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  • Users: campp
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  1. campp

    vulcanisation

    Hello, An incomplete vulcanisation (time, temperature, curing agent content) process could lead to sticky and less hardness rubber product? The DSC is a good technique to verify the vulcanisation state? Residual enthalpy is visible in the first heating in relation with second heating (heating up...
  2. campp

    PVC infrared spectra

    Hello, Could you tell me how to explain the difference between the spectra for two plasticized PVC, please? Thank you in advance!https://files.engineering.com/getfile.aspx?folder=14fdd188-2150-45d4-ac19-01703fa37d48&file=PVC_FTIR.JPG
  3. campp

    tolerances MFI

    It's about PBT GF10. Raw material have 32 - 33cm3/10min, while the parts have 46 - 49cm3/10min. This variation is enough to consider that the parts are degraded during the injection process? Generally, what would be the allowed limits for the parts to consider them Ok in relation to the raw...
  4. campp

    tolerances MFI

    Hello, Does anyone know which is the permissible tolerances for MVR to ensure that the material is not degraded during the injection process? I know that the values of MVR is influenced by process conditions, humidity of polymers and storage. How can evaluate the degradation level of material...
  5. campp

    PBT-ASA vs PBT-SAN

    Hello! Can you tell me which is the difference between PBT-ASA and PBT-SAN in terms of properties and applications, please? The only difference ASA/SAN is the acrylate rubber that is an impact modifier. ASA/SAN is added to PBT only for improved the weather resistance? Thank you!
  6. campp

    P/E material with quality problems ?

    Hello, I am studying a PP copolymer material; DSC was performed using a heat/cool/heat methodology (10°C/min). The melting transition in the first heating is OK, but in the second heating, after slow cooling (-10°C/min), the material showed irregularities on the melting transition. It is known...
  7. campp

    contaminant from improper cleaning of injection machine

    Hello, Could you tell me what is the influence of the contaminant PELD or PEHD (about 1%)in PBT, PET or PA parts. The source of contamination --> improper cleaning of injection machine. The mechanical properties are severely affected? Generally small percents of contaminant from injection...
  8. campp

    migration of the charge on the rubber surface

    it is mineral filler, sorry
  9. campp

    migration of the charge on the rubber surface

    Hello, I would like to know what are the factors that determines the migrations of the charge (CaCO3, silicates) on the rubber surface? This film reduces the ability of the rubber to adhere on the other elements when joined. Thank you.
  10. campp

    compatibility PBT with PE

    Hello, Please tell me how influence the mechanical properties of PBT presence of PEHD or PELD. Thank you.
  11. campp

    Defect injection

    I don't know tip fed, I am sorry. Thank you all.
  12. campp

    Defect injection

    total length - 260mm
  13. campp

    Defect injection

    Hello, I have two parts (cavity 1 and 2) with different appearance (matte area on a larger surface on one part compared to the other) and I do not know if the injection parameters determined this effect and how they can influence the mechanical properties of parts? It is possible the melt front...
  14. campp

    thermal stability of ASA

    Hello, Do you know what is the thermal resistance, generally, for ASA? It's influenced of the polymer formulation (content of SAN)? If so, what kind of analyse is advisable to show the proportion of components? Ii is possible that a piece from ASA to deform after sun exposure (during very...
  15. campp

    masterbatch for polymers

    Hello, I know that a masterbatch is a solid or liquid additive for plastic used for coloring plastics. I 'm not sure if each type of polymer need a certain type of masterbatch. For polyolefins may be used masterbatch support polyethylene, but for polyamide may be used the same type? The...
  16. campp

    report components in the blends ABS-PC

    Hello everyone, I want to know if the analysis DSC can give the approximatives informations about the ratio of composants in the blends ABS-PC. I used Δcp PC pure (about 0.29J/gK in literature) and Δcp PC blend (about 0.10J/gK in analysis) and I acquired a report ABS/PC=2/1. I don't know if...

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