Ask The Expert

Harry answers your questions....

Harold E “Harry” Yohn serves as Product Applications Specialist for Tinius Olsen Testing Machine Co. in Horsham, Pa. Harry has been with the company since 1996. He has 19 years of experience in the field of mechanical and physical testing of plastics. In 1990, Harry became a member of ASTM International Committee D20 on Plastics, and he is now a vice chair of the committee (methods), a group of about 700 members responsible for 473 standards. He is also Subcommittee chairman for D20.30 on Thermal Properties of Plastics and chair of D20.10 Impact Properties as well as chair of several task groups within the committee. Harry has been honored with an Award of Appreciation in 1998 and an Award of Recognition in 2004. In addition to his D20 work, Harry participates in standards development through the International Organization for Standardization (ISO). He is currently part of the U.S. delegation to ISO/TC61Harry is a 1983 graduate of the Pennsylvania State University. Before joining Tinius Olsen, he served as sales engineer and then sales manager for Custom Scientific Instruments, Inc. a division of Atlas Electric Devices Co of Chicago.

Items	Rating	Hits
barrel diameter mp960		254
Correlation between HLMI and MI		413
Dear Harry is there any standard for measuring the spiral flow of polyethylene		996
electricity leakage of MP600		559
H10KT- Have I been sold right machine?		520
Harry how can i detect the percentage of PVC content in PET grinded? we are a recycling company look for improve our quality control lab?		1052
Harry, how much time do I have to fill the Melt Indexer Barrel and start the test in a Method A Test. I have heard 60 Seconds to fill and then wait 300 Seconds or 420 Seconds. What is the proper procedure?		1013
Harry, Is there an equivalent test for Plastic products that would be similar to N-Vlaue in the testing of metals?		1050
Harry, We are a small recycling company and have need of a device to test plastics for different grades. i.e. injection grade HDPE, HMW, ect. Is a melt flow index tester what we need, or is there a more economical product we can use? Thanks		990
Harry, what is the general norm for testing MFI values on batches of recycled LDPE film grade material. 250 kgs 500kgs 750kgs? the material is being used by extuders in general use field.		993
HDPE Impact Force		694
Hi Harry Can you please tell me the temperature accuracy of the Tinius Olsen HDT, I know the resolution is 0.1degree C but I need the accuarcy		949
Hi Harry, I did the statistical study (Within the lab repeatability and reprocibality) in our lab for MFR usin MP600 extrusion plastometer. But the results found are veriating from 5 to 10%. It is known that the variation is contributed from sample, opera		964
Hi harry, I want to know about the cutter which can cut the specimen of PP for Charpy impact. It should be safe one.		879
Hi harry. I am doing my university project now. I was facing a problem in my MFI testing Method A. I keep on getting results which are greatly differ from each others, since every parameter in the test is remain the same. The results are very unstable. Wh		1019
Hi harry. I would like to know what the differences between flexural and tensile strength and modulus? Is it the similar of them?		1002
High temperature testing - lubrication for HW20 wedge grips		599
How can I get a operator manual for Extruder Plastometer MP600?		1173
I have a Tinius Olsen AD987 does the company offer any on site training?		1193
I have a Tinius Olsen AD987, Does your company offer any training?		792

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