Hempadur Mastic 45881

PRODUCT DATASHEET

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PRODUCT CHARACTERISTICS

Recommended use

Hempadur Mastic 45881 is recommended as a self-primed, surface tolerant paint system, or as an intermediate or a topcoat in heavy duty paint systems where low VOC and high film build are required. The product can be used where extended recoating properties for polyurethane topcoats are requested. It may also be used directly on zinc silicate or spray metallized surfaces. The product can be used for minor repairs in immersed areas.

Service temperature

• Maximum, dry exposure only: 120°C [248°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.
• Complies with US FDA and EU food regulations for contact with dry foodstuff. Consult Hempel for details.

Features

• Versatile.
• High surface tolerance.

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PRODUCT SAFETY

Flash point

39°C [102°F]

VOC content mixed product

Legislation	Value
EU	218 g/L [1.82 lb/US gal]
US (coatings)	218 g/L [1.82 lb/US gal]
US (regulatory)	218 g/L [1.82 lb/US gal]
China	218 g/L [1.82 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: 45881
Product components: Base 45889, Curing Agent 95881
Standard shade / code: Light grey 12170*
Gloss: Semi-gloss
Volume solids: 80 ± 2%
Specific gravity: 1.5 kg/L [12 lb/US gal]
Reference dry film thickness: 125 micron [5.0 mils]

Aluminium shade / code: Aluminium grey 19002*
Gloss: Please consult Hempel’s Guideline on aluminium pigmented coatings.
Volume solids: 72 ± 2%
Specific gravity: 1.3 kg/L [11 lb/US gal]
Reference dry film thickness: 125 micron [5.0 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).
• Concrete: According to Hempel’s Specification.
• Remove dust, blast media and loose materials.

Maintenance and Repair

• Spot abrasive blasting to min. PSa 2 (ISO 8501-2) / SP 6 (SSPC).
• Minor areas may be hand or power tool cleaned instead of abrasive blasting.
• Water jetting to min. Wa 2 (ISO 8501-4).
• Flash rust degree of maximum FR M (ISO 8501-4).
• 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 45889 : Curing Agent 95881 (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	Application parameters
Airless spray	Nozzle pressure: 250 bar [3600 psi], Nozzle orifice: 0.017-0.023″
Brush	Not applicable.
Roller	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]	200 micron [8.0 mils]	125 micron [5.0 mils]
Wet film thickness	125 micron [5.0 mils]	250 micron [10 mils]	157 micron [6.3 mils]
Theoretical spreading rate	8 m²/L [326 sq ft/US gal]	4 m²/L [163 sq ft/US gal]	6.4 m²/L [261 sq ft/US gal]

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. For best performance, avoid excessive film thickness.

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APPLICATION CONDITIONS

• Temperature of product must be above 15°C [59°F] during application.
• Surface temperature must be above 15°C [59°F] during application and curing.
• 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.

Relative Humidity

• Relative humidity must be below 85% during drying and curing.

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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.

Drying time

Surface temperature	Hard dry	Fully cured
20°C [68°F]	4 h	7 d

Determined for dry film thickness 125 micron [5.0 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	20°C [68°F]	30°C [86°F]	40°C [104°F]
Atmospheric medium
Hempadur Mastic 45881	Min: –	–	–
	Max: –	–	–
Hempathane HS 55610	Min: –	–	–
	Max: –	–	–
Atmospheric severe
Hempadur Mastic 45881	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.

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.

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	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	1 µm	1 mil
GWP	6.2 g CO₂e/m²	0.032 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 Mastic 45881
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.