OHMOID PHENOLICS:

Pheriolic laminate sheets are Composed of base materials combined with various resins, permanently cured with high temperature and pressure Varying the base materials and resins allows production of laminates with selective electrical, mechanical and thermal characteristics  

This guide is published by Wilmington Fibre to help you select the grade that offers the best performance and economy for your requirement.

NEMA GRADE	CHARACTERISTICS
X	General purpose grade Primarily mechanical.
XP	Punching grade having better electrical and moisture properties than grade X.
XX	Machining grade for normal electrical applications where humftlity conditions are not severe
XXP	Punching grade with characteristics similar to XX.
XXX	Excellent electrical and machining grade. For low cold flow and dimensional stability.
C	Mechanical fabric base grade characterized by high impact strength.
CE	Electrical fabric grade. Good machining and punching characteristics. Excellent dimensional stability and higher moisture resistance than C.
L	Mechanical fabric base grade suitable for fine machining applications.
LE	Similar to grade L but higher resin content for electrical applications. Better moisture resistance and dimensional stability than L.

Tolerances and Weights
Sheet — standard permissible variations in thickness (inches)*
Nominal Thickness, Inches	Grades X, XP, XX, XXP, XXX, XXXP	C Grade Plus or Minus	CE GradePlus or Minus	L GradePlus or Minus	LE GradePlus or Minus	Std. Wt.39" x 47"
.010 .015 .020 .025 1/32 1/64 1/16 3/32 1/8 5/32 3/16 7/32 1/4 5/16 7/16 1/2 5/8 3/4 7/8 1	.002 .0025 .003 .0035 .0035 .0045 .005 .007 .008 .009 .010 .011 Plus or Minus .012 .0145 .019 .021 .024 .027 .030 .033	-- -- -- -- .0065 .0075 .0075 .009 .010 .011 .0125 .014 Plus Only .030 .035 .044 .048 .053 .058 .062 .065	-- -- -- -- .0065 .0075 .0075 .009 .010 .001 .0125 .014 Plus or Minus .015 .0175 .022 .024 .027 .029 .031 .033	.003 .0035 .004 .0045 .005 .0055 .006 .007 .008 .009 .010 .011 Plus Only .024 .029 .038 .042 .048 .054 .060 .065	-- .0035 .004 .0045 .005 .0055 .006 .007 .008 .009 .010 .011 Plus or Minus .012 .0145 .019 .021 .024 .027 .030 .033	.9 1.4 1.8 2.3 2.8 4.2 5.7 8.5 11.4 14.2 17.1 20.0 22.9 28.6 40.0 45.8 57.2 68.7 80.1 91.6

	Average Test Values
		PAPER BASE PHENOLIC					FABRIC BASE PHENOLIC
	NEMA GRADE DESIGNATION	X	XP	XX	XXP	XXX	C	CE	L	LE
	Density, GM/CC Tensile Strength, PSI, Lengthwise Tensile Strength, PSI, Crosswise Compressive Strength, PSI, Flatwise Flexural Strength, PSI, Lengthwise Flexural Strength, PSI, Crosswire Impact Strength, IZOD, Edgewise ft. lbs./in. notch, lengthwise crosswise Rockwell Hardness, M Scale Bond Strength, lbs	1.35 20,000 16,000 36,000 28,000 23,000 .9 .7 110 900	1.33 11,000 8,500 20,000 18,000 15,000 1.1 .9 81 --	1.34 16,000 13,000 34,000 18,000 14,000 .55 .50 105 1,100	1.31 11,000 8,500 25,000 18,000 14,000 .55 .50 100 --	1.30 15,000 12,000 32,000 18,000 14,000 .5 .45 110 1,200	1.35 11,200 9,500 37,000 22,000 18,000 2.3 2.2 103 2,000	1.32 12,000 9,000 39,000 22,000 17,000 1.6 1.4 105 2,200	1.34 14,000 10,000 35,000 23,000 18,000 1.3 1.2 105 1,700	1.32 13,500 9,500 37,000 18,000 15,000 1.3 1.2 105 1,800
	Dielectric strength - Perpendicular to laminations short time, volts/mil 1/16"	700 500 50 5	800 500 60 11	700 500 50 10	700 500 65 15	700 500 65 15	-- -- -- --	500 360 45 5	-- -- -- --	500 360 50 6
	1/18"
	Dielectric strength - Parallel to laminations kilovolts, step by step 1/8" cond. A
	Cond. D 49/50
	Heat Resistance, °F, Short Time	275 250 4.0 2.3 .9	275 250 3.6 2.2 --	300 250 1.3 .9 .5	275 250 1.3 .9 --	300 250 0.8 .5 .3	275 225 2.7 1.6 1.0	300 250 1.3 .9 .5	275 225 2.0 1.4 .8	300 250 1.3 .8 .5
	Continuous
	Water Absorption, % 24 hours 1/16"
	1/8"
	1/2"

MACHINED ROD

Available in a wide range of diameters and grades The filler materials paper, canvas, or linen combined with phenolic resin produce machined rod acceptable for a broad range of applications Machined from sheet stock, rod has generally the same physical and electrical properties as the grade of material from which it is cut All rod is supplied with a ground finish Tolerances of ± 005' are standard for diameters of 1/8" to uS/is"

Nylon • Ohmoid Phenolics • Fibre • Delrin