 1B.

Features

• Heavy duty, abrasion resistant coating.
• Overcoatable by a wide range of epoxy- and polyurethane coatings.
• Low VOC.
• Applicable by standard heavy duty airless spray equipment in a wide range of film thicknesses.

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Product safety

Flash point
34°C [93°F]

VOC content mixed product

Legislation	Value
EU	217 g/L [1.81 lb/US gal]
US (coatings)	217 g/L [1.81 lb/US gal]
US (regulatory)	217 g/L [1.81 lb/US gal]
China	217 g/L [1.81 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. VOC values may vary with shade, please consult the Safety Data Sheet, section 9.

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
4774D

Product components
Base 4774M
Curing Agent 9874D

Standard shade / code*
Light cream 20450 **

Gloss
Semi-gloss

Volume solids
76 ± 2%

Specific gravity
1.5 kg/L [12 lb/US gal]

Reference dry film thickness
150 micron [6.0 mils]

• Other shades are available, please contact your local Hempel representative.
  ** Slight discolouration may occur. This does not affect the performance of the coating.

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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.
• All damage of shopprimer and contamination from storage and fabrication should be thoroughly mechanically/chemically cleaned prior to final painting.

Maintenance and Repair

• Abrasive blasting to min. Sa 2 (ISO 8501-1) / SP 6 (SSPC).
• Minor areas can be cleaned by power tool to St 3 provided the surface is roughened and not polished.
• 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 4774M : Curing Agent 9874D (4 : 1 by volume)
Stir well before use.

Thinner
Hempel’s Thinner 08450

Cleaner
Hempel’s Tool Cleaner 99610

Pot life

Product temperature	20°C [68°F]	15°C [59°F]	30°C [86°F]
Pot life	45 min	60 min	20 min
Pot life (spray)	45 min	60 min	20 min
Pot life (brush)	45 min	60 min	20 min

Application method

Tool	Thinning max vol.	Application parameters
Airless spray	5%	Nozzle pressure: 250 bar [3600 psi]

           |                    | Nozzle orifice: 0.021-0.025"  

Brush | 5% | Not Applicable.

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].

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Film thickness

Specification range	Low	High	Recommended
Dry film thickness	100 micron [4.0 mils]	250 micron [10 mils]	150 micron [6.0 mils]
Wet film thickness	131 micron [5.3 mils]	329 micron [13 mils]	197 micron [7.9 mils]
Theoretical spreading rate	7.6 m²/L [310 sq ft/US gal]	3 m²/L [122 sq ft/US gal]	5.1 m²/L [208 sq ft/US gal]

For best performance, avoid excessive film thickness. Product may be specified in another film thickness than indicated depending on purpose and area of use. This will alter spreading rate, drying and curing time and overcoating interval.

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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 5°C [41°F] during application and curing.
• Surface temperature must be below 60°C [140°F] during application and curing.

Relative Humidity:

• Relative humidity must be below 85% during application.
• Relative humidity must be below 85% during curing.

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Application remarks

• Product requires heavy duty spray equipment; spray hoses shall be as short as possible.
• The practical consumption factor may vary depending on application conditions, equipment and workmanship.

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Drying and overcoating

Product compatibility

• Previous coat: None or according to Hempel’s specification.
• Subsequent coat: None or according to Hempel’s specification. Recommended products are: Hempadur, Hempathane

Drying time

Surface temperature	10°C [50°F]	20°C [68°F]	30°C [86°F]	40°C [104°F]
Touch dry min	30	15	15	15
Hard dry hours	5	2½	2	1½
Fully cured days	–	7	–	–

Determined for dry film thickness 150 micron [6.0 mils] at standard conditions, see Hempel’s Explanatory Notes for details.

Overcoating
Hempel’s specification supersedes any guidelines indicated in the overcoating table.

Quality name	10°C [50°F]	20°C [68°F]	30°C [86°F]	40°C [104°F]
Atmospheric medium – Hempadur 4774D	Min: 4 h / Max: 60 d	Min: 2 h / Max: 30 d	Min: 90 min / Max: 22 d	Min: 60 min / Max: 15 d
Hempathane HS 55610	Min: 4 h / Max: 14 d	Min: 2 h / Max: 7 d	Min: 90 min / Max: 5½ d	Min: 60 min / Max: 3½ d
Atmospheric severe – Hempadur 4774D	(same values as above)
Hempathane HS 55610	(same values as above)

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.

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Overcoating details

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

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Other remarks

• Epoxy coats have an inherent tendency of chalking in outdoor exposure. This does not affect the performance of the coating.
• Hempel’s Specification supersedes any recommendations given in the Product Data Sheets.

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Storage

Shelf life

Ambient temperature	Base	Curing Agent
25°C [77°F]	36 months	24 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	1 µm	1 mil
GWP (Global Warming Potential)	7 g CO₂e/m²	0.036 lb CO₂e/ft²

The carbon footprint is for 1 square meter / square foot of surface area with a dry film thickness of 1 micron / mil.
The scope includes raw materials, in-bound transport to the Hempel factory, Hempel manufacturing processes, and any Volatile Organic Compounds emitted during and after the application of the product.
It is calculated based on the standard shade defined in this PDS.
Values may vary with shade.

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References

Product Data Sheet – Hempadur 4774D
Issued by Hempel A/S – April 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.