Advantages of DuPont™ Tyvek® for the pharmaceutical industry 

Advantages of DuPont™ Tyvek®

DuPont understands the need to ensure contamination free work places and meeting strict pharma regulatory requirements. Av den här anledningen ger skyddskläder från DuPont tillförlitligt skydd för personal och även känsliga läkemedelsprocesser och produkter enligt vetenskaplig expertis inom personskydd. De har dessutom de unika egenskaperna hos det lätta och hållbara Tyvek® materialet. 

Tyvek® materialet tillverkas genom en blixtspinningsprocess och är gjord av starka, kontinuerliga polyetenfibrer av hög densitet. The fibers are thermally bonded into a tight, homogeneous and soft fabric that is intrinsically breathable, does not shed fibers (‘ linting ’) and has inherent barrier properties, i.e. not reliant on a thin applied coating or layer. Den här unika kombinationen av barriärskydd och inbyggd andningsförmåga gör Tyvek® till ett idealiskt material för många olika skyddstillämpningar.  To learn more on protective powers of Tyvek® please go here.

Advantages of DuPont™ Tyvek®

Comparison of DuPont™ Tyvek® with other fabrics SMS and MPF

 

Comparison of DuPont™ Tyvek® with other fabrics SMS and MPF

Microporous film (MPF) fabrics are a bi-laminate material comprising a thin microporous film bonded to a spunbound polypropylene base. Sådana material har begränsad hållbarhet, eftersom allt barriärskydd försvinner när det skyddande filmlagret nöts. In addition, their low air-permeability characteristics make them much less breathable than other fabrics. This results in poor wearer-comfort and heat control. The performance of spunbound/meltblown/spunbound (SMS) fabrics relies on a meltblown polypropylene layer sandwiched between two open polypropylene layers. This inner polypropylene layer functions as the main filter for particles. SMS material har dock ofta begränsad hållbarhet och relativt dålig barriärprestanda på grund av den relativt öppna fiberstrukturen. In addition, their high air permeability characteristics significantly compromise the barrier properties of the fabric making it only really appropriate for very basic protection and as a dirt barrier.

Abrasion: The figure illustrates fabric durability after 10 cycles of abrasion. Vid första anblicken förblir SMS materialet opåverkat, men det har lägre prestandanivå. MPF skyddsbarriären påverkas. The film gets abraded very easily and one can see that there are holes in the film. Only Tyvek® remains unaffected and has the highest protection level

Abrasion: Simulation of wear and tear in everyday use.

abrasion

 

The effects of abrasion on fabric efficiency: Fabric abrasion can seriously undermine the protective efficiency of a fabric. For example, fabrics that rely on thin coatings or have an inherently weak physical structure can quickly and easily lose their resistance to penetration under operating conditions. This loss of protection is particularly dangerous because in many cases the damage is not readily apparent or is not discovered until after an exposure occurs. The susceptibility of some fabrics to a severe deterioration in penetration resistance following abrasion can be seen in the following hydrostatic pressure test. Hydrohead is an indicator for liquid barrier performance. It determines the resistance of a fabric to water penetration under slight pressure. Prior to the abrasion test Microporous Film offers the best resistance to liquid pressure. But after just 10 cycles of abrasion, its performance takes a spectacular dive, while SMS is less affected but starts from a much lower performance level, and Tyvek® continues to protect. After abrasion, Tyvek® penetration performance is the highest.

Liquid barrier performance. Vattenpelare: EN 20811. Before and after 10 cycles of abrasion (EN 530 - Method 2).

permation data

 

Permeation data: When it comes to protective apparel, it is crucial to differentiate between penetration and permeation. Penetration is the physical process whereby a liquid, vapour or gas passes through the material via ‘pores’ or ‘holes’ in the fabric. It is more relevant when referring to particle penetration of a fabric or whole suit. Permeation is the process by which a chemical, in the form of a liquid, vapour or gas, moves through protective clothing material on a molecular level. The standard test duration for permeation is up to 8 hours or until permeation has been detected.

A protective clothing material with excellent results in the penetration test may give only poor protection when exposed to the same chemical in larger quantities and/or for extended time. To determine whether a protective clothing material with a low penetration index is really a protection against a specific liquid chemical, the chemical permeation data needs to be consulted.

Knowing the toxicity or consequences of short- or long-term exposure to a hazard is essential. With this in mind, consider whether a coverall has been tested to the following standard: SS-EN ISO 6529, som ger information om materialets motstånd mot permeation och penetration av kemikalier när kemikalien testas i minst 10 och upp till 480 minuter. Mer information finns i

bruksanvisningen som medföljer DuPont produkternas emballage, där permeationsdata för olika kemikalier anges. Detailed permeation data for over than 450 chemicals can be accessed on www.safespec.dupont.co.uk.

Total Inward Leakage: Vid en jämförelse av barriärprestandan för DuPont™ Tyvek® overaller av typ 5 med andra dräkter av typ 5 som är tillverkade av MPF (Microporous Film (mikroporös film)) och SMS (Spunbond-Meltblown-Spunbond (spinnbunden-smältblåst-spinnbunden)), uppvisar modeller tillverkade av Tyvek® ett betydligt mindre  genomsnittligt totalt inläckage  (TILA) enligt SS-EN 13982-2* med ett genomsnittligt värde på mindre än 1 %. The Type 5 product standard allows for an inward leakage of up to 15% in 8 out of 10 suits tested.

Total Inward Leakage (TILA): Average of the 10 suits and all activities EN ISO 13982 - (1 and 2). Dry particles Sodium Chloride NaCl 0,6 μm.

suit tests

 

Comfort and breathability: Comfort is a somewhat subjective and personal matter but some key comfort factors frequently cited in wearer trials include:

·         Garment design: ample freedom of movement when bending/stretching.

·         Breathability: plaggets förmåga att låta svett avdunsta och släppa igenom fukt.

·         Känslan mot huden, mjukhet.

·         Plaggets vikt.

·         Att bära underkläder av exempelvis bomull som absorberar svett förbättrar känslan på huden.

·         Att bära underkläder med långa ärmar och ben.

Tyvek® materialet från DuPont har en patentskyddad nonwoven-struktur som ger ett skyddande material som faktiskt låter fukt passera. Materialet är tillverkat av högdensitetspolyeten (HDPE, High Density Polyethylene) med ultrafina, kontinuerliga fibrer som spinnbinds till ett tåligt, lätt, homogent material med inbyggd andningsförmåga tack vare den mikroskopiska gitterstrukturen. This inherent ability to evacuate body moisture results in greatly improved wearer comfort in many Type 4, 5 and 6 applications. Med sin öppna struktur avlägsnar SMS overaller fukt mycket bättre än mikroporös film. Tyvek® meets quite good performances during sweating. Microporous Film is the material that takes the longest time to remove humidity.

humidity tyvek