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1. GORE-TEX FABRIC
Under the faculty
 Dr. MOUMITA BERA(Assistant professor)
Presented by
 RAVI PAL
 VIKAS KUMR
 KISHAN SINGH

2. INDEX
Intoduction

3. Introduction
• Gore-Tex is a waterproof, breathable fabric membrane.
• Gore-Tex can repel liquid water while allowing water vapor to pass through.
• It is designed to be lightweight, waterproof fabric for all-weather use.
• It is composed of stretched polytetrafluoroethylene (PTFE), which is more
commonly known by the generic trademark Teflon. The material is formally known
as the generic term expanded PTFE (ePTFE).

4. Logo of Gore-Tex

5. History of Gore-Tex
• Before 1968 The Human’s biggest Enemy was rainfall.To avoid the new weapon
comes which is called Gore – Tex
• Which is invented by an English Man
by Wilbert L. Gore and Gore’s son, Robert W. Gore.
• In 1969, Bob Gore stretched heated rods of polytetrafluoroethylene (PTFE)
and created expanded polytetrafluoroethylene (ePTFE).
The solid PTFE unexpectedly stretched about 800%,
forming a microporous structure that was about 70%
air.It was introduced to the public under the trademark
Gore-Tex.

6. Structure
ePTFE has a porous microstructure composed of long, narrow fibrils that
intersect at nodes. Increasing the processing temperature or increasing the
strain rate leads to more homogenous expansion with more spherically
symmetric pores and more intersections between fibrils.[11] The formation of
ePTFE is enabled by the unwinding of PTFE molecules to create large pores
within the structure. This favors highly ordered, crystalline PTFE that allows
the molecules to disentangle more easily and uniformly when stretched. The
porosity is largely determined by the stretching temperature and rate.
Changing the stretching rate from 4.8 m/min to 8m/min can increase the
porosity from 60.4% to 70.8%.[1

7. Processing
The GORE-TEX production process involves three main steps:
1. PTFE production
First, PTFE is produced in the form of rods, blocks, or other large, solid
shapes. As the polymer form of tetrafluoroethylene (TFE), this process
begins with forming TFE by combining fluorspar, hydrofluoric acid, and
chloroform. Upon exposure to heat, these three substances combine, and
the resulting TFE takes on a gas form at room temperature.
2. Stretching
The resulting blocks of PTFE are then heated again and stretched
rapidly to form a thin filament. In most cases, the resulting ePTFE is
formed into large sheets that can then be cut into various shapes once
cool.

8. 3. Bonding with polyurethane
GORE-TEX features an ePTFE layer with a polyurethane (PU) layer underneath.
These two materials are bonded together after PTFE is stretched into ePTFE.
4. Adding to garments and other items
In most cases, GORE-TEX is sewn underneath the uppermost layer of a garment.
As a result, water can seep through the top layer, but it is stopped once it reaches
GORE-TEX. In shoes and gloves, GORE-TEX is commonly added in the form of a
bootie, but the W.L. Gore corporation’s recently developed GORE-TEX Invisible
Fit melds directly with the outer layer of a shoe.

9. Application

10. Where is GORE-TEX fabric produced?

11. How much does GORE-TEX fabric cost?
GORE-TEX is one of the most expensive synthetic
fabrics.

15. Thank You