Thank you for an excellent presentation. I was wondering if I can HDT test a polyurethane foam. If yes would there be a separate test standard for that i.e subjected load value?
Our specialty is certainly thermoplastics and composites, and admittedly we are less experienced with polyurethane foam. However, yes, a foam can be tested for Heat Deflection Temperature, as can any material. Of course, there are two main load choices that are standard for HDT testing....66psi (.46 MPa) and 264psi (1.8 MPa). Typically, one of the loads above are selected based on the stiffness of the material being evaluated. The lower 66 psi load is often selected for less stiff materials, like PTFE, UHMW-PE, elastomers, and foams. The higher 264 psi load is used for the stiffer thermoplastic materials. Thank you for your question!
Thx, very clear video. But how can I get 66PSI load? What weight should I place in the center of supported test object? Should I calculate it from bending modulus?
If using ASTM D648, you will need to calculate the Force to apply to the sample based on the three-point bending equation. Force (N) = 2/3 [ Stress (MPa) x Sample width (mm) x (Sample thickness (mm))^2] / Sample length (mm). The Stress value used should be either 0.455Mpa (66psi) or 1.82 MPa (264psi) as defined by the ASTM. The Sample length is actually defined by the distance between the support spans, not the actual sample bar length. I hope that clarifies.
Hello. I hope you can help me with a query. I need to know in which material each force indicated by ASTM in HDT and VICAT is applicable, or where I can find that information. I am evaluating PVC and CPVC material, but I don't know which of the two weights to use for each test.
Hello and thank you for your question! The HDT test measures a material's ability to handle a load with temperature, while the VICAT test measures the temperature at which a material loses its stability-form or shape. I am much more familiar with the ASTM test for stock shapes in which the ASTM D648 test standard calls for the use of one of two test loads....either 264 psi (1.8 Mpa) or 66 psi (0.45 MPa). For PVC or CPVC, you could use either option depending on which may be more applicable for your application. There are different tests for the VICAT, and it appears they will use either a load of 50N or 10N depending on the test chosen.
Hello.. Thanks for the video. Could you please suggest how HDT shall platy the role of Operatin temperature? My product operating temperature is -40 deg to +85 deg C.
The HDT is simply the result of a standardized laboratory test which identifies the temperature at which a material will deform under a given load (typically 264 psi). If you have an application with an operating temperature up to +85C, and you require some level of strength and stiffness, then you will want to select a material with an HDT which is higher than 85C. If you have not already watched them, you may wish to review our other videos on Continuous Operating Temperature (Boedeker TechTalk Episode 1) and on DMA Curves (Boedeker TechTalk Episode 4). Choosing the right material for your application is often a balance of understanding several of a material's properties including its HDT and CUT, along with understanding its strength and stiffness retention at temperature (DMA data).
Thanks for this video! I’m currently researching hdt and this was very helpful. There’s still something I don’t quite get about hdt though - if the hdt varies depending on a part’s geometry, then doesn’t that mean that the temperature value attained from this test is useless in any application other than one that uses a polymer bar of the exact same dimensions used in the test?
Liam, thank you for your question. As with most ASTM tests, the configuration of the test sample and the conditions in which the test are administered play a dominant role in the results. I view most of the datasheet properties for polymers as data to compare materials to each other. One has to understand that given these standard conditions, you can compare how one material performs versus another? With HDT, as you suggest, the test only tells you when the material of that given configuration starts to deform under the given load. If you have a higher load, the material will most likely deform at a lower temperature, and vice versa. The same will most likely be true for larger cross-sections. Of course, this is also why FEA design modeling can be extremely helpful. Thanks for the dialogue!
The HDT and the melting point of a plastic are really not related, except top say that the HDT is really the point at which the material is soft enough to deform under load. Please watch our video on DMA on this same channel which talks about the different stages that a polymer goes through with temperature change. This may help you relate the two. The HDT occurs during the transition of the polymer from the "glassy rigid" stage to the "glass transition" stage. Following these two stages the material enters the "rubbery plateau" where it is nearly fully flexible, and then onto the "melt flow" stage. The DMA for a material is one of the best ways to characterize a material's performance with temperature. Thanks for your question!
Hello my name is Ulrich and I come from Denmark I has som questions about different plastic materials. 1st question. is it possible to make a chassi frame for a car ore a truck? 2nd question. If it is possible to make a chassi frame out of plastic, What lifetime can I expect from a chassi made of plastic 10 years 20 years? 3th question. Will it be possible for your factory to make a prototype chassi? Ps make som more information videos about the use af the different plastic material types and there application, there strong and weakness and so on.
Hello! Thanks for your comments. To best answer your specific questions, you may certainly reach out to Boedeker Plastics direct via our Contact page on our website. (www.boedeker.com/Contact-Us). We will be happy to have one of our technical staff directly answer your individual questions. Thank you!
That sounds great Brian, here is a link to all of our literature www.boedeker.com/Documents give us a call to schedule a tour. We look forward to your visit.
Thanks for this video! Helped me pick out the right FDM filament for making a prototype high power COB LED mount.
Excellent. Thanks for your comment. I'm glad this video was useful for you!
.
Nice explained , thanks...
Glad you liked it
Thank you for an excellent presentation. I was wondering if I can HDT test a polyurethane foam. If yes would there be a separate test standard for that i.e subjected load value?
Our specialty is certainly thermoplastics and composites, and admittedly we are less experienced with polyurethane foam. However, yes, a foam can be tested for Heat Deflection Temperature, as can any material. Of course, there are two main load choices that are standard for HDT testing....66psi (.46 MPa) and 264psi (1.8 MPa). Typically, one of the loads above are selected based on the stiffness of the material being evaluated. The lower 66 psi load is often selected for less stiff materials, like PTFE, UHMW-PE, elastomers, and foams. The higher 264 psi load is used for the stiffer thermoplastic materials. Thank you for your question!
Hey..I'm from CIPET college in India
Thanks for watching Ratul
@@boedekerplastics thanks for helping me....on exams
Thx, very clear video. But how can I get 66PSI load? What weight should I place in the center of supported test object? Should I calculate it from bending modulus?
If using ASTM D648, you will need to calculate the Force to apply to the sample based on the three-point bending equation. Force (N) = 2/3 [ Stress (MPa) x Sample width (mm) x (Sample thickness (mm))^2] / Sample length (mm).
The Stress value used should be either 0.455Mpa (66psi) or 1.82 MPa (264psi) as defined by the ASTM. The Sample length is actually defined by the distance between the support spans, not the actual sample bar length. I hope that clarifies.
Hello.
I hope you can help me with a query. I need to know in which material each force indicated by ASTM in HDT and VICAT is applicable, or where I can find that information.
I am evaluating PVC and CPVC material, but I don't know which of the two weights to use for each test.
Hello and thank you for your question! The HDT test measures a material's ability to handle a load with temperature, while the VICAT test measures the temperature at which a material loses its stability-form or shape. I am much more familiar with the ASTM test for stock shapes in which the ASTM D648 test standard calls for the use of one of two test loads....either 264 psi (1.8 Mpa) or 66 psi (0.45 MPa). For PVC or CPVC, you could use either option depending on which may be more applicable for your application. There are different tests for the VICAT, and it appears they will use either a load of 50N or 10N depending on the test chosen.
Hello.. Thanks for the video. Could you please suggest how HDT shall platy the role of Operatin temperature? My product operating temperature is -40 deg to +85 deg C.
The HDT is simply the result of a standardized laboratory test which identifies the temperature at which a material will deform under a given load (typically 264 psi). If you have an application with an operating temperature up to +85C, and you require some level of strength and stiffness, then you will want to select a material with an HDT which is higher than 85C. If you have not already watched them, you may wish to review our other videos on Continuous Operating Temperature (Boedeker TechTalk Episode 1) and on DMA Curves (Boedeker TechTalk Episode 4). Choosing the right material for your application is often a balance of understanding several of a material's properties including its HDT and CUT, along with understanding its strength and stiffness retention at temperature (DMA data).
@@boedekerplastics THank you for your response. this helps..
👍👍
Thank you for the thumbs up!
Thanks for this video! I’m currently researching hdt and this was very helpful. There’s still something I don’t quite get about hdt though - if the hdt varies depending on a part’s geometry, then doesn’t that mean that the temperature value attained from this test is useless in any application other than one that uses a polymer bar of the exact same dimensions used in the test?
Liam, thank you for your question. As with most ASTM tests, the configuration of the test sample and the conditions in which the test are administered play a dominant role in the results. I view most of the datasheet properties for polymers as data to compare materials to each other. One has to understand that given these standard conditions, you can compare how one material performs versus another? With HDT, as you suggest, the test only tells you when the material of that given configuration starts to deform under the given load. If you have a higher load, the material will most likely deform at a lower temperature, and vice versa. The same will most likely be true for larger cross-sections. Of course, this is also why FEA design modeling can be extremely helpful. Thanks for the dialogue!
@@boedekerplastics Thanks very much for your detailed reply, this has helped clear things up for me!
Hello Sir,
How do you relate HDT with melting point of plastic parts ,is there any relation?
The HDT and the melting point of a plastic are really not related, except top say that the HDT is really the point at which the material is soft enough to deform under load. Please watch our video on DMA on this same channel which talks about the different stages that a polymer goes through with temperature change. This may help you relate the two. The HDT occurs during the transition of the polymer from the "glassy rigid" stage to the "glass transition" stage. Following these two stages the material enters the "rubbery plateau" where it is nearly fully flexible, and then onto the "melt flow" stage. The DMA for a material is one of the best ways to characterize a material's performance with temperature. Thanks for your question!
How wide is the test bar and what width? The standard size?
The ASTM D648 test method calls for a test piece that measures 5" x ½" x ¼".
Hello my name is Ulrich and I come from Denmark
I has som questions about different plastic materials.
1st question. is it possible to make a chassi frame for a car ore a truck?
2nd question. If it is possible to make a chassi frame out of plastic, What lifetime can I expect from a chassi made of plastic 10 years 20 years?
3th question. Will it be possible for your factory to make a prototype chassi?
Ps make som more information videos about the use af the different plastic material types and there application, there strong and weakness and so on.
Hello! Thanks for your comments. To best answer your specific questions, you may certainly reach out to Boedeker Plastics direct via our Contact page on our website. (www.boedeker.com/Contact-Us). We will be happy to have one of our technical staff directly answer your individual questions. Thank you!
I need your company send me pamphlet I’m thinking about taking a tour of your company.
That sounds great Brian, here is a link to all of our literature www.boedeker.com/Documents give us a call to schedule a tour. We look forward to your visit.