Acrylithane 2.8

 

Product Data Sheet

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Product characteristics.

Recommended use
Acrylithane 2.8 is recommended for use on automobiles, trucks, trailers, bulk tanks, and chemical trailers that require a premium topcoat appearance.

Service temperature:

• Maximum, dry exposure only: 120°C [248°F].

Features

• Uses same catalyst as Ureprime 2.8 primer.
• Excellent gloss and color retention.
• Chemical resistant.
• Low VOC.
• Wide variety of colors available.

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Product safety

Flash point
29°C [84°F]

VOC content mixed product

Legislation	Value
EU	401 g/L [3.35 lb/US gal]
US (coatings)	331 g/L [2.76 lb/US gal]
US (regulatory)	331 g/L [2.76 lb/US gal]
Canada	331 g/L [2.76 lb/US gal]
China	401 g/L [3.35 lb/US gal]
Hong Kong	401 g/L [3.35 lb/US gal]
Korea	331 g/L [2.76 lb/US gal]

According to EPA Method 24. 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
643JB

Product components
Base 643J9
Curing Agent 941JB

Standard shade / code
White 10000 *
Wide range of colours is available via Hempel’s tinting system.

Gloss
High-gloss

Volume solids
57 ± 2%

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

Reference dry film thickness
50 micron [2.0 mils]

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Surface preparation

Cleanliness

• According to Hempel’s Specification.

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

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Application

Mixing ratio
Base 643J9 : Curing Agent 941JB
(3 : 1 by volume)

Stir well before use.

Thinner
Hempel’s Thinner 08320

Cleaner
Hempel’s Tool Cleaner 99610

Pot life

Product temperature	Pot life
20°C [68°F]	4 hours

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Application method

Tool	Thinning max vol.	Application parameters
Airless spray	10%	Nozzle pressure: 138 bar [2000 psi] Nozzle orifice: 0.011-0.013″
Air spray	Not Applicable

Thinning may be necessary in the case of very long spray hoses and/or paint temperatures below 15°C/59°F. This will cause lower film build and longer drying time. Alternate reducers such as acetone may be used to reduce product without adding VOC.
Add 08EJB (21102 Fast Spray Reducer) as required. When temperature is over 20°C/68°F, use 08320 (JB 21092 Medium Reducer). Add 08BJB (JB 21093 Slow Reducer) to reduce dry spray and orange peel, if required. 085JB (JB 21078 Special Urethane Retarder) can be added to help add a wet edge for spraying large parts.

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Film thickness

Specification range	Low	High	Recommended
Dry film thickness	38 micron [1.5 mils]	75 micron [3.0 mils]	50 micron [2.0 mils]
Wet film thickness	67 micron [2.7 mils]	132 micron [5.3 mils]	88 micron [3.5 mils]
Theoretical spreading rate	15 m²/L [611 sq ft/US gal]	7.6 m²/L [310 sq ft/US gal]	11 m²/L [448 sq ft/US gal]

Product may be specified in another film thickness depending on purpose and area of use.

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Application conditions

• Apply on a clean and dry surface with a temperature at least 3°C [5°F] above the dew point.
• Provide adequate ventilation during application and drying.
• Surface temperature must be above 7°C [45°F] and below 44°C [111°F] during application and curing.
• Temperature of product must be above 15°C [59°F] during application.

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Application remarks

• Two coats of the topcoat may be necessary to obtain full hiding power.

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Drying and overcoating

Product compatibility

• Previous coat: Ureprime 2.8, Chem-O-Gard Low VOC Primer, Chem-O-Pon Epoxy Primer.
• Subsequent coat: Acrylithane 2.8 or as per Hempel specification.

Drying time

Surface temperature	Touch dry	Surface dry	Hard dry	Fully cured
20°C [68°F]	60 min	3 hrs	4 hrs	7 days
48°C [118°F]	–	–	2 hrs	–
65°C [149°F]	–	–	1 hr	–

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Drying conditions

• Maintain sufficient ventilation during application, drying, and curing.
• Avoid condensation on freshly applied coating.

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Overcoating details

• Surface must be clean before overcoating.
• If maximum interval exceeded, roughen surface to ensure adhesion.

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Storage

Shelf life

Ambient temperature	Base	Curing Agent
25°C [77°F]	36 months	12 months

Other remarks

– Addition of 99056 accelerator (JB 99011) at the rate of 1.0 fl. /oz. per mixed gallon will shorten dry times to spray overcoat at 2 hoursand to touch at 2.5 hours.
– Addition of 99056 of 2.0 oz. per mixed gallon will result in an overcoat time of 1.5 hours and to touch in 2 hours.
– Overcoating interval: Minimum 3 hours; maximum 2 weeks. Low temperature, high humidity, poor ventilation, and thick films will retard drying.
– DTM Additive: Recommended dosage is minimum 5% to 10% byvolume. Mix thoroughly to incorporate the additive before application.
– Hempel’s Specification supersedes any recommendations given in the Product Data Sheets

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Carbon Footprint

Dry film thickness	GWP (g CO₂e/m²)	GWP (lb CO₂e/ft²)
1 µm / 1 mil	12.2	0.063

Scope includes raw materials, inbound transport, manufacturing, and VOC emissions. Values may vary with shade.

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References

Product Data Sheet – Acrylithane 2.8
Issued by Hempel A/S – January 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.