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Sulphuric Acid on the WebTM Technical Manual DKL Engineering, Inc.

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Materials of Construction - Acid Resistant Linings - Rhepanol ORG
March 26, 2002

Introduction
Physical Properties
Chemical Resistance
Vendor
Associated Links

 


Introduction

Rhepanol ORG sheeting is a grahite-filled polyisobutylene rubber sheet product used in the protection of surfaces from chemically aggressive media.  Rhepanol ORG sheeting has stood the test of time in the field of surface protection against the effect of various liquid or gaseous chemical media.  The sheeting is used mostly in conjunction with chemically-resistant bricks, tiles, clinker, etc.

Rhepanol ORG is generally available in three different thickness; 1.5, 2.0 and 3.0 mm.  The width of the roll is generally 1.05 m.

The sheeting is supplied as non-powdered black sheets that are smooth on both sides.

Physical Properties

Density 1.37 g/cm³
Ultimate Tensile Strength (DIN 53 455) 30 kgf/cm²
Elongation at Break (DIN 53 455) 400%
Shore Hardness (DIN53 505) 80 ±3
Tear Propagation Strength (DIN 53 515) 25 kgf/cm
Thermal Conductivity (DIN 52 612) 0.2 kcal/m h °C
Specific Resistance (DIN 53 482) 60 ohm cm
Surface compression strength without stresses
on points or edges
100 kgf/cm²

Rhepanol ORG sheeting conducts electricity and therefore cannot be electrically tested for freedom from pores or integrity of the lining.

Chemical Resistance

The chemical resistance of Rhepanol ORG to sulphuric acid is a as follows:

Concentration
%H2SO4

Temperature

20°C 60°C
10 1 1
50 1 1
70 1 -
80 2 4
98 3 4

1 - Stable: Many years of practical experience is available as a rule

2 - Practically Stable: When stressed under the indicated conditions, only minor changes in mechanical properties have to be expected even over prolonged periods of time.

3 - Conditionally Stable: Significant reduction in the mechanical properties must be expected when stressed over a prolonged period of time although the functional efficiency may well be preserved.

4 - Stable Over Short Periods: The sheets must not be exposed to the medium concerned except for shot periods of time if major damage is to be avoided.

It is interesting to note that the material is not 100% stable when exposed to 98% H2SO4 at 60°C, the exact conditions that exist in most  absorption/drying systems.  The acid resistant brick lining reduces the temperature at the lining and shell to 60°C under normal operating conditions.  During upset conditions, abnormal operation or high ambient temperatures the temperature at the lining can exceed 60°C.  As well, acid will eventually permeate through the brick lining and contact the lining material.   When these conditions occur for prolong periods of time, the lining will be damaged and acid will eventually leak to the carbon steel shell.  The end result will be corrosion of the shell, acid leaks and reduced life of the equipment.

Vendor

Flachdach Technologie GmbH & Co. KG
Eisenbahnstrabe 6-8
68199 Mannheim
Germany

Telephone : 0621 8504 0
Fax : 0621 8504 205
e-mail : info@flachdachtec.de
Web Site : www.flachdachtec.de