Hempel’s Silvium

PRODUCT DATASHEET

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Product characteristics

Recommended use

Hempel’s Silvium 51570 is recommended as a finishing coat for protection of hot pipelines, exhaust pipes, smokestacks and other hot surfaces on steel and woodwork in mild to moderately corrosive environment, where an aluminium surface or light reflection is desired.

Service temperature

• Maximum, dry exposure only: 200°C [392°F].
• Maximum, dry exposure only (peak): 250°C [482°F].

Certificates / Approvals

• Complies with US FDA and EU food regulations for contact with dry foodstuff. Consult Hempel for details.

Features

• For exterior and interior usage.
• Delivers aluminium surface and light reflection.

Product safety

Flash point

33°C [92°F]

VOC content

Legislation	Value
EU	495 g/L [4.13 lb/US gal]
US (coatings)	495 g/L [4.13 lb/US gal]
US (regulatory)	495 g/L [4.13 lb/US gal]
China	478 g/L [3.99 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. Measured according to GB/T 23985-2009.

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	51570
Standard shade / code	Aluminium grey 19000
Gloss	Glossy
Volume solids	38 ± 2%
Specific gravity	0.9 kg/L [8 lb/US gal]
Reference dry film thickness	25 micron [1.0 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 2 (ISO 8501-1) / SP 6 (SSPC).
• Remove dust, blast media and loose materials.
• Minor areas can be cleaned by power tool to St 2 provided the surface is roughened and not polished.

Maintenance and Repair

• Abrasive blasting to min. Sa 2 (ISO 8501-1) / SP 6 (SSPC).
• 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 Fine (G) (ISO 8503-2).

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

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Application

Mixing ratio

Stir well before use.

Thinner

No thinning

Cleaner

Hempel’s Thinner 08080

Application method

Tool	Thinning max vol.	Application parameters
Airless spray	No thinning	Nozzle pressure: 100 bar [1500 psi], Nozzle orifice: 0.017″
Air spray	No thinning	Not Applicable
Brush	No thinning	Not Applicable

If brush or roller application is used, more coats will be necessary to achieve the specified dry film thickness. Spray application is recommended to achieve a good surface finish. Spray data are indicative and subject to adjustment. Pressure is for a material temperature of 20°C [68°F].

Film thickness

	Low	High	Recommended
Dry film thickness	25 micron	40 micron	25 micron
Wet film thickness	67 micron	106 micron	67 micron
Theoretical spreading rate	15 m²/L	9.4 m²/L	15 m²/L

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.

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

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

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Drying and overcoating

Product compatibility

• Previous coat: According to Hempel’s Specification.
• Subsequent coat: None.

Drying time

Surface temperature	Touch dry min	Hard dry hours
10°C [50°F]	60 min	9 h
20°C [68°F]	30 min	4 h
30°C [86°F]	20 min	2.5 h
40°C [104°F]	15 min	2 h

Determined for dry film thickness 25 micron [1.0 mils] at standard conditions, see Hempel’s Explanatory Notes for details.

Drying conditions

• To obtain the drying time stated, it is important to maintain sufficient ventilation during application, drying and curing.
• Condensation on the freshly applied coating should be avoided.

Overcoating details

• The surface must be dry and clean prior to application.

Other remarks

• 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	GWP
1 µm	13.6 g CO₂e/m²
1 mil	0.071 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 Silvium 51570
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.