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Description

P/S 895 Class B is an aerodynamic smoothing sealant.

It has a service temperature range from -65°F (-54°C)

to 250°F (121°C), with intermittent excursions up to

275°F (135°C). This material is designed for sealing

aircraft structures and pressurized cabins or for

depression filling and smoothing applications. The

cured sealant maintains excellent elastomeric proper-

ties after prolonged exposure to both jet fuel and avi-

ation gas.

P/S 895 Class B is a two-part, manganese dioxide

cured, polysulfide sealant. The uncured material is a

low sag, thixotropic paste suitable for application by

extrusion gun or spatula. This sealant has excellent

adhesion to common aircraft substrates.

The following tests are in accordance with MIL-S-38228

Class B specification test methods.

Application Properties

(Typical)

Color

Part A Black

Part B Silver gray

Mixed Silver gray

Mixing ratio Part A:Part B

By weight 10:100

Base viscosity

Poise (Pa-s) (Brookfield #7 @ 2 rpm), 15,000 (1500)

Slump, inches (mm)

Initial 50 Minutes 90 Minutes

B-1/2 0.05 (1.27) 0.05 (1.27) 0.05 (1.27)

B-2 0.20 (5.08) 0.20 (5.08) 0.20 (5.08)

Application life and cure time @ 77°F (25°C), 50%

Cure time

Application Tack free to 30 A

life time Durometer

(hours) (hours) (hours)

B-1/2 1/2 <8 24

B-2 2 <24 48

Performance Properties

(Typical)

Cured 14 days @ 77°F (25°C), 50% RH

Cured specific gravity 1.56

Nonvolatile content, % 97

Ultimate cure hardness,

Durometer A 50

Peel strength, pli (N/25 mm), 100% cohesion,

JRF immersion, 7 days @ 140°F (60°C)

MIL-S-5059 (Stainless steel)* 25 (111)

MIL-T-9046 (Titanium comp. C)* 24 (107)

QQ-A-250/13 (Alclad) 25 (111)

JRF/NaCl-H

O immersion, 7 days @ 140°F (60°C)

MIL-S-5059 (Stainless steel)* 27 (120)

MIL-T-9046 (Titanium comp. C)* 28 (125)

QQ-A-250/13 (Alclad) 28 (125)

* Primed with PR-148 Adhesion Promoter

Tensile strength, psi (KPa)

Standard cure, 14 days

@ 77°F (25°C), 50% RH 300 (2069)

7 days @ 250°F (121°C) 400 (2758)

72 hours immersion in JRF @ 140°F

(60°C), + 7 days @ 250°F (121°C) 350 (2413)

Elongation, %

Standard cure, 14 days

@ 77°F (25°C), 50% RH 300

7 days @ 250°F (121°C) 200

72 hours immersion in JRF @ 140°F

(60°C), + 7 days @ 250°F (121°C) 250

Thermal rupture resistance - Retains pressure of10 psi

with only negligible deformation, both before and

after immersion in JRF.

Low temperature flexibility @ -65°F (-54°C) - No

cracking, checking or loss of adhesion.

Corrosion resistance - No corrosion, adhesion loss,

softening, or blistering after 20-day immersion in 2-

layer salt water/JRF @ 140°F (60°).

Resistance to hydrocarbons - 7 days @ 140°F (60°C)

immersed in JRF.

Weight loss, % 5.5

Repairability to itself - Excellent to both freshly cured

as well as fuel aged and abraded fillets.

Resistance to other fluids - Excellent resistance to

water, alcohols, petroleum-base and synthetic lubri-

cating oils, and petroleum-base hydraulic fluids.

Fungus resistance Non-nutrient

TECHNICAL DATA

P/S 895 Class B Aerodynamic Smooting Sealant

Note: The application and performance property val-

ues above are typical for the material, but not intend-

ed for use in specifications or for acceptance inspec-

tion criteria because of variations in testing methods,

conditions and configurations.

Surface Preparation

Immediately before applying sealant to primed sub-

strates, the surfaces should be cleaned with solvents.

Contaminants such as dirt, grease, and/or processing

lubricants must be removed prior to sealant applica-

tion.

A progressive cleaning procedure should be employed

using appropriate solvents and a new lint-free cloth

conforming to AMS 3819. (Reclaimed solvents or tis-

sue paper should not be used.) Always pour solvent

on the cloth to avoid contaminating the solvent sup-

ply. Wash one small area at a time.

It is important that the surface is dried with a second

clean cloth prior to the solvent evaporating to prevent

the redeposition of contaminants on the substrate.

Substrate composition can vary greatly. This can affect

sealant adhesion. It is recommended that adhesion

characteristics to a specific substrate be determined

prior to application on production parts or assemblies.

For a more thorough discussion of proper surface

preparation, please consult the SAE Aerospace

Information Report AIR 4069. This document is avail-

able through SAE, 400 Commonwealth Avenue,

Warrendale, PA 15096-0001.

Packing Options

P/S 895 Class B is supplied in two-part kits and

Semco

cartridges.

Mixing Instructions

Mix according to the ratios indicated in the applica-

tion properties section. Mix Part A and Part B sepa-

rately to uniformity, then thoroughly mix entire con-

tents of both parts of kit together taking care to

avoid leaving unmixed areas around the sides or bot-

tom of the mixing container.

Semco is a trademark of PRC-DeSoto International, Inc., registered with the U.S. Patent Office.

All recommendations, statements, and technical data contained herein are based on tests we believe to be reliable

and correct, but accuracy and completeness of said tests are not guaranteed and are not to be construed as a war-

ranty, either expressed or implied. User shall rely on his own information and tests to determine suitability of the

product for the intended use and assumes all risks and liability resulting from his use of the product. Seller’s and manu-

facturer’s sole responsibility shall be to replace that portion of the product of this manufacturer which proves to be

defective. Neither seller nor manufacturer shall be liable to the buyer or any third person for any injury, loss, or dam-

age directly or indirectly resulting from use of, or inability to use, the product. Recommendations or statements other

than those contained in a written agreement signed by an officer of the manufacturer shall not be binding upon the

manufacturer or seller.

Printed in U.S.A.

Storage Life

The storage life of P/S 895 Class B is at least 9

months when stored at temperatures below 80°F

(27°C) in original, unopened containers.

Health Precautions

This product is safe to use and apply when recom-

mended precautions are followed. Before using this

product, read and understand the Material Safety

Data Sheet (MSDS), which provides information on

health, physical and environmental hazards, handling

precautions and first aid recommendations. An MSDS

is available on request. Avoid overexposure. Obtain

medical care in case of extreme overexposure.

For industrial use only. Keep away from children.

For emergency medical information call

1-800-228-5635.

Additional information can be found at:

www.ppgaerospace.com

For sales and ordering information call

1-800-AEROMI

X (237-6649).

P/S 895 Class B Aerodynamic Smooting Sealant

PRC-DeSoto International, Inc.

12780 San Fernando Road

Sylmar, CA 91342

Telephone (818) 362-6711

Toll Free (800) AEROMIX

www.ppgaerospace.com

Issue Date: 09/09

Supersedes: 06/09

Lit: 0137