Energy Efficiency


Hanita VIP Glossary

Hanita VIP Glossary

Hanita VIP Glossary


Aerogel is a synthetic porous ultralight material derived from a gel, in which the liquid component of the gel has been replaced with a gas. The result is a solid with extremely low density and thermal conductivity.

ALT  Accelerated Life Time test

A method developed to accelerate testing on products in various industries, used to test the performance of VIP panels and predict their life time.

Aluminum Foil

Aluminium foil is aluminium prepared in thin metal leaves, aluminum foils are pinhole free only from a thickness of 17um and above.


A film constructed from two barrier layers and one sealing layer.

Core Material

The inner materials of the VIP, commonly used materials are Fumed Silica or fiber glass.


Cryogenics is the study of the production of very low temperature (below −150 °C, −238 °F or 123 K) and the behavior of materials at those temperatures.

Cryogenic Thermal insulation

Thermal insulation in Cryogenic temperatures.

Delta T

The difference between two temperatures T1 and T2.       


Substance, such as calcium oxide, that absorbs water and is used to remove moisture.


Energy Star (trademarked ENERGY STAR) is an international standard for energy efficient consumer products originated in the USA.


Ethylene vinyl alcohol (EVOH) is a formal copolymer of ethylene and vinyl alcohol. Because the latter monomer mainly exists as its tautomer acetaldehyde, the copolymer is prepared by polymerization of ethylene and vinyl acetate to give the ethylene vinyl acetate (EVA) copolymer followed by hydrolysis      

Fiber Glass

A material made up of very fine fibers of glass. Fiberglass is resistant to heat and fire and is used to make various products, such as building insulation and boat hulls. Because the fibers in fiberglass are capable of transmitting light around curves, fiberglass is an important component of fiber optics.

Fumed Silica

An exceptionally pure form of silicon dioxide made by reacting silicon tetrachloride in an oxy-hydrogen flame. Particles range from 0.007 to 0.05 μm and tend to link together by a combination of fusion and hydrogen bonding to form chain-like aggregates with high surface areas.


A substance introduced into a vacuum to remove traces of gas by adsorbing the residual gas and lowers the pressure.


Gas Transmission Rate: The rate at which a gas will diffuse through a given area of a surface at standard pressure and temperature. The result is usually expressed as the volume or weight (CC) of gas, per 24 hours.


High-density polyethylene (HDPE) is a polyethylene thermoplastic made from petroleum. Known for its large strength to density ratio, HDPE is commonly used in the production of plastic bottles, corrosion-resistant piping and plastic lumber.

Heat Flow

Heat flows in response to a temperature gradient. If two points are in thermal contact and at different temperatures, T1 and T2 then energy is transferred between the two in the form of heat, Q.  

Hybrid Envelope

VIP envelope constructed of one side metalized film and other side aluminum foil.   


Lambda (measured in Watts per meter per degrees Kelvin, W/mK) of a material represents the quantity of heat that passes through a meter thickness per square meter per time unit with one degree difference in temperature between the faces.

Lambda declared

A measure used in VIP for construction by DIBT, to define the maximum Lambda of a VIP through all its lifespan

Lambda effective

Lambda value of a VIP which takes into account the thermal bridge effect influence.


Low-density polyethylene (LDPE) is a thermoplastic made from the monomer ethylene. LDPE is defined by a density range of 0.910–0.940 g/cm3.


Leadership in Energy and Environmental Design (LEED) consists of a suite of rating systems for the design, construction and operation of high performance green buildings, homes and neighborhoods, developed by the U.S. Green Building Council (USGBC).

Life time calculator

Tool developed by Hanita Coatings to enable predicting the life time of the VIP in the application based on certain parameters dictated by the application.


Linear low-density polyethylene (LLDPE) is a substantially linear polymer (polyethylene), with significant numbers of short branches, commonly made by copolymerization of ethylene with longer-chain olefins. Linear low-density polyethylene differs structurally from conventional low-density polyethylene (LDPE) because of the absence of long chain branching.


Liquefied natural gas - natural gas (predominantly methane, CH4) that has been converted to liquid form for ease of storage or transport.


Medium-density polyethylene (MDPE) is a type of polyethylene defined by a density range of 0.926–0.940 g/cm3. It is less dense than HDPE.        


Metallization or metallizing is the general name for the technique of coating metal on the surface of non-metallic objects such as polymeric films.


Metallic VIP, a system developed by Hanita, constructed from a metallic core and a barrier layer to measure the pressure increase inside the VIP.


Moisture vapor transmission rate (MVTR), also water vapor transmission rate (WVTR), is a measure of the passage of water vapor through a substance. The most common international unit for the MVTR is g/m²/day. In the USA, g/100in²/day is also in use, which is approximately 1/15 of the value of g/m²/day units.


Nitrogen is a chemical element with symbol N and atomic number 7. Elemental nitrogen is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09% by volume of Earth's atmosphere.


Nitrogen Transmission Rate, Same as GTR but specifically refers to nitrogen.


Any of a family of high-strength, resilient synthetic polymers, the molecules of which contain the recurring amide group CONH. Used in VIP laminates to add mechanical strength to the laminate.


Oxygen Transmission Rate, Same as GTR but specifically refers to oxygen.

Out gassing

The release of a gas that was dissolved, trapped, frozen or absorbed in a material.


A colorless, odorless, gaseous element constituting about one-fifth of the volume of the atmosphere and present in a combined state in nature.


Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently. It is an industrial mineral and a commercial product useful for its light weight after processing.

Permeability, permeation

Permeation (also called imbuing) is the penetration of a permeate (such as a liquid, gas, or vapor) through a solid.

Pipe Insulation

Pipe Insulation is thermal or acoustic insulation used on pipework. Where pipes operate at below-ambient temperatures, the potential exists for water vapor to condense on the pipe surface. Moisture is known to contribute towards many different types of corrosion, so preventing the formation of condensation on pipework is usually considered important.

Polyester, PET Film

Polymeric film made from stretched polyethylene terephthalate (PET), typified by high tensile strength, chemical and dimensional stability, electrical insulation and gas and aroma barrier properties.


A plastic polymer, (C3H5)n, Used in VIP to give better mechanical strength to the laminate.

Pore size

Pore size is a measure of the diameter of the largest space where air is trapped, usually referred to the core material specific quality.


Proprietary Surface Treatment developed by Hanita for metallized laminates, providing an outstandingly low Gas Transmission Rate similar to that of Aluminium foil.

R Value

The R-value is a measure of thermal resistance [1] used in the building and construction industry. Under uniform conditions it is the ratio of the temperature difference across an insulator and the heat flux (heat transfer per unit area per unit time, q  ) through it or   r

Relative Humidity

Relative humidity is the ratio of the partial pressure of water vapor in an air-water mixture to the saturated vapor pressure of water at a prescribed temperature. The relative humidity of air depends not only on temperature but also on the pressure of the system of interest.


Residual Gas Analysis (RGA) is an analytical technique used for identifying the gases present in vacuum environments.

Sealable PP

Specific polypropylene film which is sealable in nature and can act as the sealing layer for VIP bags.

Side Permeation

Permeation is the penetration of a permeate (such as a liquid, gas, or vapor) through a solid. Side permeation refers to the permeation through the sealing layer of the VIP.


Spinning Rotor Gauge (SRG) line is a high-vacuum gauge that operates by measuring the amount of viscous drag on a magnetically-levitated spinning ball, which is directly related to the number of molecules in the chamber (i.e. pressure).

Thermal Bridge

Refers to the conductance of heat through the VIP envelope. This phenomena increases greatly when an aluminum foil envelope is used, due to the high thermal conductivity of thick aluminum foil. 

Thermal conductivity

Thermal conductivity is defined as the quantity of heat (Q) transmitted through a unit thickness (L) in a direction normal to a surface of unit area (A) due to a unit temperature gradient (ΔT) under steady state conditions and when the heat transfer is dependent only on the temperature gradient.


A film constructed from three barrier layers and one sealing layer

U Value

A U value is a measure of heat loss in a building element such as a wall, floor or roof. It can also be referred to as an ‘overall heat transfer co-efficient’ and measures how well parts of a building transfer heat. Units are w/m2K


Vacuum Insulation Panel is a form of thermal insulation consisting of a nearly gas-tight envelope surrounding a rigid core, from which the air has been evacuated.  It has 5-10 times better insulation properties then standard materials.

Water Intake

A method developed to calculate the water permeation into a VIP with a specific protocol.


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