OSTONFELT Company Inc.
31 Front Street- P.O. Box 6258 - East Rochester, NH 03868
Phone 603-332-7000 - Fax 1-800-332-4770 - International Fax 603-332-6049
BostonFelt Home Page - Contact Form - Email: felt@bostonfelt.com


SAE & Sheet Felt

Go to Technical Felts

INTRODUCTION AND SAE FELTS

Felt is truly a remarkable product. It owes its uniqueness to the ability of sheep wool to "felt". The wool fiber has a resilient cortex encased in a rigid jacket covered with microscopic barbs, or scales. With heat, moisture and pounding, the fibers relax, curl and interlock in all directions. With increased hammering and pounding, the fibers are compressed or hardened into an unbelievable tight dense mass. The resulting product is so firm and compact that it can be turned on a lathe, routed, ground, sanded, skived, and drilled. Few other materials can be machined to such close tolerances while still retaining a degree of resilience.

100% wool felt is divided into two broad classifications, SAE Felt and Technical Felt. SAE felt is available in rolls or sheets. Technical felt is available only in sheets. Density, which relates to hardness, determines major property differences. Felt density is determined by weighing a 36" x 36" x 1" sample. For example, if a 36" x 36" x 1" felt sheet weighs 20 lbs., it is referred to as "20-lb. felt."

Engineers and designers specify felt for numerous and various reasons and applications including: vibration absorption, noise reduction, bearing strength, sealing, wicking or fluid transmission, lubrication, roller bearings, filters, heat barriers, bumpers, components, liners, retainers, shock absorbers, weather seals, dust shields, anti-squeaking, insulation, padding, plugs, packing, polishing (glass, stone, jewelry, fiberglass metals, plastics, etc.), furniture rubbing and staining, burnishing, pen nibs, lamp bases, legging, sleeves, and countless more!


SPECIFICATIONS FOR SAE FELTS

Style/Mean Wt. Conversion Chart:

40" x 60" Sheet Thickness

Style1/4"1/2"5/8"3/4"1"
F-17.4 lb14.8 lb18.5 lb22.2 lb29.6 lb
F-27.4 lb14.8 lb18.5 lb22.2 lb29.6 lb
F-37.4 lb14.8 lb18.5 lb22.2 lb29.6 lb
F-55.7 lb11.3 lb14.2 lb17.0 lb22.7 lb
F-75.7lb11.3 lb14.2 lb17.0 lb22.7 lb

Properties That Apply To all SAE Felts
Thermal Expansion0
COEF of Friction0.37
Compressibility Recovery, %99.0
Effect of Sunlight & OxidationNone
Solvent Resistance and Stability In OilExcellent
Alkali Resistance (dilute)Fair
Acid Resistance (concentrated)Good except F-7
Temperature Range, F-80 +200

PropertiesF-1F-2F-3F-5F-7
Commercial Grade16R116R216R312R112R3
Wool Content %9590859580
Density 1" lbs/sq. yard1616.015.6012.2412.24
ColorWhitePinkGrayWhiteGray
Specific Gravity (%)3434342626
Therm. Cond. (70F), btu/hr/sq ft/F/in0.360.360.350.300.30
Air Perm (1/16"), cfm/sq ft/5" H2O10-3010-3015-3520-5020-50
Liquid Absorption, % wt. (1.0 sp gr)>175>175>190>250>225
Liquid Absorption, % by volume7474768880
Wicking Height (575 SSU, 70F), in.4.04.04.03.03.0
Vibration Absorption StaticHighHighHighMediumMedium
Vibration Dynamic StressHighHighHigh-mediumHighMedium
Noise Reduction Coef (1")0.500.500.520.580.58
Tensile Strength (min), psi500500400400250
Elongation (100 psi), %1314161621
Mullen B.S. (1/8"), psi250225200175125
Split Resistance (min), lb/2" width3328221812
Hardness, Shore A30-4030-4030.4020-3020-30
Compressibility (10% defl), psi21211366
Abrasion ResistanceExcellentExcellentExcellentGoodGood


TECHNICAL FELTS

High Density Sheets

Technical felts are generally available in four grades and densities ranging from 16 pounds to 32 pounds. (Higher densities to more than 50 pounds are available as non-stock standards. The four grades are: S1 - Extra Fine White Wool; S2 - Fine White Wool; S3 - Coarse White Wool; and, S4 - Coarse Gray Wool.

SPECIFICATIONS FOR TECHNICAL FELTS

Density Conversion Chart 36" x 36" Sheet Thickness
DEN1/41/23/41"1 1/41 1/22"
164 lb8 lb12 lb16 lb20 lb24 lb32 lb
205 lb10 lb15 lb20 lb25 lb30 lb40 lb
266.5 lb13 lb19.5 lb26 lb32.5 lb39 lb52 lb
328 lb16 lb24 lb32 lb40 lb48 lb64 lb
Properties That Apply To all Technical Felts
Wool Content, % min95
Thickness Range1/8" to 3"
Thermal Expansion0
Compressibility Recovery, %99.0
Effect of Sunlight & OxidationNone
Solvent Resistance and Stability In OilExcellent
Alkali ResistanceFair
Acid Resistance (concentrated)Good
Temperature Range, F-80 +200

Properties16S Soft20S Med26S Hard32S Hard or Extra Hard
Commercial Grade16S20S26S32S
Coef of Friction %0.370.420.420.42
Density 1" lbs/sq. yard16202632
Specific Gravity (%)34435668
Therm. Cond. (70F), btu/hr/sq ft/F/in0.360.450.630.91
Air Perm (1/16"), cfm/sq ft/5" H2O<2010<3<1
Liquid Absorption, % wt. (1.0 sp gr)>175>100>75>50
Liquid Absorption, % by volume74665848
Wicking Height 4.04.55.05.5
Vibration Absorption StaticHighHighVery HighUltra High
Vibration Dynamic StressHighHighHighHigh
Noise Reduction Coef (1")0.500.410.280.05
Tensile Strength (min), psi300-500300-600400-600400-600
Elongation (100 psi), %N/AN/AN/AN/A
Mullen B.S. (1/8"), psi250325N/AN/A
Split Resistance (min), lb/2" width20-3232-4430-4840-50
Hardness, Shore A30-4045-5555-6575-85
Compressibility (10% defl), psi325886121
Abrasion ResistanceExcellentExcellentExcellentExcellent

Specialty Hair Felt

A course blend of hair fibers combined to produce an inexpensive alternative for your sheet felt needs. Hair felt is available in a range of densities from 16 soft to 32 extra hard. Thickness of 1/2" to 3" are produced. Typical applications for this product include packing, vibration mounting, polishing. and wiping. Hair felt can offer good abrasion resistance, strength and durability.

Long and short runs! Fast quotes! Speedy delivery! Friendly Service! High Quality!

E-MAIL, FAX, OR SEND YOUR PRINTS & IDEAS.

General Information SAE & Sheet Felt Wicks/Fluid Transfer
Gaskets/Washers Drum Beaters Felt Polishing Bobs
Felt Polishing Wheels Felt Ring Buffs Jewelry Finishing
Carrier Heads Adhesive Back Felt Synthetics, Plushes, etc.
Lamp Bases, Etc. Custom Die Cutting 500 Uses for Felt


OSTONFELT Company Inc.
31 Front Street- P.O. Box 6258 - East Rochester, NH 03868
Phone 603-332-7000 - Fax 1-800-332-4770 - International Fax 603-332-6049
BostonFelt Home Page - Contact Form - Email: felt@bostonfelt.com