Naftoseal MC-630 Class C

Fuselage Sealant

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.

MC-630 C fulfils the requirements of the EADS Airbus Specification AIMS 04-05-001.

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.

Download Naftoseal MC-630 Class C technical datasheet  

  • Application Life and Cure Time

    (at 23°C/50% r.H.)

    Application Life and Cure Time
    (T=25°C, U.R.=25%)
    NAFTOSEALMin.Application TimeWork LifeTime to Shore A 35
    MC-630 C-22 hoursmin. 3 hoursmax. 12 hours
    MC-630 C-33 hoursmin. 10 hoursmax. 3 days
    MC-630 C-1212 hoursmin. 20 hoursmax. 14 days
    MC-630 C-4848 hoursmin. 168 hoursmax. 56 days
    MC-630 C-6060 hoursmin. 240 hoursmax. 70 days

  • Typical Physical and Application Properties
    Typical Physical and Application Properties
    Viscosity at 23°C,
    Brookfield, Spindel 6
    150±100 Pa s (2 Umin/rpm)
    Mixing ratio by weight10010
    Non-volatile content92 ± 2 %
  • Typical Physical and Performance Properties of Cured Compound
    Typical Physical and Performance Properties of Cured Compound
    Specific gravity1,65 g/ccm max.
    Ultimate Shore A Hardness60 max
    Service TemperaturesDa -55°C a +95°C
    Peel Strength (N/25mm /% Cohesion)
    AdherendConditioningTypical Values
    AL48h/60°C 3 % NaCl solution150 N/25mm – 100%
    PUR Top Coat48h/60°C 3 % NaCl solution150 N/25mm – 100%
    Epoxy Primer48h/60°C 3 % NaCl solution150 N/25mm – 100%
    PUR Top Coat48h/60°C Lubricating oil100 N/25mm – 100%
    Epoxy Primer48h/60°C Lubricating oil100 N/25mm – 100%
  • Surface Preparation

    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).

  • Packaging

    The material is supplied in the following containers

    MC-630, Classe C è disponibile nelle seguenti confezioni:
    DesignationBase Compound Content/PieceNo./Case
    Kit 10100 ccm12
    Kit 25250 ccm12
    Kit 50500 ccm12
    Techit 5555 ccm24
    Techit 130130 ccm24
    Unit 1818 litres
    Unit 162162 litres9x18 I Base + 1 x Hardener
    Drum162 litres162 I Base + 1 x Hardener
  • Storage

    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.