POLYCAST   254

Low Viscosity Filled Epoxy Compound

DESCRIPTION:

Polycast 254 is a low viscosity, filled epoxy formulation which is used for encapsulation and embedment of electronic components.  It has excellent electrical properties and exceptional adhesion to most substrates. PC 254 is 100% solids.

 

PROPERTIES - UNCURED: Part A Part B (PC 67)  
Color, Visual Blue Brown  
Viscosity, cps. 6,000  900 ASTMD2393
 Specific Gravity  1.50  1.0  
Mix Ratio (By Weight)   100:18     
Mixed Viscosity, cps.   4,500  ASTMD2393
Pot Life @ 72o F, min.   35  
Shelf Life @ 72o F, months    12  
PROPERTIES - CURED:      
PHYSICAL      
Hardness Durometer (Shore D)    81 ASTMD 2240
Tensile Strength, psi    8000 ASTMD 638
Compressive Strength, psi   13,500 ASTMD 695
Flexural Strength, psi   13,500  ASTMD 790
Coefficient of Thermal Expansion (cm/cm/°C)   9 x 10-6  
Service Temperature    260°F  
Dielectric Strength, volts/mil   480  ASTMD 149
Volume Resistivity, ohm-cm   5 x 1016 ASTMD 257
Thermal Conductivity, (BTU/in / ft2°F)..... 5    

 

MIXING INSTRUCTIONS:

1.       Premix P.C. 254 in the original container prior to use to insure any settled filler may be reincorporated. Warming PC 254 to 100°F facilitates ease of use.

2.       Weigh out the required amount of P.C.254 Part A and the requisite Part B.

3.       Mix thoroughly, scraping both sides and bottom of container.

4.       Evacuate mixture at 29 in. Hg for 5-10 minutes (if desired).

5.       Pour into mold or cavity.

CURE SCHEDULE:                                                 

Overnight at Room temp. (75°F)

CAUTION: Good housekeeping rules are always important.  Provide ample ventilation in all areas of handling, mixing and use.  Avoid prolonged breathing of possible fumes.  Minimize skin contact.  Use of goggles, rubber gloves and protective creams is recommended.  Always wash exposed areas immediately using warm water and soap, followed by rinsing with clear water.  If material comes in contact with eyes, flush with clean water for 15 minutes and consult a physician immediately.

All data given in this bulletin is based on our own research and research of others.  They are believed to be accurate, however, no guarantee of accuracy is made.  Product described is sold without warranty, except conformity to specifications, and on condition that purchasers shall determine suitability for their particular purpose.

 

General Purpose
PC-100: Low Cost General Purpose
PC-125: Low viscosity potting and casting.
PC-133: Flame retardant casting
PC-135: Machinable.
PC-159: Flame retardant UL94V-0 rated.
PC-205: Low viscosity version of 159.
PC-266: Version of 159 meeting MIL-1-6923.

PC-290:Room Temp. Cure
PC-510: Low Viscosity, Clear Casting

Thermally Conductive
PC-100: Low Cost General Purpose
PC-140
: Castable Heat Sink, UL94v0.
PC-240: Superior resistance.
PC-280: Best balance of properties.
PC-282: Twice the conductivity of PC-280 with lower viscosity.
PC-287: Highest thermal conductivity.

PC-571: One Component, Rigid
PC-581: One Component, Flexible
PC-582: Flexible Heat Cure
PC-8300: Single Component, Casting Sand

Special Epoxies
PC-ALUM: Aluminum filled
PG-30: Room Temp Epoxygel
PG-50: Flexible Epoxy gel
PC-220: Electrically conductive
PC-250: Soft, flexible epoxy
PC-254: Low Viscosity Filled
PC-270: Aluminum Filled

PC-517: Adhesive Flexible
PC-601: Very low viscosity
PC-610: Optically clear
PC-661: Lightweight

PC-685: Superior thermal shock resistance

PB-839: Equal Ratio Adhesive
PC-8500: Single Component, Lightweight