Hempaline Defend 740

Product safety

Flash point: 28°C [82°F]

VOC content mixed product

Legislation	Value
EU	40 g/L [0.33 lb/US gal]
US (coatings)	40 g/L [0.33 lb/US gal]
US (regulatory)	40 g/L [0.33 lb/US gal]
China	40 g/L [0.33 lb/US gal]

According to specific legislation. See Explanatory Notes at hempel.com or your local Hempel website.

Handling
Handle with care. Observe safety labels and follow local/national regulations.
Always consult Hempel’s Safety Data Sheet along with the Product Data Sheet.
For professional use only.

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Product data

• Product code: 17120
• Base: 17129
• Curing Agent: 9580A
• Standard shade: Light beige 15974
• Gloss: Semi-gloss
• Volume solids: 100%
• Specific gravity: 1.3 kg/L [11 lb/US gal]
• Reference dry film thickness: 500 micron [20 mils]

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Surface preparation

Cleanliness

• Remove oil, grease using detergent.
• Remove salts and contaminants via high-pressure fresh water.
• For concrete: see Hempel’s Specification.

New build

• Abrasive blasting to min. Sa 2½ (ISO 8501-1) / SP 10 (SSPC).
• Remove dust and loose materials.

Roughness

• Surface profile Medium (G) (ISO 8503-2)

Refer to Hempel’s Surface Preparation Guidelines.

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Application

Mixing ratio: Base 17129 : Curing Agent 9580A (49 : 1 by volume)
Stir well before use. Thinning not allowed.

Thinner: None
Cleaner: Hempel’s Thinner 08960

Pot life

Temp	Pot life
10°C [50°F]	60 min
20°C [68°F]	40 min
30°C [86°F]	25 min

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Application method

Tool	Thinning	Parameters
Airless spray	None	Pressure: 200 bar [2900 psi], Nozzle: 0.025–0.048″

As tank lining, brush/roller use is for stripe coating or touch-up only. Heavy-duty spray equipment needed. Keep hoses short. Pressure based on 20°C material.

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Film thickness

Category	DFT	WFT	Spreading rate
Low	400 µm [16 mils]	401 µm [16 mils]	2.5 m²/L [102 sq ft/US gal]
High	1000 µm [40 mils]	1001 µm [40 mils]	1 m²/L [41 sq ft/US gal]
Recommended	500 µm [20 mils]	501 µm [20 mils]	2 m²/L [81 sq ft/US gal]

Thickness may vary depending on use case. This affects drying, curing, and coverage.

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Application conditions

• Optimal paint temperature: 20–25°C [68–77°F]
• Surface must be 3°C above dew point and >10°C [50°F]
• Ensure surface is clean and dry

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Application remarks

• Although solids = 100%, some reactive volatiles may evaporate.
• Curing contraction also affects volume.
• Use 85% practical volume solids for estimating coverage.

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Drying and overcoating

Product compatibility

• Previous coat: None or as per specification. Suggested: Hempaline Prepare 120
• Next coat: None or as per specification. Suggested: Hempaline Defend 740

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Drying time

Surface temperature	10°C [50°F]	20°C [68°F]	30°C [86°F]	35°C [95°F]
Surface dry (h)	7	4	2.5	2
Hard dry (h)	–	7	–	–
Through dry (h)	13	8	5	4
Walkable (h)	24	15	10	8
Fully cured (h)	72	34	21	16

Based on 500 µm [20 mils] DFT under standard conditions. See Explanatory Notes.

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Overcoating

Recommended intervals for immersion

Quality name	10°C [50°F]	20°C [68°F]	30°C [86°F]
Hempaline Defend 740	– / –	– / –	– / –

No defined overcoating window listed; follow Hempel’s specification.

Overcoating details

• If max interval is exceeded, sweep blast required
• Surface must be clean and dry before coating

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Other remarks

• Hempel’s Specification supersedes any PDS suggestions.

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Storage

Temp	Base shelf life	Curing Agent shelf life
25°C	6 months	6 months

Store in original, unopened containers below 40°C. Reinspect after shelf life.

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Carbon Footprint

Thickness	GWP (CO₂e)
1 µm	7.2 g CO₂e/m²
1 mil	0.037 lb CO₂e/ft²

Includes raw materials, production, VOCs. Based on standard shade. Values may vary.

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References

Product Data Sheet – Hempaline Defend 740
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.