Applications: Sealing fuselages
NAFTOSEAL MC-630 Class C is a two-component, manganese-dioxide cured, liquid polysulphide polymer system designed for interfay surface sealing and wet riveting of fuselage components. It has outstanding resistance to aviation gasoline and jet fuel, as well as resistance to chemicals and petroleum products common to the aircraft industry.
MC-630 Class C maintains its flexibility and bond strength on most metal substrates like aluminium, stainless steel, steel, titanium and many coatings under extremes of temperature, weathering and stress.
MC-630 Class C combines low viscosity, for ease of mixing, with a high thixotropy giving good applicational characteristics. It can be effectively applied by extrusion, by injection gun, or by using a roller coating technique. The low viscosity of MC-630 C means that it is easily squeezed from interfaying surfaces during the assembly process. MC-630 C has a unique „self-filleting“ characteristic.
The above details have been compiled to the best of our knowledge on the basis of thorough tests and with regard to the current state of our long practical experience. No liabilities or guarantees deriving from or in connection with this leaflet can be imputed to us. Reproduction, in whole or in part, only with our express permission.
Application Life and Cure Time
(at 23°C/50% r.H.)
Application Life and Cure Time (T=25°C, U.R.=25%) NAFTOSEAL Min.Application Time Work Life Time to Shore A 35 MC-630 C-2 2 hours min. 3 hours max. 12 hours MC-630 C-3 3 hours min. 10 hours max. 3 days MC-630 C-12 12 hours min. 20 hours max. 14 days MC-630 C-48 48 hours min. 168 hours max. 56 days MC-630 C-60 60 hours min. 240 hours max. 70 days
Typical Physical and Application Properties
Typical Physical and Application Properties base hardener color Beige/cream black Viscosity at 23°C,
Brookfield, Spindel 6
150±100 Pa s (2 Umin/rpm) Mixing ratio by weight 100 10 100 12 100 8 Non-volatile content 92 ± 2 %
Typical Physical and Performance Properties of Cured Compound
Typical Physical and Performance Properties of Cured Compound Color grey Specific gravity 1,65 g/ccm max. Ultimate Shore A Hardness 60 max Service Temperatures Da -55°C a +95°C Peel Strength (N/25mm /% Cohesion) Adherend Conditioning Typical Values AL 48h/60°C 3 % NaCl solution 150 N/25mm – 100% PUR Top Coat 48h/60°C 3 % NaCl solution 150 N/25mm – 100% Epoxy Primer 48h/60°C 3 % NaCl solution 150 N/25mm – 100% PUR Top Coat 48h/60°C Lubricating oil 100 N/25mm – 100% Epoxy Primer 48h/60°C Lubricating oil 100 N/25mm – 100%
To obtain good adhesion, clean surfaces with appropriate solvent (reclaimed solvents should not be used) to remove dirt, grease and processing oils just prior to sealant application. Use rags or paper towels that are free of oil. Always pour solvent on the cloth to avoid contaminating the solvent supply. Clean one small area at a time, quickly wiping it dry before the solvent evaporates to prevent redeposition of oil, wax or other contaminants. Usually, in the case of most epoxy resin primers, surfaces need not be additionally prepared with an adhesion promoter to improve adhesion. PUR and EP topcoats as well as composite components should be pre-treated by the NAFTOSEAL MC-110 Adhesion Promoter.
Cleaning of Equipment
Immediately after use or before the sealant cures, wash equipment and tools with a solvent. NAFTOSOLV FN will completely dissolve uncured, semi-cured and fully cured NAFTOSEAL sealants. It provides a method for completely removing NAFTOSEAL and other polysulphide sealant contamination (see separate Data Sheet).
The material is supplied in the following containers
MC-630, Classe C è disponibile nelle seguenti confezioni: Designation Base Compound Content/Piece No./Case Kit 10 100 ccm 12 Kit 25 250 ccm 12 Kit 50 500 ccm 12 Techit 55 55 ccm 24 Techit 130 130 ccm 24 Pail Unit 18 18 litres Unit 162 162 litres 9x18 I Base + 1 x Hardener Drum 162 litres 162 I Base + 1 x Hardener
The shelf life of NAFTOSEAL MC-630 Class C is 6 months from date of manufacture, when stored at temperatures below 26 °C in its original unopened container. Storage at lower temperatures increases shelf life.
Health and Safety Precautions
See Safety Data Sheet.