ocument is provided in good faith, but no warranty is given or is to be implied regarding its accuracy or relevance to any particular
application. Users must satisfy themselves regarding the suitability and safety of their use of the information and products in the application concerned.
Sumitomo Bakelite North America, Inc.
24 Mill Street, Manchester, CT 06042-2316, USA
Tel. 1-800-243-7158, Fax 1-860-646-5503

Sumitomo Bakelite North America, Inc.
Corporate Office and
Technical Market Development Center (TMDC)
46820 Magellan Drive, Suite C, Novi, MI 48377
Tel. 1-248-313-7000, Fax 1-248-8313-7027

www.sumitomobakelite.com



Technical
Data Sheet

RX
®
852
Description
RX
®
852 is a fiberglass reinforced phenolic novolac compound,
with good dimensional stability and good strength at elevated
temperatures.
Available colors
Black
Available molding grades
Compression, Transfer, Injection
Form
Flake
Properties
1

Typical Value
Unit
Method
Phy
s
ic
a
l

Specific Gravity
1.86
g/cm³
ISO 1183
Apparent (Powder) density
0.70
g/cm³
ISO 60
Molding shrinkage
0.10
%
ISO 2577
Post shrinkage
-
%
ISO 2577
Water absorption

0.03
%
ISO 62
Th
e
rma
l

Temperature of
deflection under load
As Molded
225
°C at 1,8 MPa
ISO 75A
Post Baked
> 282
°C at 1,8 MPa
ISO 75A
Thermal Conductivity
0.68
W/mK
ASTM C518
UL Temperature Index
-
°C
UL 746B
UL-flammability
3.2 mm
-
-
UL 94
1,6 mm
-
-
UL 94
Coefficient of linear
thermal expansion
parallel
23
10 E-6/°C
ASTM E831
perpendicular

42
10 E-6/°C
ASTM E831
M
e
c
h
a
ni
c
a
l

Flexural strength
130
MPa
ISO 178
Flexural modulus
19
GPa
ISO 178
Tensile strength
70
MPa
ISO 527
Izod impact strength, notched
4.0
J/m
ISO 180
Compressive strength
215
MPa
ISO 604
Rockwell Hardness, E Scale
90
-
ISO 2039/2
Ele
c
tric
a
l

Dielectric Constant, I MHz, wet
-
-
ISO 93
Dissipation Factor, 1 MHz, wet
-
-
ISO 93
Arc Resistance
180
Seconds
ASTM D495
Dielectric strength,
60 Hz, wet
ST
12.5
kV/mm
ASTM D149
SS
-
kV/mm
ASTM D149
Tracking resistance
-
V
IEC 112




1
Properties measured on compression molded ISO specimens
2
Values are typical, not statistical minimums. Contact your Sumitomo Bakelite representative for specifications.
ST = short time. SS = step-by-step. Wet = immersed in H
2
0 for 48 hrs. at 50 °C prior to testing.
Certification to ASTM D-5948 requires batch testing. All testing in accordance with ASTM D-5948. ASTM D-5948 supersedes MIL-M-14.

Contact your Sumitomo Bakelite representative for post baking recommendations.
Revision Date: 4/15/2008