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TYPE
 PTC MODEL No. MAIN SPRING TRAVEL INDENTER DESCRIPTION INDENTER
IMAGE		 APPLICATIONS
A
ASTM D2240
JIS K6253
ISO 868 		201
211
306L
408
501A
511A
821 gf
1.81 LB
0.100 inch
travel		 Truncated Cone
35° Included Angle		 A Indenter Soft rubber, elastomers, neoprene,
silicone, vinyl, nitrile, and butyl,
soft plastics, felt, leather,
waxes, printing rollers
and similar materials
B
ASTM D2240		 821 gf
1.81 LB
0.100 inch travel		 Conical
30° Included Angle		 B Indenter Rubber, elastomers,
use when off the high
end of the A scale

C
ASTM D2240

 202C
212C
307CL
409C
502C
512C		 4.53 kgf
10 LB
0.100
inch travel		 Truncated Cone
35° Included Angle		 C Indenter Medium hard
rubber or plastics
use when off the
low end of the D scale
D
ASTM D2240
JIS K6253
ISO 868		 202
212
307L
409
502D
512D		 4.53 kgf
10 LB
0.100 inch travel		 Conical
30° Included Angle		 D Indenter Hard rubber, plastics, acrylic,
delrin, kevlar, pvc, nylon,
lexan, epoxies and similar materials
DO
ASTM D2240		 202DO
212DO
413
502DO
512DO		 4.53 kgf
10 LB
0.100 inch travel		 3/32" Spherical
Diameter
(2.38mm)		 DO Indenter Dense textile
winding, medium
printing rollers
E
ASTM D2240		 408E
501E
511E
821gf,
1.81 lbs
0.100 inch travel
 0.200" Spherical
Diameter
(5.08mm)		 E Indneter Medium density
textile windings,
soft rubber,
foamed
elastomers,wound
threads,yarn
O
ASTM D2240		 2010
2110
410
501/O
511/O		 821gf,
1.81 lbs
0.100 inch travel		 3/32" Spherical
Diameter
(2.38mm)		 Type O Indenter Soft printing rollers,
textile windings
OO
ASTM D2240		 113gf,
4.0 oz.
0.100 inch travel		 3/32" Spherical
Diameter
(2.38mm)		 Type OO Indenter Sponge rubber,
very soft rubber
OOO
ASTM D2240		 412
412L		 113gf,
4.0 oz.
0.100 inch travel		 1/2" Spherical
Diameter
(12.7mm) 		Type OOO Indenter Very soft materials, (e.g.) open cell foam

SL
FOAM RUBBER

PTC STANDARD

 142gf,
5.0 oz.
0.200 inch travel

1 cm2- Circular

(0.155in2)

 Type SL Indenter Foam and sponge rubber,
cellular and gel-like material
CF
ASTM F1957-99		 414CF 9.11kgf
20lbs
0.200 inch travel		 .1/2" Spherical
Diameter
(12.7mm) 		Type CF Indenter Composite Foam
Asker C
SRIS-0101
JIS K7312		 601
603
604
611
855gf,
1.89 lbs
0.100 inch travel
0.200" Spherical
Diameter
(5.08mm)
 Asker C Indenter
Medium density
textile windings, soft rubber,
foamed elastomers,
wound threads, yarn
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