Hemudur 18500

 

PRODUCT DATA SHEET

 

PRODUCT CHARACTERISTICS

Recommended use

As a general purpose primer on steel constructions (see REMARKS overleaf).

Service temperature:

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

Certificates / Approvals

• Third-party verified, product-specific Environmental Product Declaration (Type III EPD, ISO 14025, EN 15804)
• Meets requirements to NORSOK M-501 when used as part of a predefined paint system. Edition 6, System 1. Edition 7, System 1B.
• Meets requirements to ISO 12944 when used as part of a predefined paint system. Part 6, C4 High.

Features

• Can contribute to points for LEED projects (Low-emitting materials, Environmental Product Declarations).
• Can contribute to credits for BREEAM projects (Indoor air quality, Lifecycle impacts).
• Suited for DGNB System projects.

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PRODUCT SAFETY

Flash point

67°C [153°F]

VOC content mixed product

Legislation	Value	% thinning, by volume
EU	22 g/L [0.18 lb/US gal]	140
US (coatings)	22 g/L [0.18 lb/US gal]
US (regulatory)	70 g/L [0.58 lb/US gal]
China	22 g/L [0.18 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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PRODUCT DATA

Product code: 18500
Product components: Base 18509, Curing Agent 97710
Standard shade / code: Light grey 12170
Gloss: Semi-flat
Volume solids: 50 ± 2%
Specific gravity: 1.4 kg/L [11 lb/US gal]
Reference dry film thickness: 75 micron [3.0 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.

Maintenance and Repair

• Spot abrasive blasting to min. PSa 2½ (ISO 8501-2) / SP 10 (SSPC).
• Minor areas can be cleaned by power tool to St 2 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 18509 : Curing Agent 97710 (2 : 3 by volume)
Stir well before use.

Thinner

Fresh water

Cleaner

Hempel’s Cleaner 98701

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POT LIFE

Product temperature	Pot life
15°C [59°F]	30 min
20°C [68°F]	60 min

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APPLICATION METHOD

Tool	Thinning max vol.	Application parameters
Airless spray	5%	Nozzle pressure: 150 bar [2200 psi]
		Nozzle orifice: 0.015-0.019″
Brush	5%	Not Applicable.

If brush or roller application is used, more coats will be necessary to achieve the specified dry film thickness. For brush or roller application use Hemucryl Brush Agent 99810. 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	50 micron [2.0 mils]	120 micron [4.8 mils]	75 micron [3.0 mils]
Wet film thickness	99 micron [4.0 mils]	238 micron [9.5 mils]	149 micron [5.9 mils]
Theoretical spreading rate	10 m²/L [407 sq ft/US gal]	4.2 m²/L [171 sq ft/US gal]	6.7 m²/L [273 sq ft/US gal]

Overthickness must be closely controlled and never locally exceed 160 micron [6.4 mils] DFT. On irregular surfaces it is recommended to employ special care in avoiding over application.

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APPLICATION CONDITIONS

• 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 [50°F] during application and curing.
• Relative humidity must be below 80% during application and curing.

DRYING AND OVERCOATING

Product compatibility

• Previous coat: None or according to Hempel’s specification.
  Recommended products are: Hempadur Avantguard 750 1736G, Hempadur Avantguard 770 17382
• Subsequent coat: According to Hempel’s Specification.
  Recommended products are: Hemuthane Enamel 58510, Hemuthane WB Top 58530/1, Hemucryl Enamel HI-Build 58030

Drying time

Surface temperature	Surface dry	Hard dry	Fully cured
20°C [68°F]	min 120	4 hours	7 days

Determined for dry film thickness 75 micron [3.0 mils] at standard conditions, see Hempel’s Explanatory Notes for details.

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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]
Hemudur 18500	Min: 10 h	Min: 4 h	Min: 2 h
	Max: Ext*	Max: Ext*	Max: Ext*
Hemucryl Enamel HI-Build	Min: 15 h	Min: 6 h	Min: 3 h
	Max: 17 d	Max: 7 d	Max: 3½ d

*Ext: Depending on the actual exposure conditions, the coated surface is overcoatable for an extended period of time. Contact your local Hempel representative for advice.
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.
• 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]	12 months	12 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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STORAGE CONDITIONS

• Temperature must not go below 5°C [41°F] during transport and storage.

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CARBON FOOTPRINT

Dry film thickness	1 µm	1 mil
GWP (Global Warming Potential)	9.5 g CO₂e/m²	0.049 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 – Hemudur 18500
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.