Hempadur Mastic 45880

PRODUCT DATASHEET

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PRODUCT CHARACTERISTICS

Recommended use

Hempadur Mastic 45880 is recommended as a self-primed, surface tolerant paint for steel and concrete or as an intermediate or a topcoat in systems where low VOC and high film build are required. The product can be used when extended recoating properties for polyurethane topcoats are required. It may also be used directly on zinc silicate or spray metallised 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.
• Meets requirements to ISO 12944 when used as part of a predefined paint system.
• Reaction to fire tested according to EN13501-1 B-s1, d0.
• Complies with US FDA and EU food regulations for contact with dry foodstuff.
• Complies with EN1504-2 for protection and repair of concrete structures.

Features

• Versatile, can be used for both steel and concrete.
• High surface tolerance.
• Low temperature curing.

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PRODUCT SAFETY

Flash point

25°C [77°F]

VOC content mixed product

Legislation	Value	5% thinning, by volume	Limit value phase II (2010)
EU	217 g/L [1.81 lb/US gal]	248 g/L [2.07 lb/US gal]	500 g/L [4.17 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. 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: 45880
• Product components: Base 45889, Curing Agent 95880
• 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: See Hempel’s guideline
• 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).
• Water jetting to min. Wa 2 (ISO 8501-4).
• Flash rust degree of maximum FR M (ISO 8501-4).
• 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)

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APPLICATION

Mixing ratio

Base 45889 : Curing Agent 95880 (3 : 1 by volume)
Stir well before use.

Thinner

Hempel’s Thinner 08450

Cleaner

Hempel’s Tool Cleaner 99610

Pot life

Product temperature	Induction time	Pot life (spray)	Pot life (brush)
20°C [68°F]	10 min	60 min	1½ hours
15°C [59°F]	15 min	90 min	3 hours
30°C [86°F]	0 min	30 min	1 hour

Application method

Tool	Thinning max vol.	Application parameters
Airless spray	5%	Nozzle pressure: 250 bar [3600 psi], Nozzle orifice: 0.017-0.023″
Air spray	5%	Not applicable
Brush/Roller	5%	Not applicable
Dual feed spray	5%	Nozzle pressure: 221 bar [3200 psi], Nozzle orifice: 0.017-0.023″

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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 [10.0 mils]	156 micron [6.2 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]

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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 [23°F] during application and curing.

Relative Humidity

• Relative humidity must be below 85% during curing.

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DRYING AND OVERCOATING

Drying time

Surface temperature	Surface dry	Hard dry	Fully cured
-5°C [23°F]	36 h	48 h	75 d
0°C [32°F]	20 h	25 h	30 d
20°C [68°F]	2½ h	3½ h	7 d
40°C [104°F]	1 h	1½ h	3 d

Overcoating

Quality name	0°C [32°F] Min / Max	20°C [68°F] Min / Max	30°C [86°F] Min / Max	40°C [104°F] Min / Max
Atmospheric medium Hempadur Mastic 45880	54 h / Ext*	6 h / Ext*	4½ h / Ext*	3½ h / Ext*
Hempathane HS 55610	54 h / Ext*	6 h / Ext*	4½ h / Ext*	3½ h / Ext*
Atmospheric severe Hempadur Mastic 45880	4 d / Ext*	10 h / Ext*	7½ h / Ext*	5½ h / Ext*
Hempathane HS 55610	4 d / 27 d	10 h / 72 h	7½ h / 54 h	5½ h / 40 h

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.

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.

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CARBON FOOTPRINT

Dry film thickness	1 µm	1 mil
GWP	6.2 g CO₂e/m²	0.032 lb CO₂e/ft²

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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.

REFERENCES

Product Data Sheet – Hempadur Mastic 45880
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.