Hempaline Defend 630 Cure 72

PRODUCT DATASHEET

---

PRODUCT CHARACTERISTICS

Recommended use

Hempaline Defend 630 is intended as a high performance tank lining for the storage of a wide range of petrochemicals including (but not limited to) crude oil up to 120°C [250°F], MTBE, produced water, alcohols, aromatic and aliphatic solvents, aviation fuels, gasoline blends, select acidic and caustic chemicals. Shades 36641 (light blue) and 10000 (white) are available for potable water service.

Service temperature

• Maximum, dry exposure only: 150°C [302°F]
• Please contact Hempel for more information
• Please consult the Chemical protection guide at hempel.com

---

PRODUCT SAFETY

Flash point

73°C [164°F]

VOC content mixed product

Legislation	Value
EU	21 g/L [0.18 lb/US gal]
US (coatings)	21 g/L [0.18 lb/US gal]
US (regulatory)	21 g/L [0.18 lb/US gal]
China	21 g/L [0.18 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.

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.

---

PRODUCT DATA

Product code: 37820
Product components: Base 37829, Curing Agent 9782S
Standard shade / code: Light blue 36641
Gloss: Semi-gloss
Volume solids: 100%
Specific gravity: 1.4 kg/L [12 lb/US gal]
Reference dry film thickness: 500 micron [20 mils]

---

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
• Concrete: According to Hempel’s Specification

New build

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

Maintenance and Repair

• According to Hempel’s Specification

Roughness

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

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

---

APPLICATION

Mixing ratio

Base 37829 : Curing Agent 9782S (4 : 1 by volume)
Stir well before use. Thinning is not allowed.

Thinner

No thinning

Cleaner

Hempel’s Tool Cleaner 99610

---

POT LIFE

Product temperature	Pot life
10°C [50°F]	80 min
20°C [68°F]	50 min
30°C [86°F]	20 min

---

APPLICATION METHOD

Tool	Thinning max vol.	Application parameters
Airless spray	No thinning	Nozzle pressure: 200 bar [2900 psi], Nozzle orifice: 0.021-0.029″
Brush/Roller	No thinning	Not Applicable

---

FILM THICKNESS

Specification range	Low	High	Recommended
Dry film thickness	300 micron [12 mils]	750 micron [30 mils]	500 micron [20 mils]
Wet film thickness	300 micron [12 mils]	751 micron [30 mils]	501 micron [20 mils]
Theoretical spreading rate	3.3 m²/L [134 sq ft/US gal]	1.3 m²/L [53 sq ft/US gal]	2 m²/L [81 sq ft/US gal]

---

APPLICATION CONDITIONS

• Optimal paint temperature for proper mixing, pumping and spraying is: 20-25°C [68-77°F]
• 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 10°C [50°F] during application and curing

Relative Humidity

• Must be below 80% during curing

---

DRYING AND OVERCOATING

Product compatibility

• Previous coat: None or according to Hempel’s specification. Recommended product is: Hempaline Prepare 130, Hempaline Prepare 110
• Subsequent coat: None or according to Hempel’s specification. Recommended product is: Hempaline Defend 630

Drying time

Surface temperature	Touch dry	Hard dry	Fully cured
10°C [50°F]	8 h	24 h	7 d
20°C [68°F]	4 h	12 h	3 d
30°C [86°F]	2 h	5 h	2 d
40°C [104°F]	1 h	2½ h	1 d

Overcoating

Hempel’s specification supersedes any guidelines indicated in the overcoating table.

Quality name	10°C [50°F] Min/Max	20°C [68°F] Min/Max	30°C [86°F] Min/Max	40°C [104°F] Min/Max
Immersion — Hempaline Defend 630 Cure 72	Min: 8 h / Max: 30 d	Min: 4 h / Max: 30 d	Min: 2 h / Max: 21 d	Min: 60 min / Max: 14 d

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
• As tank lining, if the maximum overcoating interval is exceeded, roughening of the surface by sweep abrasive blasting is necessary to ensure intercoat adhesion

---

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
• Epoxy coatings have an inherent tendency of chalking, fading and discolouring. This does not affect the performance of the coating

---

STORAGE

Shelf life

Ambient temperature	Base	Curing Agent
25°C [77°F]	12 months	18 months

• Temperature must not go below 5°C [41°F] during transport and storage

---

CARBON FOOTPRINT

Dry film thickness	1 µm	1 mil
GWP	7.7 g CO₂e/m²	0.04 lb CO₂e/ft²

---

REFERENCES

Product Data Sheet – Hempaline Defend 630 Cure 72
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.