Rubber Specific Test Instructions

Please review the following information before testing.

It is not required that participants report results for all properties in multiple property tests.

Please return all data sheets to CTS for processing. If you are not reporting data for a test or property, RETURN THE BLANK DATA SHEET TO CTS.

If you are faxing the data sheets to CTS, you MUST use a cover sheet indicating the total number of pages you are sending. CTS will contact participants if the number of data sheets received is less than what is indicated on the cover page.

Analysis Analysis Name

605-608 Tensile Properties of Precured Rubber

620 Hardness

630-633 Tensile Properties of Lab Cured Rubber

660-661 Mooney Viscosity

669-674 Vulcanization Characteristics (ODR)

684-689 Vulcanization Characteristics (MDR)

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Hardness (Type A/ Shore A)

Analysis: 620

Test Method: ASTM D2240

Pack: RT

NOTE: If also enrolled in Tensile Properties of Precured Rubber, perform the Hardness test before proceeding to the Tensile test. The same samples are used for both.

Follow the instructions in ASTM D2240. Condition the samples for at least 3 hours at a temperature of 23 ± 2°C. Hardness is measured on a plied specimen formed by the five dumbbells cut from a single sheet for the tensile test. Take care to exclude air between plies when forming the specimen. Place a different dumbbell on top for each measurement, for a total of five measurements per sample. Measure hardness at enlarged end of dumbbell. Handle specimens with care since they are subsequently used for measuring tensile properties. If you use a different test method that is comparable to D2240, indicate this fact where asked on the data sheet.

HOW TO REPORT DATA: Report data up to the nearest 0.1 unit. [Whole numbers are acceptable.]

The "CONDITIONS' section may indicate the time at which hardness readings were taken in the previous test round (0-5 seconds, 5 secs, >5 secs, or maximum hardness indicator). Update this information if necessary.

Tensile Properties of Lab-Cured Rubber

Analysis: 630-633

Test Method: ASTM D412 (Tensile) & ASTM D3182 (Curing)

Pack: UT

Samples should be kept refrigerated until curing

Please check the weight of included samples before curing. If the weight exceeds 65g, trim the slab to approximately 65g. Please use caution. Trim a little at a time.

Cure at 320°F (160°C). Cure time should be specified on the Sample Pack. If you are unsure of the cure time, please contact CTS.

Refer to the Instructions below and to the instructions on Pack Sheet RT (PRECURED TENSILE SAMPLES) for conditioning, testing and reporting procedures.

TEST INSTRUCTIONS

*** Cure the samples as soon as possible after receipt. Store the cured samples in an appropriate atmosphere until ready to condition and test. ***

For the preparation of Standard Vulcanized Sheets, follow the instructions in ASTM D3182. The two plaques should be cured at 320°F and molded into 6 by 6 by 0.08 inch samples. (Note that the thickness is approximate and may vary. Always use actual thickness measurements when computing stress area.)

The cure time is printed above. After curing, condition the samples for at least 24 hours at a temperature of 23 ± 2°C before testing.

Continue to follow the instructions in ASTM D412, as well as the instructions for TENSILE PROPERTIES OF PRECURED SAMPLES found on PACK RT, for testing the enclosed tensile samples and for reporting data

Mooney Viscosity

Analysis: 660-661

Test Method: ASTM D1646

Pack: MV

You will need both packages 1 & 2 to complete the test.

The samples do not require mill massing. The materials used in this testing cycle are described on the data sheet. Follow the procedure in ASTM D1646 on conditioning and preparing the specimens. Use the large rotor and a die temperature of 100°C. Allow the specimen to warm in the die cavity for one minute before starting the rotor. Three specimens from each of the four samples should be tested.

Specimens should be prepared so as to avoid the edges of the sample whenever possible.

HOW TO REPORT DATA: Report the data to the first decimal place.

(This deviates from the test method, which calls for whole numbers.)

For NBR and SBR samples, report data as ML 1 + 4.

For butyl samples, report data as ML 1 + 4 and/or ML 1 + 8.

If following a test method other than D1646, be sure to indicate this fact on the data sheet.

IMPORTANT: The use of film during testing is NOT recommended. If film is used, indicate the type of film used in the "comments" section of the data sheet. Your data sheet may indicate if film was used by your lab in the previous testing round.

Update this information as necessary.

Film should never be placed against the rotor; film is only used between the die and the specimen.

Vulcanization Characteristics (ODR)

Analysis: 669-674

Test Method: ASTM D2084

Pack: OD

Refrigerate samples until ready to condition and test

Follow the instructions in ASTM D2084. For this program, please perform all tests using a steel disk. If using a titanium disk, report this deviation from the test method on your data sheet. From each sample, prepare three specimens having a mass of 9 to 10 grams (volume 8 to 9 cm3). The specimens should be at room temperature (23 ± 2°C) before inserting into the instrument.

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Test each specimen for a period of 30 minutes from closure of dies.

The following data should be recorded for each specimen:

(1) the time period between closure of dies and a torque increase corresponding to ML + 0.1(MH - ML), t'(10);

(2) the time period between closure of dies and increase of torque of 1 dN.m or 1 You are not allowed to view links. Register or Login above the minimum torque, tS1;

(3) the time period between closure of dies and a torque midway between minimum and maximum, t'(50);

(4) the time period between closure of dies and a torque increase corresponding to ML + 0.9(MH - ML), t'(90); (5) the minimum torque; and

(6) the maximum torque.

Test Conditions: vulcanization temperature of 160 ± .5ºC;

Frequency of disk oscillation of 1.7 Hz (100 cycles per min); Amplitude of one degree (±1° arc):

Recommended torque ranges are 0 – 50 You are not allowed to view links. Register or Login or 0 – 100 You are not allowed to view links. Register or Login

How to Report Data: Report all values to one or two places to the right of the decimal point.

Record time properties (tS1, t

_

50, t

_

90) in decimal minutes.

Verify that you have indicated a valid unit for torque data (lbf.in is the default unit) on your data sheets. The same unit must be used for all samples in a given property. Labs have the option of reporting both ts1 and t'10, neither property, or may choose one of the two.

Vulcanization Characteristics (MDR)

Analysis: 684-689

Test Method: ASTM 5289

Pack: MD

Test Method: Follow the instructions in ASTM D5289.

Test Conditions: Vulcanization temperature of 160°C Amplitude of oscillation: ±.5° of arc

Use only the film provided with the samples. Failure to use the enclosed film OR the use of a different film may generate non-comparable results.

Sample Preparation: Prepare three specimens of each sample such that a specimen has a volume 3 to 5 cm3. Refer to ASTM D5289 for additional guidelines on sample preparation. The specimens should be at room temperature (23 ± 2°C) before inserting into the instrument.

Test each specimen for a period of 15 minutes from closure of dies.

Properties: The following data should be recorded for each specimen:

(1) the time period between closure of dies and increase of torque of 1 dn.m or 1 You are not allowed to view links. Register or Login above the minimum torque, tS1;

(2) the time period between closure of dies and a torque midway between minimum and maximum, t'(50);

(3) the time period between closure of dies and a torque increase corresponding to ML + 0.9(MH - ML), t'(90); (4) the minimum torque; and

(5) the maximum torque.

How to Report Data: Report all values to one or two places to the right of the decimal point.

Record time properties (tS1, t'50, t'90) in decimal minutes or seconds. Verify that you have indicated a valid unit for torque data (lbf.in is the default unit) on your data sheets. The same unit must be used for all samples in a given property. Labs have the

option of reporting both ts1 and t'10, neither property, or may choose one of the two.