How To Use This Book

Data Table Section

In this section, detailed chemical resistance information on rigid thermoplastic materials is provided. Each of the fifty three

chapters in this section contains data tables, each table representing a single generic material. Within each table, records are

arranged alphabetically by exposure medium. When complete chemical resistance data for a single material is desired, the

Data Table section is the best reference. Each row in this section represents one specific chemical tested on the material under

the specified test conditions.

The information provided varies from table to table since different information is relevant and/or available for each

material. The following grid outlines all of the different fields which can be found in the data tables.

Material Index

All materials are listed alphabetically in this index. The user can easily find a specific material and the location of the table

within the book.

Alphabetical List of Exposure Media

In the Alphabetical List of Exposure Media, all exposure media which appear in the Data Table section are listed alphabeti-

cally together with a list of the thermoplastics on which they have been tested. Using the PDL Resistance Rating provided,

the user can quickly determine which thermoplastics may or may not be suitable for use with a given exposure medium.

With the material names and the material index the user can refer to the Data Table section for more detailed information.

If in the Data Tables more than one PDL Rating is listed for a given exposure medium/material combination, the range of

PDL Ratings is provided in the List of Exposure Media.

Synonyms of exposure media are included in List of Exposure Media, with a cross-reference to the exposure medium

name used in this book.

FIELD HEADING DESCRIPTION

Exposure medium reagent or other medium to which the thermoplastic was exposed

Exp. medium note additional Information about the exposure medium and conditions of exposure

Conc. (%) concentration of the given exposure medium, often expressed as a percentage

Temp. (°C) exposure temperature in degrees °C

Time (days) exposure time in days

PDL # PDL Rating; based on a scale of 0 to 9 (with 9 as the highest resistance); details of how the rating is calculated aregiven later in this section

% Change

Length % change from length before exposure

Vol. % change from volume before exposure

Weight % change from weight before exposure

% Retained

Elong. % of original elongation retained

Tensile strength % of original tensile strength retained

Impact strength % of original impact strength retained

Resistance note additional Information about the resistance of the thermoplastic to the exposure medium (i.e. observed changes, safetynotes, etc.)

Test note additional information about the test

Material note details of the specific material tested, this includes, if available, supplier, trade name, grade, filler, specimen details(although supplier names in particular may have changed since the data was compiled).

PDL Resistance Rating

The PDL Resistance Rating is determined using a weighted value scale developed by PDL and reviewed by experts. Each of

the ratings is calculated from the test results for a material after exposure to a specific exposure medium in the conditions

specified.

The PDL Rating gives a general indication of a material’s resistance to a specific exposure medium and helps the user to

readily identify the materials most likely to be resistant to a specific exposure medium.

After assigning the weighted value to each field for which information is available, the PDL Resistance Rating is determined

by adding together all weighted values and dividing this number by the number of values added together. All numbers to the

right of the decimal are truncated to give the final result. If the result is equal to 10, a resistance rating of 9 is assigned. Each

reported field is given equal importance in assigning the resistance rating since, depending on the end use, different factors

play a role in the suitability for use of a material in a specific environment.

Supplier resistance ratings are also taken into account in the calculation of the PDL Resistance Rating. Weighted values

assigned depend on the scale used by the supplier.

The following tables give the values and guidelines used in assigning the PDL Resistance Rating. The guidelines are some-

times subject to an educated judgment. Every effort is made to maintain consistency and accuracy.

CAS Registry Numbers

Chemical Abstracts Service (CAS), a division of American Chemical Society, began the CAS Chemical Registry in 1965.

The CAS Chemical Registry is a computer-based system that automatically identifies structural diagrams and assigns to each

a unique CAS Registry Number. This number, which has no chemical significance, is then used within a larger processing

system to link the molecular structure with its CA index name and other data. Registry numbers, even in the absence of

names, therefore provide an efficient means of substance identification in technical publications and scientific communica-

tions. Many publications and information sources have adopted CAS Registry Numbers to identify chemical substances.

In the CAS Registry Numbers appendices (chemical sort and numeric sort) CAS Registry Numbers are listed for many of the

materials, as well as the exposure media, covered in Chemical Resistance of Thermoplastics.

WeightedValue

WeightChange*

Diameter;Length* Change

VolumeChange*

Mechanical**

Property RetainedVisual/Observed*** Change

10 0]0.25 0]0.1 0]2.5 .597 no change

9 .0.25]0.5 .0.1]0.2 .2.5]5.0 94],97

8 .0.5]0.75 .0.2]0.3 .5.0]10.0 90],94

7 .0.75]1.0 .0.3]0.4 .10.0]20.0 85],90 slightly discolored slightly bleached

6 .1.0]1.5 .0.4]0.5 .20.0]30.0 80],85 discolored yellows slightly flexible

5 .1.5]2.0 .0.5]0.75 .30.0]40.0 75],80 possible stress crack agent flexible possible oxidizingagent slightly crazed

4 .2.0]3.0 .0.75]1.0 .40.0]50.0 70],75 dostorted, warped softemed slight swelling blisteredknown stress crack agent

3 .3.0]4.0 .1.0]1.5 .50.0]70.0 60],70 cracking, crazing brittle plasticizer oxidizer softenedswelling surface hardened

2 .4.0]6.0 .1.5]2.0 .60.9]90.0 50],60 severe distortion oxidizer and plasticizer deteriorated

1 .6.0 .2.0 .90.0 .0],50 decomposed

0 solvent dissolved disintegrated

*All values are given as percentage change from original.**Percentage mechanical properties retained include tensile strength, elongation, modulus, flexural strength and impact strength. If the % retention isgreater than 100%, a value of 200 minus the % property retained is used in the calculations.***Due to the variety of information of this type reported, this information can be used only as a guideline.

xvi How to Use this Book