SlideShare a Scribd company logo
1 of 20
Download to read offline
RTV silcone mould
Presnted by…………………………..
shubham maurya
(18MECH16)
CNTRE FOR ADVANCED STUDIES
A.K.T.U
LUCKNOW,UP
Contents
Introduction
basic terms
RTV Silicone
RTV-1
RTV-2
Steps used in RTV SILICONE mould making
Advantages
Disadvantages
Application
3
Intoduction
◈
Silicone rubber is an excellent moulding material used mainly where minute
surface detail is required usually in conjunction with deep undercuts. There
is virtually no shrinkage and is recommended where a larger number of casts
are required.
◈ As there are many types of silicone rubber available this information has
been designed to give a general introduction to its use.
◈ Details such as cure time and percentage of curing agent to add will be stated
on the containers.
4
Basics terms
What is casting ?
Casting is a manufacturing process in
which a liquid material is usually poured
into a mold, which contains a hollow
cavity of the desired shape, and then
allowed to solidify. ... Casting is most
often used for making complex shapes
that would be otherwise difficult or
uneconomical to make by other methods.
What is mould ?
Mold making is a vital process in which
a material is used for making themold of
the original model. Different materials
can be used for mold making process
depending on each one's needs and
preference. The common material used
for mold making process is the rubber.
5
Basics……….
What is pattern making ?
In casting, a pattern is a replica of
the object to be cast, used to
prepare the cavity into which
molten material will be poured
during the casting process .
Patterns used in sand casting may
be made of wood, metal, plastics or
other materials
◈ Pattern
6
RTV SILICONE
7
RTV silicone is a liquid silicone compound that cures at room
temperature to form a flexible rubber. This can be either an Adhesive
Sealant, Moulding Rubber or Electronic Encapsulate Potting
Compound.
The term RTV is means Room Temperature Vulcanising.
Room-temperature vulcanizing (RTV) silicone =reactive oil-based
polymers + strengthening mineral fillers
There are two types of room-temperature vulcanizing silicone…
RTV-1 (ONE COMPONENT SYSTEM) RTV-2 (TWO COMPONENT SYSTEM)
Hardens due to the action of
atmospheric humidity, a catalyst,
and acetoxysilane .
Acetoxysilane+Humidity=acetic.
The curing process begins on the
outer surface and progresses
through to its core.
The product is packed in airtight
cartridges and is either in a fluid or
paste form. RTV-1 silicone has
good adhesion, elasticity, and
durability characteristics.
◈ Two-component products that,
when mixed, cure at room
temperature to a solid
elastomer, a gel, or a flexible
foam.
◈ RTV-2 remains flexible from
−80 to 250 °C (−112 to
482 °F).
◈ Break-down occurs at
temperatures above 350 °C
(662 °F), leaving an inert silica
deposit that is non-flammable
and non-combustible
8
RTV-2
9
◈ RTV-2 is used to make flexible moulds, as well as many technical parts
for industry and paramedical applications.
◈ They can be used for electrical insulation due to their dielectric
properties.
Steps used in RTV SILICONE mould making
◈ SIMPLE OPEN MOULD
10
Steps used in RTV SILICONE mould making
11
12
CARES TO BE TAKEN
◈ the mould box should then be
coated with a fine layer of
petroleum jelly.
◈ Allow to stand for
approximately 10 minutes
before pouring the bulk, hold
the container as low as possible
and pour in a thin stream.
◈ Mix the silicone rubber and if a
vacuum is not available paint
over the surface of the master
pattern with a thin coat.
◈ Leave to cure for 24 hours
before removing the mould.
13
Two Part Mould
◈ A part mould (split mould) is necessary where it is difficult to remove either
the master or the castings from an open mould.
◈ STEPS…..
◈ Pattern to be to be made with help of rapid prototyping system techniques.
14
Two Part Mould
◈
15
16
Advantages and
◈ RTV silicone rubber has
excellent release properties
compared to molds rubbers,
which is especially an
advantage when doing
production casting of resins
(polyurethane, polyester,
and epoxy).
◈ No release agent is required,
obviating post-production clean
up.
◈ Silicones also exhibit good
chemical resistance and high-
temperature resistance (205 °C,
400 °F and higher).
◈ For this reason, silicone molds
are suitable for casting low-
melt metals and alloys
(e.g. zinc, tin, pewter,
and Wood's metal)
17
Disadvantages
◈ RTV silicone rubbers are,
however, generally
expensive—especially
platinum-cure.
◈ They are also sensitive to
substances (sulfur-
containing modelling clay such
as Plastilina ) that may prevent
the silicone from curing .
◈ Silicones are usually very thick
(high viscosity), and must be
vacuum degassed prior to
pouring, to minimize bubble
entrapment.
18
References
◈ Jorge Cervantes, Ramón Zárraga, Carmen Salazar-Hernández "Organotin
catalysts in organosilicon chemistry" Appl. Organometal. Chem. 2012,
vol. 26, 157–163. doi:10.1002/aoc.2832
◈ ^ Jump up to:a b Hans-Heinrich Moretto, Manfred Schulze, Gebhard
Wagner (2005) "Silicones" in Ullmann's Encyclopedia of Industrial
Chemistry, Wiley-VCH, Weinheim. doi:10.1002/14356007.a24_057
◈ ^ "picsima-ii". picsima-ii. Retrieved 2017-01-05.
19
THANK YOU
20

More Related Content

What's hot

What's hot (20)

Die materials and technique of fabrication
Die materials and technique of fabricationDie materials and technique of fabrication
Die materials and technique of fabrication
 
Biocompatibility of dental materials
Biocompatibility of dental materialsBiocompatibility of dental materials
Biocompatibility of dental materials
 
Casting defects
Casting defectsCasting defects
Casting defects
 
Fillers in composite resins
Fillers in composite resinsFillers in composite resins
Fillers in composite resins
 
Different fabrication techniques of ceramics
Different  fabrication techniques of ceramicsDifferent  fabrication techniques of ceramics
Different fabrication techniques of ceramics
 
011.composites
011.composites011.composites
011.composites
 
Denture base resins/ cosmetic dentistry training
Denture base resins/ cosmetic dentistry trainingDenture base resins/ cosmetic dentistry training
Denture base resins/ cosmetic dentistry training
 
CASTING PROCEDURES AND DEFECTS
CASTING PROCEDURES AND DEFECTSCASTING PROCEDURES AND DEFECTS
CASTING PROCEDURES AND DEFECTS
 
Glass ionomer cement
Glass ionomer cementGlass ionomer cement
Glass ionomer cement
 
ZINC PHOSPHATE CEMENT
ZINC  PHOSPHATE  CEMENTZINC  PHOSPHATE  CEMENT
ZINC PHOSPHATE CEMENT
 
gypsum
gypsumgypsum
gypsum
 
Dental casting alloys
Dental casting alloysDental casting alloys
Dental casting alloys
 
Heat cure acrylic
Heat cure acrylicHeat cure acrylic
Heat cure acrylic
 
Dental Waxes
Dental WaxesDental Waxes
Dental Waxes
 
Denture bases
Denture basesDenture bases
Denture bases
 
ZINC OXIDE EUGENOL IMPRESSION PASTE (1).pptx
ZINC OXIDE EUGENOL IMPRESSION PASTE (1).pptxZINC OXIDE EUGENOL IMPRESSION PASTE (1).pptx
ZINC OXIDE EUGENOL IMPRESSION PASTE (1).pptx
 
Impression compound
Impression compoundImpression compound
Impression compound
 
METHODS OF STRENGTHENING DENTAL CERAMICS - Dr MEENU MERRY C PAUL
METHODS OF STRENGTHENING DENTAL CERAMICS - Dr MEENU MERRY C PAULMETHODS OF STRENGTHENING DENTAL CERAMICS - Dr MEENU MERRY C PAUL
METHODS OF STRENGTHENING DENTAL CERAMICS - Dr MEENU MERRY C PAUL
 
Casting procedure
Casting procedureCasting procedure
Casting procedure
 
Dental ceramics
Dental ceramicsDental ceramics
Dental ceramics
 

Similar to RTV silocone mould

Rtv silicon
Rtv siliconRtv silicon
Rtv siliconaalam98
 
Centroid silicone/PTFE/Butyl
Centroid silicone/PTFE/ButylCentroid silicone/PTFE/Butyl
Centroid silicone/PTFE/ButylCentroidPolymer
 
Momentive Silicone Conformal Coating Overview
Momentive Silicone Conformal Coating OverviewMomentive Silicone Conformal Coating Overview
Momentive Silicone Conformal Coating OverviewMomentive
 
Rongxin Cataloge
Rongxin CatalogeRongxin Cataloge
Rongxin CatalogeIvy Tan
 
Elastomeric impression materials
Elastomeric impression materialsElastomeric impression materials
Elastomeric impression materialsArunima Upendran
 
PVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdf
PVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdfPVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdf
PVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdfKoolLeisure
 
PVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdf
PVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdfPVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdf
PVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdfKoolLeisure
 
Fascinating Silicone Chemistry.pdf
Fascinating Silicone Chemistry.pdfFascinating Silicone Chemistry.pdf
Fascinating Silicone Chemistry.pdfShotosroyRoyTirtho
 
RISUN Brochure-T Serial for Construction Application
RISUN Brochure-T Serial for Construction ApplicationRISUN Brochure-T Serial for Construction Application
RISUN Brochure-T Serial for Construction ApplicationSean Koo
 
Polyurethane Mold Making & Casting Rubbers
Polyurethane Mold Making & Casting RubbersPolyurethane Mold Making & Casting Rubbers
Polyurethane Mold Making & Casting RubbersPolytek Development Corp
 
i8pdhciptr2yoknq05qn-signature-ae447a85cdf7452ab40b675cbe02036c11a196a1d74894...
i8pdhciptr2yoknq05qn-signature-ae447a85cdf7452ab40b675cbe02036c11a196a1d74894...i8pdhciptr2yoknq05qn-signature-ae447a85cdf7452ab40b675cbe02036c11a196a1d74894...
i8pdhciptr2yoknq05qn-signature-ae447a85cdf7452ab40b675cbe02036c11a196a1d74894...DavidPromiseMadukwe
 
Anti-corrosive coating to protect electrical assets
Anti-corrosive coating to protect electrical assetsAnti-corrosive coating to protect electrical assets
Anti-corrosive coating to protect electrical assetsImad Kanouni Moubtadi
 
27. rpd lab procedures
27. rpd lab procedures27. rpd lab procedures
27. rpd lab proceduresshammasm
 
Dow Corning Silicone Compounds
Dow Corning Silicone CompoundsDow Corning Silicone Compounds
Dow Corning Silicone CompoundsProject Sales Corp
 
Dow corning silicone compounds
Dow corning silicone compoundsDow corning silicone compounds
Dow corning silicone compoundsProject Sales Corp
 
Silicone Compounds from Project Sales Corp
Silicone Compounds from Project Sales CorpSilicone Compounds from Project Sales Corp
Silicone Compounds from Project Sales CorpProject Sales Corp
 

Similar to RTV silocone mould (20)

Rtv silicon
Rtv siliconRtv silicon
Rtv silicon
 
Centroid silicone/PTFE/Butyl
Centroid silicone/PTFE/ButylCentroid silicone/PTFE/Butyl
Centroid silicone/PTFE/Butyl
 
Momentive Silicone Conformal Coating Overview
Momentive Silicone Conformal Coating OverviewMomentive Silicone Conformal Coating Overview
Momentive Silicone Conformal Coating Overview
 
Rongxin Cataloge
Rongxin CatalogeRongxin Cataloge
Rongxin Cataloge
 
WTECH CONSTbrochure
WTECH CONSTbrochureWTECH CONSTbrochure
WTECH CONSTbrochure
 
Elastomeric impression materials
Elastomeric impression materialsElastomeric impression materials
Elastomeric impression materials
 
silicones
siliconessilicones
silicones
 
PVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdf
PVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdfPVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdf
PVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdf
 
PVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdf
PVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdfPVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdf
PVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdf
 
Fascinating Silicone Chemistry.pdf
Fascinating Silicone Chemistry.pdfFascinating Silicone Chemistry.pdf
Fascinating Silicone Chemistry.pdf
 
Elastomeric impression
Elastomeric impressionElastomeric impression
Elastomeric impression
 
RISUN Brochure-T Serial for Construction Application
RISUN Brochure-T Serial for Construction ApplicationRISUN Brochure-T Serial for Construction Application
RISUN Brochure-T Serial for Construction Application
 
Polyurethane Mold Making & Casting Rubbers
Polyurethane Mold Making & Casting RubbersPolyurethane Mold Making & Casting Rubbers
Polyurethane Mold Making & Casting Rubbers
 
i8pdhciptr2yoknq05qn-signature-ae447a85cdf7452ab40b675cbe02036c11a196a1d74894...
i8pdhciptr2yoknq05qn-signature-ae447a85cdf7452ab40b675cbe02036c11a196a1d74894...i8pdhciptr2yoknq05qn-signature-ae447a85cdf7452ab40b675cbe02036c11a196a1d74894...
i8pdhciptr2yoknq05qn-signature-ae447a85cdf7452ab40b675cbe02036c11a196a1d74894...
 
Anti-corrosive coating to protect electrical assets
Anti-corrosive coating to protect electrical assetsAnti-corrosive coating to protect electrical assets
Anti-corrosive coating to protect electrical assets
 
27. rpd lab procedures
27. rpd lab procedures27. rpd lab procedures
27. rpd lab procedures
 
Ingredients PVC
Ingredients PVCIngredients PVC
Ingredients PVC
 
Dow Corning Silicone Compounds
Dow Corning Silicone CompoundsDow Corning Silicone Compounds
Dow Corning Silicone Compounds
 
Dow corning silicone compounds
Dow corning silicone compoundsDow corning silicone compounds
Dow corning silicone compounds
 
Silicone Compounds from Project Sales Corp
Silicone Compounds from Project Sales CorpSilicone Compounds from Project Sales Corp
Silicone Compounds from Project Sales Corp
 

Recently uploaded

Python Programming for basic beginners.pptx
Python Programming for basic beginners.pptxPython Programming for basic beginners.pptx
Python Programming for basic beginners.pptxmohitesoham12
 
AntColonyOptimizationManetNetworkAODV.pptx
AntColonyOptimizationManetNetworkAODV.pptxAntColonyOptimizationManetNetworkAODV.pptx
AntColonyOptimizationManetNetworkAODV.pptxLina Kadam
 
Mine Environment II Lab_MI10448MI__________.pptx
Mine Environment II Lab_MI10448MI__________.pptxMine Environment II Lab_MI10448MI__________.pptx
Mine Environment II Lab_MI10448MI__________.pptxRomil Mishra
 
KCD Costa Rica 2024 - Nephio para parvulitos
KCD Costa Rica 2024 - Nephio para parvulitosKCD Costa Rica 2024 - Nephio para parvulitos
KCD Costa Rica 2024 - Nephio para parvulitosVictor Morales
 
Katarzyna Lipka-Sidor - BIM School Course
Katarzyna Lipka-Sidor - BIM School CourseKatarzyna Lipka-Sidor - BIM School Course
Katarzyna Lipka-Sidor - BIM School Coursebim.edu.pl
 
US Department of Education FAFSA Week of Action
US Department of Education FAFSA Week of ActionUS Department of Education FAFSA Week of Action
US Department of Education FAFSA Week of ActionMebane Rash
 
Theory of Machine Notes / Lecture Material .pdf
Theory of Machine Notes / Lecture Material .pdfTheory of Machine Notes / Lecture Material .pdf
Theory of Machine Notes / Lecture Material .pdfShreyas Pandit
 
CME 397 - SURFACE ENGINEERING - UNIT 1 FULL NOTES
CME 397 - SURFACE ENGINEERING - UNIT 1 FULL NOTESCME 397 - SURFACE ENGINEERING - UNIT 1 FULL NOTES
CME 397 - SURFACE ENGINEERING - UNIT 1 FULL NOTESkarthi keyan
 
Turn leadership mistakes into a better future.pptx
Turn leadership mistakes into a better future.pptxTurn leadership mistakes into a better future.pptx
Turn leadership mistakes into a better future.pptxStephen Sitton
 
Forming section troubleshooting checklist for improving wire life (1).ppt
Forming section troubleshooting checklist for improving wire life (1).pptForming section troubleshooting checklist for improving wire life (1).ppt
Forming section troubleshooting checklist for improving wire life (1).pptNoman khan
 
Curve setting (Basic Mine Surveying)_MI10412MI.pptx
Curve setting (Basic Mine Surveying)_MI10412MI.pptxCurve setting (Basic Mine Surveying)_MI10412MI.pptx
Curve setting (Basic Mine Surveying)_MI10412MI.pptxRomil Mishra
 
70 POWER PLANT IAE V2500 technical training
70 POWER PLANT IAE V2500 technical training70 POWER PLANT IAE V2500 technical training
70 POWER PLANT IAE V2500 technical trainingGladiatorsKasper
 
Module-1-(Building Acoustics) Noise Control (Unit-3). pdf
Module-1-(Building Acoustics) Noise Control (Unit-3). pdfModule-1-(Building Acoustics) Noise Control (Unit-3). pdf
Module-1-(Building Acoustics) Noise Control (Unit-3). pdfManish Kumar
 
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...Sumanth A
 
Analysis and Evaluation of Dal Lake Biomass for Conversion to Fuel/Green fert...
Analysis and Evaluation of Dal Lake Biomass for Conversion to Fuel/Green fert...Analysis and Evaluation of Dal Lake Biomass for Conversion to Fuel/Green fert...
Analysis and Evaluation of Dal Lake Biomass for Conversion to Fuel/Green fert...arifengg7
 
Immutable Image-Based Operating Systems - EW2024.pdf
Immutable Image-Based Operating Systems - EW2024.pdfImmutable Image-Based Operating Systems - EW2024.pdf
Immutable Image-Based Operating Systems - EW2024.pdfDrew Moseley
 
Robotics Group 10 (Control Schemes) cse.pdf
Robotics Group 10  (Control Schemes) cse.pdfRobotics Group 10  (Control Schemes) cse.pdf
Robotics Group 10 (Control Schemes) cse.pdfsahilsajad201
 
Virtual memory management in Operating System
Virtual memory management in Operating SystemVirtual memory management in Operating System
Virtual memory management in Operating SystemRashmi Bhat
 
ROBOETHICS-CCS345 ETHICS AND ARTIFICIAL INTELLIGENCE.ppt
ROBOETHICS-CCS345 ETHICS AND ARTIFICIAL INTELLIGENCE.pptROBOETHICS-CCS345 ETHICS AND ARTIFICIAL INTELLIGENCE.ppt
ROBOETHICS-CCS345 ETHICS AND ARTIFICIAL INTELLIGENCE.pptJohnWilliam111370
 

Recently uploaded (20)

Python Programming for basic beginners.pptx
Python Programming for basic beginners.pptxPython Programming for basic beginners.pptx
Python Programming for basic beginners.pptx
 
AntColonyOptimizationManetNetworkAODV.pptx
AntColonyOptimizationManetNetworkAODV.pptxAntColonyOptimizationManetNetworkAODV.pptx
AntColonyOptimizationManetNetworkAODV.pptx
 
Mine Environment II Lab_MI10448MI__________.pptx
Mine Environment II Lab_MI10448MI__________.pptxMine Environment II Lab_MI10448MI__________.pptx
Mine Environment II Lab_MI10448MI__________.pptx
 
KCD Costa Rica 2024 - Nephio para parvulitos
KCD Costa Rica 2024 - Nephio para parvulitosKCD Costa Rica 2024 - Nephio para parvulitos
KCD Costa Rica 2024 - Nephio para parvulitos
 
Katarzyna Lipka-Sidor - BIM School Course
Katarzyna Lipka-Sidor - BIM School CourseKatarzyna Lipka-Sidor - BIM School Course
Katarzyna Lipka-Sidor - BIM School Course
 
US Department of Education FAFSA Week of Action
US Department of Education FAFSA Week of ActionUS Department of Education FAFSA Week of Action
US Department of Education FAFSA Week of Action
 
Theory of Machine Notes / Lecture Material .pdf
Theory of Machine Notes / Lecture Material .pdfTheory of Machine Notes / Lecture Material .pdf
Theory of Machine Notes / Lecture Material .pdf
 
CME 397 - SURFACE ENGINEERING - UNIT 1 FULL NOTES
CME 397 - SURFACE ENGINEERING - UNIT 1 FULL NOTESCME 397 - SURFACE ENGINEERING - UNIT 1 FULL NOTES
CME 397 - SURFACE ENGINEERING - UNIT 1 FULL NOTES
 
Turn leadership mistakes into a better future.pptx
Turn leadership mistakes into a better future.pptxTurn leadership mistakes into a better future.pptx
Turn leadership mistakes into a better future.pptx
 
Forming section troubleshooting checklist for improving wire life (1).ppt
Forming section troubleshooting checklist for improving wire life (1).pptForming section troubleshooting checklist for improving wire life (1).ppt
Forming section troubleshooting checklist for improving wire life (1).ppt
 
Curve setting (Basic Mine Surveying)_MI10412MI.pptx
Curve setting (Basic Mine Surveying)_MI10412MI.pptxCurve setting (Basic Mine Surveying)_MI10412MI.pptx
Curve setting (Basic Mine Surveying)_MI10412MI.pptx
 
ASME-B31.4-2019-estandar para diseño de ductos
ASME-B31.4-2019-estandar para diseño de ductosASME-B31.4-2019-estandar para diseño de ductos
ASME-B31.4-2019-estandar para diseño de ductos
 
70 POWER PLANT IAE V2500 technical training
70 POWER PLANT IAE V2500 technical training70 POWER PLANT IAE V2500 technical training
70 POWER PLANT IAE V2500 technical training
 
Module-1-(Building Acoustics) Noise Control (Unit-3). pdf
Module-1-(Building Acoustics) Noise Control (Unit-3). pdfModule-1-(Building Acoustics) Noise Control (Unit-3). pdf
Module-1-(Building Acoustics) Noise Control (Unit-3). pdf
 
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...
 
Analysis and Evaluation of Dal Lake Biomass for Conversion to Fuel/Green fert...
Analysis and Evaluation of Dal Lake Biomass for Conversion to Fuel/Green fert...Analysis and Evaluation of Dal Lake Biomass for Conversion to Fuel/Green fert...
Analysis and Evaluation of Dal Lake Biomass for Conversion to Fuel/Green fert...
 
Immutable Image-Based Operating Systems - EW2024.pdf
Immutable Image-Based Operating Systems - EW2024.pdfImmutable Image-Based Operating Systems - EW2024.pdf
Immutable Image-Based Operating Systems - EW2024.pdf
 
Robotics Group 10 (Control Schemes) cse.pdf
Robotics Group 10  (Control Schemes) cse.pdfRobotics Group 10  (Control Schemes) cse.pdf
Robotics Group 10 (Control Schemes) cse.pdf
 
Virtual memory management in Operating System
Virtual memory management in Operating SystemVirtual memory management in Operating System
Virtual memory management in Operating System
 
ROBOETHICS-CCS345 ETHICS AND ARTIFICIAL INTELLIGENCE.ppt
ROBOETHICS-CCS345 ETHICS AND ARTIFICIAL INTELLIGENCE.pptROBOETHICS-CCS345 ETHICS AND ARTIFICIAL INTELLIGENCE.ppt
ROBOETHICS-CCS345 ETHICS AND ARTIFICIAL INTELLIGENCE.ppt
 

RTV silocone mould

  • 3. Contents Introduction basic terms RTV Silicone RTV-1 RTV-2 Steps used in RTV SILICONE mould making Advantages Disadvantages Application 3
  • 4. Intoduction ◈ Silicone rubber is an excellent moulding material used mainly where minute surface detail is required usually in conjunction with deep undercuts. There is virtually no shrinkage and is recommended where a larger number of casts are required. ◈ As there are many types of silicone rubber available this information has been designed to give a general introduction to its use. ◈ Details such as cure time and percentage of curing agent to add will be stated on the containers. 4
  • 5. Basics terms What is casting ? Casting is a manufacturing process in which a liquid material is usually poured into a mold, which contains a hollow cavity of the desired shape, and then allowed to solidify. ... Casting is most often used for making complex shapes that would be otherwise difficult or uneconomical to make by other methods. What is mould ? Mold making is a vital process in which a material is used for making themold of the original model. Different materials can be used for mold making process depending on each one's needs and preference. The common material used for mold making process is the rubber. 5
  • 6. Basics………. What is pattern making ? In casting, a pattern is a replica of the object to be cast, used to prepare the cavity into which molten material will be poured during the casting process . Patterns used in sand casting may be made of wood, metal, plastics or other materials ◈ Pattern 6
  • 7. RTV SILICONE 7 RTV silicone is a liquid silicone compound that cures at room temperature to form a flexible rubber. This can be either an Adhesive Sealant, Moulding Rubber or Electronic Encapsulate Potting Compound. The term RTV is means Room Temperature Vulcanising. Room-temperature vulcanizing (RTV) silicone =reactive oil-based polymers + strengthening mineral fillers There are two types of room-temperature vulcanizing silicone…
  • 8. RTV-1 (ONE COMPONENT SYSTEM) RTV-2 (TWO COMPONENT SYSTEM) Hardens due to the action of atmospheric humidity, a catalyst, and acetoxysilane . Acetoxysilane+Humidity=acetic. The curing process begins on the outer surface and progresses through to its core. The product is packed in airtight cartridges and is either in a fluid or paste form. RTV-1 silicone has good adhesion, elasticity, and durability characteristics. ◈ Two-component products that, when mixed, cure at room temperature to a solid elastomer, a gel, or a flexible foam. ◈ RTV-2 remains flexible from −80 to 250 °C (−112 to 482 °F). ◈ Break-down occurs at temperatures above 350 °C (662 °F), leaving an inert silica deposit that is non-flammable and non-combustible 8
  • 9. RTV-2 9 ◈ RTV-2 is used to make flexible moulds, as well as many technical parts for industry and paramedical applications. ◈ They can be used for electrical insulation due to their dielectric properties.
  • 10. Steps used in RTV SILICONE mould making ◈ SIMPLE OPEN MOULD 10
  • 11. Steps used in RTV SILICONE mould making 11
  • 12. 12
  • 13. CARES TO BE TAKEN ◈ the mould box should then be coated with a fine layer of petroleum jelly. ◈ Allow to stand for approximately 10 minutes before pouring the bulk, hold the container as low as possible and pour in a thin stream. ◈ Mix the silicone rubber and if a vacuum is not available paint over the surface of the master pattern with a thin coat. ◈ Leave to cure for 24 hours before removing the mould. 13
  • 14. Two Part Mould ◈ A part mould (split mould) is necessary where it is difficult to remove either the master or the castings from an open mould. ◈ STEPS….. ◈ Pattern to be to be made with help of rapid prototyping system techniques. 14
  • 16. 16
  • 17. Advantages and ◈ RTV silicone rubber has excellent release properties compared to molds rubbers, which is especially an advantage when doing production casting of resins (polyurethane, polyester, and epoxy). ◈ No release agent is required, obviating post-production clean up. ◈ Silicones also exhibit good chemical resistance and high- temperature resistance (205 °C, 400 °F and higher). ◈ For this reason, silicone molds are suitable for casting low- melt metals and alloys (e.g. zinc, tin, pewter, and Wood's metal) 17
  • 18. Disadvantages ◈ RTV silicone rubbers are, however, generally expensive—especially platinum-cure. ◈ They are also sensitive to substances (sulfur- containing modelling clay such as Plastilina ) that may prevent the silicone from curing . ◈ Silicones are usually very thick (high viscosity), and must be vacuum degassed prior to pouring, to minimize bubble entrapment. 18
  • 19. References ◈ Jorge Cervantes, Ramón Zárraga, Carmen Salazar-Hernández "Organotin catalysts in organosilicon chemistry" Appl. Organometal. Chem. 2012, vol. 26, 157–163. doi:10.1002/aoc.2832 ◈ ^ Jump up to:a b Hans-Heinrich Moretto, Manfred Schulze, Gebhard Wagner (2005) "Silicones" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim. doi:10.1002/14356007.a24_057 ◈ ^ "picsima-ii". picsima-ii. Retrieved 2017-01-05. 19