Uniprimer

PRODUCT DATASHEET

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Product safety

Flash point 30°C [86°F]

VOC content

Legislation	Value
EU	519 g/L [4.33 lb/US gal]
US (coatings)	519 g/L [4.33 lb/US gal]
US (regulatory)	519 g/L [4.33 lb/US gal]
China	519 g/L [4.33 lb/US gal]

VOC values may vary with shade, please consult the Safety Data Sheet, section 9. According to specific legislation, see details in the Explanatory Notes available at Hempel website, hempel.com or at your local Hempel website.

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
13140

Standard shade / code*
Light grey 11320

Gloss
Flat

Volume solids
42 ± 2%

Specific gravity
1.3 kg/L [11 lb/US gal]

Reference dry film thickness
50 micron [2.0 mils]

* Other shades are available, please contact your local Hempel representative.

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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).
• All damage of shopprimer and contamination from storage and fabrication should be thoroughly mechanically/chemically cleaned prior to final painting.
• 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 may be hand or power tool cleaned instead of abrasive blasting.
• Remove dust, blast media and loose materials.

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

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Application

Mixing ratio
This product contains heavy particles. Stir well before use.

Thinner
Hempel’s Thinner 08080

Cleaner
Hempel’s Thinner 08080

Application method

Tool	Thinning max vol.	Application parameters
Airless spray	5%	Nozzle pressure: 150 bar [2200 psi]
		Nozzle orifice: 0.019-0.023″
Air spray	10%	Not Applicable.
Brush	10%	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	Dry film thickness	Wet film thickness	Theoretical spreading rate
Low	25 micron [1.0 mils]	59 micron [2.4 mils]	17 m²/L [693 sq ft/US gal]
High	100 micron [4.0 mils]	237 micron [9.5 mils]	4.2 m²/L [171 sq ft/US gal]
Recommended	50 micron [2.0 mils]	118 micron [4.7 mils]	8.4 m²/L [342 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

• 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.

Application remarks

• Stir well before use.

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Drying and overcoating

Product compatibility

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

Drying time

Surface temperature	Surface dry min	Hard dry min
10°C [50°F]	30	90
20°C [68°F]	15	45
30°C [86°F]	10	30
40°C [104°F]	10	24

Determined for dry film thickness 50 micron [2.0 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]	40°C [104°F]
Atmospheric medium
Hempalin Enamel 52140	Min 4 h	2 h	90 min	60 min
	Max 5½ d	72 h	54 h	36 h
Hempatex Enamel 56360	Min 12 h	6 h	4½ h	3 h
	Max Ext*	Ext*	Ext*	Ext*
Hempel’s Uniprimer	Min 12 h	6 h	4½ h	3 h
	Max Ext*	Ext*	Ext*	Ext*

*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.

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.
• Hempel’s Specification supersedes any recommendations given in the Product Data Sheets.

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Storage

Shelf life

Ambient temperature	Product
25°C [77°F]	60 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	9.3 g CO₂e/m²	0.048 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 – Hempel’s Uniprimer
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.