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434272

Sigma-Aldrich

Polyethylene

Ultra-high molecular weight, surface-modified, powder, 34-50 μm particle size

Sinonimo/i:

UHMWPE

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100 G
CHF 87.30
500 G
CHF 317.00

CHF 87.30

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Cambia visualizzazione
100 G
CHF 87.30
500 G
CHF 317.00

About This Item

Formula condensata:
H(CH2CH2)nH
Numero CAS:
9002-88-4
Numero MDL:
MFCD00084423
Codice UNSPSC:
12162002
ID PubChem:
24867184
NACRES:
NA.23

CHF 87.30

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Livello qualitativo

100

Stato

powder

PM

(Ultra-high molecular weight)

Dimensione particelle

34-50 μm

Punto di fusione

144 °C

Temp. transizione

Tm (DSC) 144 °C (at peak)

Densità

0.94 g/mL at 25 °C

Stringa SMILE

C=C

InChI

1S/C2H4/c1-2/h1-2H2
VGGSQFUCUMXWEO-UHFFFAOYSA-N

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Categorie correlate

Applicazioni

Additive to unsaturated polyesters, epoxides and other polymers to impart the unique properties of UHMWPE. Used in industrial parts, coatings and wear surfaces at 10-40 wt. %.

Caratteristiche e vantaggi

Polar surface groups assist chemical and physical bonding to matrix material. Contributes superior abrasion resistance, reduced coefficient of friction, enhanced tear strength and improved moisture resistance. Easier to process in particle form than molten UHMWPE.

Stato fisico

Particle surface is modified to contain acid and hydroxy groups.

Codice della classe di stoccaggio

11 - Combustible Solids

Classe di pericolosità dell'acqua (WGK)

WGK 3

Punto d’infiammabilità (°F)

Not applicable

Punto d’infiammabilità (°C)

Not applicable

Dispositivi di protezione individuale

Eyeshields, Gloves, type N95 (US)

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Certificati d'analisi (COA)

Lot/Batch Number
MKCT3568
MKCT7492
MKCV4850
MKCR2798
MKCP5921

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High Density Polyethylene United States Pharmacopeia (USP) Reference Standard

USP

1546707

High Density Polyethylene

Polyethylene Linear low density, melt index 1.0 g/10 min (190°C/2.16kg)

Sigma-Aldrich

428078

Polyethylene

Poly(vinyl chloride) low molecular weight

Sigma-Aldrich

81388

Poly(vinyl chloride)

Polyethylene - U.H.M.W. (UHMW PE), film, thickness 0.2 mm, L 2 m

GF60683902

Polyethylene - U.H.M.W.

Andrés Felipe Cruz-Pacheco et al.
Polymers, 12(5) (2020-05-23)
Polyaniline (PANI) has recently gained great attention due to its outstanding electrical properties and ease of processability; these characteristics make it ideal for the manufacturing of polymer blends. In this study, the processing and piezoresistive characterization of polymer composites resulting
Nina Bloecher et al.
Biofouling, 29(3), 237-246 (2013-02-27)
The hydroid Ectopleura larynx is one of the main fouling organisms on salmon aquaculture cages in Norway; this study investigated novel surface materials and microtopographies to deter its settlement. The settlement preferences of hydroid larvae for 12 materials with wettabilities
Ryan M Baxter et al.
Journal of biomedical materials research. Part B, Applied biomaterials, 101(3), 467-475 (2013-02-26)
Despite the widespread implementation of highly cross-linked polyethylene (HXLPE) liners to reduce the clinical incidence of osteolysis, it is not known if the improved wear resistance will outweigh the inflammatory potential of HXLPE wear debris generated in vivo. Thus, we
Alicia E Leadford et al.
Pediatrics, 132(1), e128-e134 (2013-06-05)
Hypothermia contributes to neonatal mortality and morbidity, especially in preterm and low birth weight infants in developing countries. Plastic bags covering the trunk and extremities of very low birth weight infants reduces hypothermia. This technique has not been studied in
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The Journal of bone and joint surgery. American volume, 95(13), 1193-1197 (2013-07-05)
Ceramic femoral heads produce less wear of the opposing polyethylene than do metal femoral heads in wear simulation studies. This is a matched-pair analysis of the wear of ceramic and metal femoral heads on conventional polyethylene in uncemented total hip
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Questions

1–4 of 4 Questions  

  1. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

      Helpful?

  2. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

      Helpful?

  3. What is the surface modification of 434272 (Polyethylene, Ultra-high molecular weight)?

    1 answer

    1. The particle surface is modified to contain acid and hydroxy groups. This UHMWPE undergoes treatment with F2 in a process called fluoro oxidation, resulting in approximately 10-15 atom % F, 10-15 atom % O, and the rest being carbon on the surface. This modification allows for surface energies of up to 60 dynes/cm (typically 50 dynes/cm), making them easily dispersible in CASE (coatings, adhesives, sealants, and elastomers) formulations. Additionally, it imparts abrasion resistance, wear resistance, reduces the coefficient of friction, and increases mechanical strength.

      Furthermore, the amount of surfactants is negligible compared to polyethylene for this particle size. Assuming that carboxylic acids and hydroxyls form a layer approximately 1 nm thick (in reality probably even less), the volume of this layer relative to the volume of a 45 µm particle is estimated to be around 0.01%, resulting in a similar mass ratio.

      Helpful?

  4. Can you please specify, what is the modification type of surface-modified UHMWPE? Does this modification provide hydrophylicity to polymer surface? Do you have any hydrophylic UHMWPE powder available?

    1 answer

    1. The particle surface of this product has been modified to increase the hydrophilicity.
      To further discuss, we kindly ask you to navigate to the link https://www.sigmaaldrich.com/techservice, click on "Product Technical Inquires" under the Products Section with all the required information so that a member of our team can reach out to you to assist further. Thank you.

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