Class b sealant

Class b sealant DEFAULT

Sealants

Firewall Sealant
Used for sealing firewall structures. It is elastomeric and is able to withstand intermittent temperatures of up to 2000 deg. F.Mil-S-38249 TypeCS 1900Part A

Part B

Premixed
Aluminum Exterior Sealant
Recommended for sealing external seams, depressions and gaps on aircraft to yield weather tightness and achieve aerodynamic smoothness. Withstands jet fuels and weathering. Available in Application Times of 1/2 hour and 2 hours.DMS 1819C, Mil-S-38228 Cl A, Cl B, STM40-006 Class ACS 2415Part A

Part B

Premixed
Junction Box Sealer
Thixotropic, polysulfide sealant suitable for use in edge seal encapsulation. Easily applied with an extrusion gun or spatula.Flamemaster Specification 8030-01-469-7150CS 3105Part A

Part B
Sealing Compound
For aircraft Structures. Cures at room temperature to a flexible resilient rubber with excellent adhesion to metals. Available Class A and Class B various application times. Colors- Tan or BlackAMS 7124 formerly Mil-S-7124 & Mil-S-7502CS 3201 CLASS A & BPart A Class A

Part B Class A

Part A Class B

Part B Class B

Part B Class A

Part A Class B

Part B Class B
Integral Fuel Tank Sealant
Designed to withstand the attack of sulfur compounds present in jet fuels. Also used as pressurized cabin sealant.AMS-S-8802 formerly Mil-S-8802F
Type IICS 3204 CLASS A, B & CPart A Class A

Part B Class A

Part A Class B

Part B Class B

Part A Class C

Part B Class C

Premixed All
Integral Fuel Tank Sealant
Designed to withstand the attack of sulfur compounds present in jet fuels. Also used as pressurized cabin sealant. This is a rapid curing material.AMS-S-8802 formerly Mil-S-8802F
Type IICS 3204RIntegral Fuel Tank Sealant
Dichromate cured polysulfide base compound. Type-1 AMS-S-8802 material will readily cure in the absence of humidity and therefore ideal for application in dry or desert climates. This material has a higher overall performance then the Type-2 material.AMS-S-8802 (Type I)CS 3205Part A

Part B

Part B
Low Density Pressurized Cabin Sealant
The low specific gravity of 1.00 can result in substantial weight savings over conventional sealant.STM 40 107CS 3210Part A

Part B
Corrosion Inhibitive Sealant
A corrosion inhibitive sealant for use in the sealing and coating of metal components on weapons and aircraft systems for protection against corrosion when subject to contact with water and/or weathering.MIL-PRF-81733CS 3213
Class A, B & CPart A Class A

Part B Class A

Part A Class B

Windshield Sealant
A windshield sealant for use when setting or repairing windshields and transparencies of Glass, Acrylic, or Polycarbonate in composite or metal frames.AMS 3333CS 3247Part A

Access Door Sealant
Used as a strippable fillet for integral fuel tanks and pressurized cabins, as a strippable fillet and as a gasket for removable parts. Available Class A or Class B, 1/2 hr. or 2 hrs.AMS 3284 Type 1
Formerly Mil-S-8784BCS 3330 CLASS A

CS 3330 CLASS BPart A Class A

Part B Class A

Part A Class B

Part B Class B

Part A Class A

Part B Class A

Part A Class B

Part B Class B

Corrosion Inhibitive Access Door Sealant
A non chromate Corrosion inhibiting sealant, used as an access door sealant for integral fuel tanks and pressurized cabins, as a strippable fillet and as a gasket for removable parts.AMS 3284 Type 2CS 3330 Cl CLASS A

CS 3330 Cl CLASS BPart A Class A

Part B Class A

Part A Class B

Part B Class B


Top Coat & Adhesive
Fuel tank, Buna N Type and high bond strength adhesive. Protective coating for synthetic rubber sealant and metal surfaces of integral fuel tanks. Protection against oils, fuels, fresh or salt water, corrosion and weathering.AMS 4383 formerly Mil-S-4383C (2)CS 3600Polythioether Quick Repair Fuel Sealant
Used on aircraft to yield weather tightness and fuel resistant seal. Able to cure at lower temperatures. Faster than standard sealant. CS 5310 Class B-2, CS 5306 Class A & Class B available 1/4 hr. & 1/2 hr. CS 5311 available Class A and Class B, 2 hr. 1/2 hr. and 1/4 hr.AMS 3277 Type I
Formerly Mil-S-29574
AMS 3277 Type II -
No Primer required formerly Mil-S-29574CS 5306Part A Class A

Part B Class A

Class B

Primer


Polythioether Windshield Sealant Fast Cure
High temperature sealant. Developed for the installation and sealing of windshield and transparencies on high-speed aircraft.Flamemaster SpecificationCS 5447Part A

Part B

Primer
High Temperature Fuel Tank & Fuselage
Used for sealing fuel tanks and on aircraft fuselage. Withstands higher temperatures than the standard AMS-S-8802 sealant. Available in Class A or Class B, with various application times.AMS 3276 Formerly Mil-S-83430, FMS 1044, FMS 3055CS 5500 CLASS A

CS 5500 CLASS BPart A Class A

Part B Class A

Part A Class B

Part B Class B

Premixed

Part B Class A

Part A Class B

Part B Class B

Premixed

Corrosion Inhibitive Sealant
Permapol P5 polymer, High temperature, sealant - Non chromated. Will be used to replace Mil-S-81733 in some applications.AMS3265
FMS 3104 Formerly
FMS 3055-1CS 5500 CIPart A Class A

Part B Class A

Part A Class B

Part B Class B
High Temperature Low Density Fuel & Fuselage High temperature resistant Low Density Sealant. Fuel tank and fuselage sealant. Density 1.3Flamemaster Specification Test to AMS 3281CS 5530Aircraft Windshield Sealant
Room Temperature cure, high temperature sealant. Used when installing and sealing windshields and transparencies.Flamemaster SpecificationCS 5547Part A

Part B

Primer
Sours: http://flamemaster.com/sealants

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Old02-05-2013, 05:05 AM
 

Join Date: Oct 2011

Location: Kansas

Posts: 337

DefaultDifference in Class A & Class B Sealants

I was researching MSDS sheets yesterday and found that the only difference listed in Class A and Class B sealants is that the Part A of the Class A has 10% Toluene by weight added. If that's the case, then what some have said of adding <15% Toluene by weight to thin Proseal should be perfectly acceptable, right (or at least <10% anyway)? Reason I ask is that I've contacted Flamemaster and PPG about doing this, and neither said thinning their sealant is acceptable, even though that is apparently what they do to make Class A sealant. I'm guessing that when they do it they are making a known quantity that they have tested, so they can validate the results through testing. When the homebuilder does it, the manufacturer has no control of what someone might do and how it might affect the sealant.

Am I correct? I want to make a final thinned batch of Proseal to paint over the seams and rivets so that I can look at it and say "it won't leak" before closing it up. Proseal is cheap!

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Old02-05-2013, 06:19 AM
 

Join Date: Jan 2006

Location: Winston-Salem, N.C.

Posts: 1,452

Default

You are pretty well correct in your assumption..the OEM will not likely give you data they can't "control". I work with Proseal almost every day..sealing up a 767 rear spar repair as we speak..I use MEK to thin B sometimes, and it works fine.its good practice to save a sample and verify it has fully cured. In the industry, we do timestamped cards that are part of the inspection. Its hard to mess up Proseal unless its old, or you don't mix it thouroghly. The thinning process evaporates out quickly.

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Old02-05-2013, 06:30 AM
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Join Date: Nov 2007

Location: NJ

Posts: 1,747

Default

Only use Class A sealant if you plan to fly above FL 180 while IFR. If you don't plan to fly this high, it is a waste of money and added weight.

Use class B if you plan to fly into busier airports, VFR or IFR, but keep in mind, you will need a specific clearance to enter!

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Old02-05-2013, 01:09 PM
 

Join Date: Mar 2005

Location: SE Florida

Posts: 1,510

Default

What? You didn't mention class C. You are correct that the viscosity of each class is the main difference. The screwy thing is, the viscosity ratings are not intuitive. Class A is "brush on" [thin] sealant. It's used to cover rivet shop heads in fuel tanks and similar. Class C [medium] is what is called for to seal a fuel tank or pressure vessel [pressurized fuselage]. Class B [thick] is the most viscous, and is intended to fill large gaps.
Vans supplies us with class B, because you can thin B to make either C or A. FYI lacquer thinner is 90+% toluene, so it works very well as a thinner. MEK works, but evaporates more quickly. I prefer to use Toluene or lacquer thinner, as Toluene is what the manufacturers use as a thinning agent.
Charlie
PS You can triple the shelf life of ProSeal if you store it in a refrigeration.

 

Old02-05-2013, 08:11 PM
 

Join Date: Oct 2011

Location: Kansas

Posts: 337

Default

Hmmmmm, wish I had read this before now. Just bought a gallon of Toluene on the way home -- smallest quantity I could buy, but I have a quart of Lacquer Thinner on the shelf. A gallon of Toluene will cover me for about 50 lifetimes of building. I tried to see if Xylene was equivalent to Toluene, but never could make that connection. Lacquer Thinner equivalency is good to know.

So, how do you make Class B into Class C, i.e. what % by weight of Toluene would you add, and is there any point in doing it? I figure I'll paint the heck out of the rivets and joints with my homemade Class A and call it good.

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Old02-05-2013, 08:22 PM
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Join Date: Aug 2005

Location: Dallas/Ft Worth, TX

Posts: 6,280

Default

Class C sealants also typically are used when extended application/assembly times are required (C-8, C-24, C-36 etc) these extended set times are not available in the A or B class sealants.

Make sure you do a very thorough preparation before applying a top coat or it will just peel off (does peelng slosh ring a bell?).

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Old02-05-2013, 08:28 PM
 

Join Date: Oct 2011

Location: Kansas

Posts: 337

Default

Quote:

Originally Posted by WaltView Post

Class C sealants also typically are used when extended application/assembly times are required (C-8, C-24, C-36 etc) these extended set times are not available in the A or B class sealants.

Make sure you do a very thorough preparation before applying a top coat or it will just peel off (does peelng slosh ring a bell?).

Walt, if I apply it while the original sealant is still tacky, is that sufficient? What other prep would be required? Sure don't want any peeling going on.

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Lenexa, KS

RV-7A

 

Old02-05-2013, 08:59 PM
 

Join Date: Sep 2007

Location: Los Angeles CA

Posts: 26

DefaultPro Seal & Toluene

Is anybody else concerned that toluene has been used as an octane booster in 100LL since it replaced straight 100 octane? Is Pro Seal supposed to last forever? Mooney owners think their Pro Seal sealant is good for 5 years.
Perhaps builders who fly their airplanes frequently have less trouble with leaks because the fuel stays fresher? I was shocked to discover that toluene was used in 100LL after using it to thin Flamemaster applied to my fuel tanks.

Sincerely,

Craig Evans

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Old02-06-2013, 06:21 AM
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Join Date: Aug 2005

Location: Dallas/Ft Worth, TX

Posts: 6,280

Default

Quote:

Originally Posted by StalldogView Post

Walt, if I apply it while the original sealant is still tacky, is that sufficient? What other prep would be required? Sure don't want any peeling going on.

I would call PPGfor specific application instruction for the sealant you are using.

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EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
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Old02-06-2013, 12:08 PM
 

Join Date: Oct 2011

Location: Kansas

Posts: 337

Default

Quote:

Originally Posted by WaltView Post

I would call PPG for specific application instruction for the sealant you are using.

Walt, thanks for the link. I contacted them and was routed direct to PPG Aerospace Engineering Tech Support for fuel tank sealants. Here is what they said about applying the Class A over Class B.

1. If the Class B is freshly applied and not fully cured, i.e. not necessarily tacky but still pliable, and the Class B is still clean and has not been contaminated, then applying Class A directly over it does not require any further prep. It won't hurt to run a rag with MEK (PPG's recommendation) over it (Acetone will work, but it evaporates faster), but this step is not necessary if you are confident the Class B is still clean. Also wipe down the adjacent metal surfaces with the same solvent as a precautionary measure.

2. If the Class B has cured (approx 7 days), then lightly wipe the surface of the Class B with Scotchbrite, then wipe down with solvent (MEK or Acetone), then apply the Class A over the Class B.

3. In either condition, after the Class A has fully cured (approx 7 days), they recommend verifying good adhesion to be sure both coatings fully adhered. They don't expect anything other than full adhesion if applied as listed above, but this check will provide an additional level of validation. They didn't say exactly how to test this, but some sort of pull test. I will probably just apply the Class A over the Class B batch samples I have curing, then try to delaminate them after the Class A cures.

These steps only apply to virgin applications that have never seen fuel or other contaminants.

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Lenexa, KS

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3M Aerospace Sealants

The main products groups are defined by their application:

  • Integral Fuel Tank Sealants
  • Fuselage / Cabin Pressurization Sealants
  • Repair and Special Application Sealants
  • Adhesion Promoter
  • Plastic packaging & Mixing Equipment

 

Sealant Nomenclature


 

Classes of Aircraft Sealants:

Class A

  • For fasteners and brush-coat sealing
  • Applied with brush

 

Class B

  • For fillet and injection seals
  • mostly non-flowing
  • Applied with sealant gun

 

Class C

  • For faying surface seals
  • Applied using roller or sealant gun

 

Class RV (reduced viscosity)

 

Integral Fuel Tank and Fuselage Sealants

  • AC-236 Class A
  • AC-236 Class B
  • AC-236 Class C
  • AC-240 Class B - Fast Cure
  • AC-275 Class B - High-Temperature
  • AC-350 Class A - Intermediate Density
  • AC-350 Class B - Intermediate Density
  • AC-350 Class C - Intermediate Density
  • AC-360 Class A - Intermedaite Density
  • AC-360 Class B - Intermediate Density
  • AC-370 Class B - Low Density
  • AC-380 Class B

 

Cabin Pressurization / Fuselage Sealants

  • AC-665 Class B - Chromated, Corrosion Inhibitive Sealant
  • AC-665 Class C - Chromated, Corrosion Inhibitive Sealant
  • AC-730 Class B - NON-Chromated, Corrosion Inhibitive Sealant
  • AC-730 Class C - NON-Chromated, Corrosion Inhibitive Sealant
  • AC-735 Class B - Low Density, Non-Chromated Corrosion

 

Access Door Sealants

  • AC-215 Class B - Low Adhesion

 

Repair Sealants

  • AC-250 Class A-1/6 - Quick Repair
  • AC-250 Class B-1/6 - Quick Repair, Low Temperature Curing Sealant

 

Speciality Sealants

  • AC-251 Class B - Black Moldline and Canopy/Windshield Sealant
  • AC-251 Class B - Grey Moldline and Canopy/Windshield Sealant
  • AC-645 Class B -Low Density, Hole Filling, Cavity Sealant


Adhesion Promoters

  • AC-132 for Polysulfides and Polythioether, Metal & Organic Substrates
  • AC-132 Red, for Polysulfides
  • AC-135 Red, for metals, solvent resistant
  • AC-137 Clear, for PC, PMMA, Glass
  • AC-160 Red, water-borne


Mixing and Dispensing Equipment

  • AC-885 Portable Electric Mixer
  • AC-900 Automatic Mixer
  • AC-855 Manual Dispensing Gun
  • Roll-on-Nozzles in 1" and 2" width

 

Sours: https://www.aero-consultants.ch/en/
New 2021 Roadtrek Zion SRT Class B RV featuring an EcoTrek Lithium Package

PRC-DeSoto Class’s Explained

Techcon™ Systems

Fluid dispensing solutions providing an alternate source for many of your current Semco® products.

PRC-DeSoto Products

Aircraft fuel tank, fuselage, windshield, conductive and specialty sealants, industrial sealants and adhesives.

Semco® Packaging and Application Systems

Innovative, clean, safe, and accurate packaging and dispensing solutions for single-and multi-component adhesives, sealants, encapsulants, coatings and lubricants.

RPM Technology

Products for the removal of polysulfide (fuel tank) sealants and silicone sealants.

eOx Cleaners

Aqueous based aircraft and industrial cleaners.

Sealant Removal Wipes

Water wetted wipes for the removal of uncured sealants and adhesives.

Glue Dots

Removable adhesive dots in a convenient dispenser box.

Helpful Information

Information about application of sealants and adhesives.

Sours: https://bergdahl.com/class-of-sealants/

B sealant class

PPG PR1776M B-2 Low Weight Fuel Tank Sealant

Description

PR-1776M Class B is a low density, high temperature aircraft integral fuel tank sealant. It has a service temperature range from -65°F (54°C) to 250°F (121°C), with very limited excursions up to 360°F (182°C). This material is designed for fillet sealing of fuel tanks and other prolonged exposure to aircraft fuels both jet fuel and aviation gas, and will resist limited contact to diphosphate ester based hydraulic fluids.

PR-1776M Class B is a two-part, manganese dioxide cured Permapol® P-5 modified polysulfide. The uncured material is a low sag, thixotropic paste suitable for application by extrusion gun or spatula. It cures at room temperature to form a resilient sealant having excellent adhesion to common aircraft substrates.

PR-1776M Class B is designed to be a direct replacement for PR-1776 Class B.

Application life and cure time for PR-1776M B 2

Application life2
tack free time<16
Cure time to 30 A Durometer24

Specifications 

AMS 3281F Type 1 Class B2
BMS5-45
BMS5-45 Class B2

Please Note:

If you require further information please Click Here.

Sours: https://www.silmid.com/us/sealants/fuel-tank-sealants/PPG-PR1776M-B-2-Low-Weight-Fuel-Tank-Sealant-in-various-sizes/
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Overview

PR-1422 Class B is an aircraft integral fuel tank sealant. It has a service range from -65F (-54°C) to 250°F (121°C), with intermittent excursions up to 275°F (135°C). This material is designed for fillet sealing fuel tanks and other aircraft fuselage sealing applications. The cured sealant maintains excellent elastomeric properties after prolonged exposure to both jet fuel and aviation gas.

PR-1422 Class B is a two-part, dichromate cured poly-sulfide compound. The uncured material is a low sag, thixotropic paste suitable for application by extrusion gun or spatula. It cures at room temperature to form resilient sealant having excellent adhesion to common aircraft substrates.

Specifications

  • AMS-S-8802 - Type 1 Class B-2

Reviews

Product worked as advertised. Very easy to prepare. For best preparation instructions see the PPG Aerospace YouTube video.

Shawn GVerified Purchase

PR-1422B2 6 OZ 654 SEM KIT

June 16, 2021

Its a fair market price for the sealant and as far as versatile sealants it s impervious to fuel, even auto fuel, oil and water. Ive used a lot over the past 15 years.

Jim

September 10, 2020

Its a fair market price for the sealant and as far as versatile sealants it s impervious to fuel, even auto fuel, oil and water. Ive used a lot over the past 15 years.

Jim

September 10, 2020

Q&A

Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: I have never used this before, do I need something more than the container it comes in to apply it to the tank surface, and if so, what? p/n 09-04703

The kit comes with a push rod for the plunger end to help push out the material. You may want to purchase a nozzle, p/n 02-00099, to help apply in tight corners, or apply narrow beads of material.

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