Hempadur 15553

1. Product Characteristics

Recommended use
Hempadur 15553 is recommended as a primer for systems on hot dipped galvanized steel, aluminium, mild steel and stainless steel surfaces in moderately to severely corrosive environments.
Hempadur 15553 is also suited in moderate corrosive environments when roughening of the surface is not possible. Please see surface preparation overleaf.

Service temperature:

• Maximum, dry exposure only: 140°C [284°F].

Certificates / Approvals

• EC-type examined as a low flame spread material when used as part of a predefined paint system. Please refer to “Declaration of Conformity” on hempel.com for further details.
• 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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2. Product Safety

Flash point: 30°C [86°F]
VOC content mixed product

Legislation	Value
EU	388 g/L [3.24 lb/US gal]
US (coatings)	388 g/L [3.24 lb/US gal]
US (regulatory)	388 g/L [3.24 lb/US gal]
China	388 g/L [3.24 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. ªEU Directive 2004/42/CE.

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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3. Product Data

• Product code: 15553
• Product components: Base 15557, Curing Agent 98021
• Standard shade / code: Pebble Grey 11320
• Gloss: Flat
• Volume solids: 55 ± 2%
• Specific gravity: 1.5 kg/L [13 lb/US gal]
• Reference dry film thickness: 50 micron [2.0 mils]

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4. 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).
• Stainless steel, aluminium and other non ferric metals and alloys: use non-metallic blast media (corundum, garnet, etc.). Sweep blasting to a uniform dense sharp profile, without blank spots.
• Remove dust, blast media and loose materials.
• In some cases, roughening of the surface is not required for galvanized and stainless steel. Consult Hempel for advice.

Maintenance and Repair

• Abrasive blasting to min. Sa 2 (ISO 8501-1) / SP 6 (SSPC).
• Stainless steel, aluminium and other non ferric metals and alloys: use non-metallic blast media (corundum, garnet, etc.). Sweep blasting to a uniform dense sharp profile, without blank spots.
• Feather edges to sound surrounding coating.
• Remove dust, blast media and loose materials.
• In some cases, roughening of the surface is not required for galvanized and stainless steel. Consult Hempel for advice.

Roughness

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

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

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5. Application

Mixing ratio: Base 15557 : Curing Agent 98021 (3 : 1 by volume)
Stir well before use.

Thinner: Hempel’s Thinner 08450
Cleaner: Hempel’s Tool Cleaner 99610

Pot life:

Product temperature	Pot life
20°C [68°F]	2 hours

Application method

Tool	Thinning max vol.	Application parameters
Airless spray	5%	Nozzle pressure: 175 bar [2500 psi], Nozzle orifice: 0.017-0.019″

If brush or roller application is used, more coats will be necessary to achieve the specified dry film thickness.

Film thickness

Specification	Dry film thickness	Wet film thickness	Theoretical spreading rate
Low	50 micron [2.0 mils]	91 micron [3.6 mils]	11 m²/L [448 sq ft/US gal]
High	80 micron [3.2 mils]	146 micron [5.8 mils]	6.9 m²/L [281 sq ft/US gal]
Recommended	50 micron [2.0 mils]	91 micron [3.6 mils]	11 m²/L [448 sq ft/US gal]

For best performance, avoid excessive film thickness.

Application conditions

• 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] during application and curing.
• Optimal paint temperature: 15–25°C [59–77°F].

Application remarks

• Flash-coat technique is recommended when overcoating porous substrates.

6. Drying and Overcoating

Product compatibility

• Previous coat: None.
• Subsequent coat: According to Hempel’s Specification.
  Recommended products are: Hempadur, Hempathane, Hempatex

Drying time

Surface temperature	Touch dry	Hard dry	Fully cured
20°C [68°F]	min 18	min 90	days 7

Determined for dry film thickness 50 micron [2.0 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 [14°F]	0°C [32°F]	20°C [68°F]
Atmospheric medium
Hempadur 15553	Min 27 h	Min 14 h	Min 3 h
	Max Ext*	Max Ext	Max Ext
Hempathane HS 55610	Min 27 h	Min 14 h	Min 3 h
	Max 90 d	Max 45 d	Max 10 d

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

Drying conditions

• To obtain the drying time stated, maintain sufficient ventilation during application, drying, and curing.

Overcoating details

• If the maximum overcoating interval is exceeded, roughening of the surface is necessary.
• Surface must be clean before overcoating.

Other remarks

• Epoxy coatings may chalk, fade, and discolour. This does not affect performance.
• Hempel’s Specification supersedes any recommendations given in Product Data Sheets.

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7. Storage

Shelf life

Ambient temperature	Base	Curing Agent
25°C [77°F]	9 months	36 months

Shelf life from production date in original, unopened containers. Afterward, re-inspect product quality.
Storage at elevated temperatures may reduce shelf life. Consult Hempel for advice.

Storage conditions

• Store per local legislation, max 40°C [104°F], away from sunlight, rain, and snow.

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8. Carbon Footprint

Dry film thickness	GWP (Global Warming Potential)
1 µm	8.8 g CO₂e/m²
1 mil	0.046 lb CO₂e/ft²

Values based on standard shade in this PDS. Includes raw materials, in-bound transport, manufacturing, and VOC emissions during and after application.

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9. References

• Product Data Sheet – Hempadur 15553
  Issued by Hempel A/S – October 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.