SIGMASHIELD 420 LT

SIGMASHIELD 420 LT

SIGMASHIELD 420 LT

Product catalog summary
Description: SIGMASHIELD 420 LT is a two-component, high solids epoxy coating designed for cargo tanks and storage tanks, with excellent abrasion, impact, and water resistance. It cures at temperatures as low as -10°C and is available in grey and redbrown colors.
Principal Characteristics: The coating offers high resistance to abrasion and impact, outstanding water resistance, and ease of cleaning. It is suitable for use in underwater and boottop systems.
Basic Data at 10°C: The mass density is 1.6 g/cm³, with volume solids of 81 ± 2%. The VOC content is a maximum of 123 g/kg. Recommended dry film thickness ranges from 125 to 200 μm, with a theoretical spreading rate of 5.4 m²/l for 150 μm thickness.
Recommended Substrate Conditions and Temperatures: The substrate temperature should be between -10°C and 15°C during application and curing, with a maximum relative humidity of 85%.
System Specification: The mixing ratio by volume is 75:25 (base to hardener). The temperature of the mixed components should be above 5°C for optimal application.
Instructions for Use: Induction time is 1 hour at 10°C. Pot life varies with temperature, being 2 hours at 5°C and 1 hour at 10°C. Different application methods (airless spray, air spray, brush/roller) have specific thinner recommendations and nozzle specifications.
Overcoating and Curing: Overcoating intervals vary with temperature, with a minimum of 4 hours at 15°C for epoxy coatings. Full cure times also vary, with 5 days required at 10°C for full cure.
Safety Precautions: The product is solvent-borne, requiring precautions to avoid inhalation and contact with skin or eyes. Adequate ventilation is necessary during application and curing.
Limitations and Liability: The data provided is based on laboratory tests and is intended for guidance. PPG Protective & Marine Coatings does not accept liability for the use of the product, and users must determine its suitability for their needs.
See more

Catalog excerpts

SIGMASHIELD 420 LT-1

two component reinforced high solids polyamine adduci cured epoxy coating PRINCIPAL CHARACTERISTICS - coating for cargo tanks of bulk- or oil carriers and storage tanks build coat for underwater- and boottop systems cures at temperatures down to -10°C excellent abrasion and impact resistance outstanding (sea)water resistance grey, redbrown (other colours on request) - gloss Mass density Volume solids Recommended dry film thickness Theoretical spreading rate Overcoating interval Full cure after Shelf life (cool and dry place) (data for mixed product) SUBSTRATE CONDITIONS previous coat; (e.g. SigmaCover 280 (LT) or SigmaShield 220 (LT)) dry and free from ice and any contamination substrate temperature should be between -10°C up to 15°C during application and curing and at least 3°C above dew point and free from ice during application and curing a substrate temperature down to -10°C is possible, but curing to hardness takes longer and complete resistance will be reached when temperature increases maximum relative humidity during application and curing is 85% Marine Coatings

 Open the catalog to page 1
SIGMASHIELD 420 LT-2

SYSTEM SPECIFICATION Induction time mixing ratio by volume: base to hardener 75 : 25 - the temperature of the mixed base and hardener should preferably be above 5°C, otherwise extra solvent may be required to obtain application viscosity - too much solvent results in reduced sag resistance and slower cure - thinner should be added after mixing the components AIRLESS SPRAY Recommended thinner Nozzle orifice Nozzle pressure Recommended thinner Nozzle orifice Nozzle pressure Recommended thinner 5 -10%, depending on required thickness and application conditions CLEANING SOLVENT SAFETY PRECAUTIONS...

 Open the catalog to page 2
SIGMASHIELD 420 LT-3

with epoxy coatings with polyurethanes Overcoating table for SigmaShield 420 LT for dft up to 150 urn 48 hours 24 hours 10 hours 5 hours 4 hours 72 hours 48 hours 36 hours 24 hours 16 hours 28 days 28 days 28 days 14 days 10 days - surface should be dry and free from chalking and contamination full cure full cure for cargo hold application: for full cure for hard angular cargoes, please contact your nearest PPG Protective & Marine Coatings sales office adequate ventilation to remove solvent must be maintained during application and curing (please referto sheets 1433 and 1434) should SigmaShield...

 Open the catalog to page 3
SIGMASHIELD 420 LT-4

Explanation to product data sheets Safety indications Safety in confined spaces and health safety Explosion hazard - toxic hazard Safe working in confined spaces Directives for ventilation practice The Information In this data sheet Is based upon laboratory tests we believe to be accurate and Is Intended for guidance only. All recommendations or suggestions relating to the use of the Sigma Coatings products made by PPG Protective & Marine Coatings, whether In technical documentation, or In response to a specific enquiry, or otherwise, are based on data which to the best of our knowledge are reliable....

 Open the catalog to page 4
*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.