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Home > Products > Impact/Flexibility > Universal Impact Tester
Universal Impact Tester

Model # 172RF

Universal Impact Tester Model #172
Model No. IM-172-RF

Basic Testers
The basic tester is made up of two major assemblies, the base and the guide tube. The black anodized solid aluminum base is 1.5" thick, 10" wide, 12" deep and has a sturdy arm for holding the guide tube. It is also fitted with: Leveling Screws, Die cavity, Circular level, Tube Clamp & Two test panel magnets.

The anodized aluminum gravity guide tube is 48" high, 1.25" I.D. and fitted with: Height scale-Inches/Centimeters & Height clamp

Impact Testers
The experience of many years has taught that the bending and stretching of the metal base on which a coating was applied provided valuable information on the elastic and adhesive characteristics of the coating. Numerous types of instruments have been used: powered elongation testers, cylindrical or conical mandrels, manual or powered indenters and falling weight indenters.

The falling weight indenters are normally most severe due to the "shock" nature of the test. Many different falling weight indenters are now in use and it is the design purpose of the new UNIVERSAL IMPACT TESTER, MODEL 172RF, to provide a range of operating capability that matches or exceeds most of these existing instruments. In addition, MODEL 172RF, with selected auxiliaries, exceeds specification ASTM D 2794.


Specification References
  • ASTM D 2794 "Resistance of Organic Coatings to the Effects of Rapid Deformation - Impact". MIL-P-85582C; MIL-P-23377G; MIL-C-85285A; MIL-E-24763A (SH); NCAA 11-10 (11-6, 11-16, AND X-1); ECCA
  • ASTM D 4226 "Impact Resistance of PVC Building Products"
  • Meets ASTM G 14 with optional accessories - Call for details
  • General Electric Company PLI-100 "Modified Gardner Impact Strength". 1975
  • Federal Highway Administration FP-74 "Standard Specifications for the Construction of Roads and Bridges on Federal Projects" Section 633.06 Traffic Control Signs- Impact Resistance.
  • Model 172RF meets Proposed Revision of TT-P-2756A, Polyurethane Coating: Self-Priming Topcoat, Low Volatile Organic Compounds (VOC).
  • ASTM D 6905 "Standard Test Method For Impact Flexibility Of Organic Coatings"
  • ASTM D 5420 "Standard Test Method for Impact Resistance of Flat, Rigid Plastic Specimens by means of a Falling Dart"
Universal Impact Tester

Assembly Instructions
  1. Secure the three leveling screws on the bottom of the base.
  2. Temporarily secure gravity tube to the base using the supplied allen wrench.
  3. Place die in die cavity of base.
  4. Tilt impact tester on side and at top of tube insert combined weight& ball or indenter punch & separate weight.
  5. While instrument is tilted on its side, place ball handle in indicator guide and secure assembly to combined weight & ball or separate weight. Be sure to place white indicator facing height scale.
  6. Hold indicator guide handle and slowly stand impact tester upright (if using indenter punch & separate weight combination let indenter punch slowly slide down the gravity tube as you stand
    the impact tester upright) then lower handle with weight down to the base.
  7. Slide height clamp over top of gravity tube and secure with knob handle.
  8. Level the impact tester by adjusting the three bottom leveling screws on the base until level bubble is centered.
  9. Lift handle and place panel on top of die and secure panel by use of magnets. If sample is non-magnetic it may be possible to use supplied magnet keepers to secure sample.
  10. Lift handle and place the square calibration block on top of test panel beneath the indenter. Lower handle so the indenter is resting on the 1" gauge block.
  11. Loosen gravity tube with allen wrench and adjust gravity tube up or down and align the indicator guide up with the one inch mark on the height scale of the gravity tube. Tighten gravity tube.
  12. Hold handle firmly and carefully remove the gage block. Slowly bring the handle down allowing the ball to rest on the panel surface, adjust panel as necessary.
  13. If you are testing multiple panels at a fixed height drop, release height clamp and adjust to designated height and secure.
  14. Assembly of the Gardco IM-172RF is complete.
  15. Always wear safety goggles during the impact tester operation.

Method of Use

Impact Tester Close Up

Coatings to be tested are applied to cleaned thin metal panels (suitable panels are available from the Paul N. Gardner Company.) After the coating to be tested is properly cured and ready for test, the test panel is placed on the selected supporting die and magnets, or for the GE evaluation, on the flexible anvil.

The selected indenter with associated weight or the combined indenter weight is placed in the tube so that it rests on the test panel. The guide tube is then adjusted in the base so that the scale registers zero at the lifting handle or mark and/or the position of such lifting member while at rest. The weight or combined weight indenter is then raised to the desired height, noted and released.

The test panel is inspected, and depending on results, the test may be repeated by releasing the weight or the combined weight indenter at a higher or lower elevation. (When using the GE Flexibility Test Impacter the usual practice is to use a fixed height drop, as is covered under "Procedure" below). Coating failure is determined when cracks first appear in the coating with the minimum inch-pounds of falling weight. Such failure cracks may be made more visible by the application to the test area of a copper sulfate solution (CuSO4).


Kit

(A) IM-172-1 - 2 lb., 1/2" Dropping Wt. (H) IM-172-9 - Die Original 5/8" 0.685" (O) IM-172-GE/2 - Fixture Plate
(B) IM-172-3 - 2 lb., 5/8" Dropping Wt. (I) IM-172-2 - ASTM 0.640" Die (P) IM-172-GE/3 - Rubber Anvil Pad
(C) IM-172-71 - 2 lb., Extnsn Wt. male/female (J) IM-172-45 - 14.5MM Proportional Die (Q) IM-172RF-912 - 3" Elevation Block
(D) IM-172-60 - ASTM 2 lb. Dropping Wt. (K) IM-172-4 - Accompanying Die (R) IM-172RF-911 - 1-1/2" Elevtn Block
(E) IM-172-31 - ASTM 5/8" Ball Indntr Punch (L) IM-172-0 - Blind Plg 40mm Rad.x1" Deep (S) IM-172-9303 - V-Block Pipe Center
(F) IM-172-11 - ASTM 1/2" Ball Indntr Punch (M) IM-172-GE/1 - Flexibility Impacter
(G) IM-172-12 - ASTM 0.125" Rad. 20° Indntr Pch (N) Carrying Case for Weights & Dies

Diagram
Weight Tolerances above ± 5%

ASTM Method D 2794, which is now also used in place of Federal Test Method Standard No. 141C, 6226 calls for a 0.64" diameter die which may be used with either a separate 0.500" or a 0.625" hemispherical head indenter. The ASTM method specifies that a separate weight (IM-172-60) be used to impact against the indenter punch. Normally, a two pound weight will satisfy most test conditions.

Range of the test equipment may be greatly extended by the use of an auxiliary drop weight. The two pound auxiliary weight may be secured to and used with the two pound separate drop weight.Many operators have found it more convenient to replace the separate weight and indenter punch with a combined single unit. The two pound combined units are available with hemispherical tip diameters of .500" and 0.625". The one kilogram combined unit has a tip diameter of 20 mm.

The combined weight indenter punch units have been found to provide a somewhat more severe test condition than the separate weight and indenter punch. This is due to the separate stationary indenter absorbing a small amount of the drop weight energy.

 
GE Flexibility Tester

Some of the Specifications That Call For the Use of the GE Impact-Flexibility Test are MIL-P-85582A, MIL-P-23377C, MIL C 85285A and ASTM D 6905-03 

The Universal lmpact Tester, Model 172RF, also accommodates the GE Impact Flexibilily test method. The GE impacter weights 3.6 pounds and has formed on each end four convex spherical segments which are of different radii and extensions.


Technical Data
Spherical Segment End Base Diameter Segment Radius Segment Evaluation % Area Increase
1 A 0.375 0.194 0.146 60
2 A 0.375 0.208 0.119 40
3 A 0.375 0.252 0.084 20
4 A 0.375 0.326 0.059 10
5 B 0.375 0.440 0.042 5
6 B 0.375 0.676 0.027 2
7 B 0.375 0.947 0.019 1
8 B 0.375 1.332 0.013 .5

Procedure
Operating procedure is essentially the same for all die, indenter punch and weight or combined ball weight-indenter punch combinations except for the GE impacter.

Insure that the apparatus is level and that the desired die, indenter punch and weight or combined weight-indenter punch are in place. It may be convenient to set the guide tube clamp at a specified height if a particular test series is to receive the same impact energy. Normal procedure is to place the test panel between the indenter punch and the die with the coating facing downward against the die. (Some investigators have gained important information on coating properties by placing the panel in the apparatus with the coating facing upward and in contact with the indenter punch). With the test panel in place, raise the weight or combined weight indenter punch to a predetermined level and release. Remove the test panel and inspect the condition of the coating. The test may then be repeated at the same drop level to confirm the initial reading or repeated at a different drop level.

Impact Teste with Allen Wrench
Allen wrench (as shown) can be used to support the
combination weight/indenter to make removing test panel
simple and convenient.
Following each test, the coating condition should be recorded along with the inch-pounds or meter-kilograms of the drop. It is also recommended that coating thickness be measured and recorded as well as the curing schedule and other possible influencing factors. Inch-pounds of drop is determined by subtracting the height reading, if not zero, by adjustment of the guide tube in the base arm, of the lifting rod or other index mark when the drop member is at rest on the test specimen from the drop height at the same reference point and multiplying this value by the pound weight of the drop element.
 
G.E. Impact-Flexibility Procedure
Proceed as follows to use the GE Impacter: Remove the die from its cavity in the base unit and install between the magnets, the aluminum plate with the top rubber anvil held in place with two strong rubber bands insuring that the bands are in the grooves of the plate so that the plate seats firmly on the base. This rubber anvil has a 60 Shore hardness and should be replaced if worn or damaged. Install the GE impacter in the guide tube.

With an uncoated panel in place on the rubber anvil, determine the height of drop for each end of the impacter to show on the panel slight evenly spaced segment marks of the impacter circumference. The heights so determined will always be used. Place the coated panel to be tested face down against the rubber anvil and drop the impacter from the above determined height. Remove the panel from the tester and inspect the coating. Record the maximum percent area increase accommodated by the coating without cracking or other failure, from the table on the preceding page.


New Modified IM-172RF-801
IM-172-801

This modified 172RF meets ASTM D 5420 (geometry GA, GB, GC, GD and GE) die configuration. The base on the new IM-172RF-801 has a special 3.25” diameter die cavity to accommodate the IM-172-832 (31.75mm) and IM-172-876 (76mm) die. The IM-172RF-801 can accommodate all the standard size dies when used with the IM-172-807 standard size die adaptor.

The new IM-172RF-801 consists of the modified base and gravity tube. The operation of this instrument is the same as the regular IM-172RF and all die and accessories are sold separately.


Available Items - Literature
Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices
All accessories are sold separately but the following are needed to make a complete system: Model 172 Impact Tester (base & gravity tube), Indenter (punch & falling weight or combined ball & weight), Receiving Die
IM-172RF Model 172 Basic Tester $1,263.00
IM-172-0 Blind Plug 40MM Radius X 1" Deep 225.00
IM-172-1 Comb. 1/2" Ball & 2 lbs WT Indenter 76.00
IM-172-11 ASTM 1/2" Ball Indenter Punch 95.00
IM-172-12 ASTM 0.125" Radius 20° Indenter Punch 440.00
IM-172-2 Accompanying Die, ASTM 0.640" 67.00
IM-172-3 Combined 5/8" Ball & 2 lb WT Indenter 76.00
IM-172-31 ASTM 5/8" Ball Indenter Punch 95.00
IM-172-4 Accompanying Die 67.00
IM-172-45 Proportional Die 14.5MM 69.00
IM-172-5 20MM Ball 78.00
IM-172-6 Accompanying Die 67.00
IM-172-60 ASTM 2 lb Dropping WT For Indenter Punch 72.00
IM-172-71 Extension Weight, 2 lbs., Male/Female 75.00
IM-172-8 Additional Screw-on WT,1 KG 75.00
IM-172-9 Die Original for 5/8" 0.685" 67.00
IM-172-R00 172 Base Replacement Only 722.00
IM-172-R01 Gravity Tube Replacement Only 279.00
IM-172-GE GE Impact Test Adapter Complete, ASTM D 6905 2,360.00
IM-172-GE/1 GE Indenter Only 1,950.00
IM-172-GE/2 GE Fixture Plate Only 375.00
IM-172-GE/3 GE Rubber Anvil Pad Replacement 42.00
IM-172RF-911 1-1/2" Elevation Block 138.00
IM-172RF-912 3" Elevation Block 138.00
IM-172-G14 ASTM G 14 Adapter, Complete 579.00
IM-172-G14/1 ASTM G 14 Combined 3 lb Weight, 5/8" Dia. Ball 102.00
IM-172-G14/2 ASTM G 14 V-Block Attachment w/Hardware 346.00
IM-172-G14/3 Clamps, High Torque Stainless (Pair) 12.50
Modified IM-172RF
IM-172RF-801 Modified Base with Special Die Cavity 1,513.00
Accessories for IM-172RF only
IM-172-807 Die Adapter for Standard Die 260.00
IM-172-832 31.75 mm Die (GB geometry) 260.00
IM-172-876 76 mm Die (GA & GD geometry) 260.00
Special dies, weights & indenters made upon request to your specifications.

¹Warning: Damage will result if receiving die or blank plate such as IM-172-GE/2 (RUBBER ANVIL PAD) is not in place while the instrument is in use.

Caution: The operation of this instrument involves high energy impact. Eyes should be protected with safety glasses. Fingers and hands should be kept clear of the impact area.


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