Notcutt - Polyurethane Rubber Moulding Compounds

$Poly Latex 60$

Polyurethane Rubber Moulding Compounds

Polytek POLY 74 SERIES - RTV LIQUID RUBBERS
DESCRIPTION: Poly 74-Series Rubbers consist of liquid part A and Part B which after mixing cure at room temperature to flexible, high strength RTV mould rubbers. Poly 74-Series Rubbers make durable, easy releasing moulds for casting gypsum plasters and waxes without release agents, but are also excellent for casting cement, epoxy, polyester, urethane and acrylic with correct release agents.

These products are safe to use if directions are followed. Part A is a clear liquid with a viscosity of 5000 cps and specific gravity of 1.02 g/cc. Part Bs have specific gravities of 1.00 g/cc. Poly 74-65B is blue-black, Poly 74-55B is yellow, Poly74-40B and 74-30B are blue/grey-amber translucent and 74-29B is black.. All Bs except 74-65B and 74-55B require stirring before use. Part B often darkens with age, but the rubber properties do not change.

PHYSICAL PROPERTIES	POLY 74-55	POLY 74-65	POLY 74-40	POLY 74-30	New Clear POLY 74-30	New Tough POLY 74-29
Mix Ratio by Weight	4A to 1B	4A to 1B	2A to 1B	1A to 1B	1A to 1B	1A to 1B
Shore A Hardness	65	55	40	30	30	30
Pot Life (Pour Time)	10 minutes	15 minutes	20 minutes	30 minutes	30 minutes	60 minutes
Colour	Clear Blue	Clear Yellow	Translucent Blue/Grey-Amber	Translucent Blue/Grey-Amber	Clear Amber	Black
Mixed Initial Viscosity	4000 cps	4000 cps	3400 cps	2000 cps	2000 cps	2800 cps
Specific Volume - cu in/lb	27.5	27.5	27.5	27.5	27.5	27.5
Shrinkage during cure	Nil	Nil	Nil	Nil	Nil	Nil

MODEL PREPARATION: Porous models such as wood or plaster must be sealed (Ambersil DP100 Wax Release Agent can be used for this) then coated with a release agent like Pol-Ease 2300 ( or Ambersil Polyurethane Release Agent). Lacquer, paint, PVA, and potters soap on damp plaster work well as sealers. If Shellac is used as the sealer, it must be thoroughly coated with release agent as Poly 74 Series rubbers bond tenaciously to Shellac. The sealed or non-porous model should then be coated with Pol-Ease 2300 release agent which should be allowed to dry. In every case where there is any question about the compatibility between the rubber and the prepared model surface, a test cure should be made on an identical surface. Porous models must be vented from beneath to prevent trapped air from forming bubbles in the rubber.

MIXING AND CURING: Parts A and B are clear liquids with Poly 74-65 and 74-55 and the new clear Poly 74-30. Part B's of other Poly rubbers are opaque and require stirring or shaking before use. Unopened containers are useable at least one year from date of shipment. Both parts A and B tend to absorb atmospheric moisture, thus should be used up as soon as possible after the container is opened. Part A should be weighed into a clean metal, glass or plastic container, then the appropriate amount of Part B can be weighed into the same container. While mixing, avoid whipping air into the mix. A baker's rubber bowl scraper (a Poly Paddle) makes an excellent mixing paddle. While mixing scrape down the sides and bottom of the mixing container several times to ensure thorough mixing of both components. Aerosil can be added to the mixed liquids to thicken the rubber to a gel for application by brush or trowel. See details of the Polygel Mould Making Method in "Technical Tips".

Vacuum degassing will help to provide bubble-free moulds but is usually not necessary. Allow to cure at room temperature 77 degrees F (25 C). Ultimate properties are reached in about seven days but moulds may be used with care after 48 hours curing. Curing in a warm location, up to l40 degrees F (60 C) will greatly accelerate the curing speed while low temperatures slow the cure. Avoid curing in areas where the temperature is below 60 degrees F (15 C).

PART C FOR SOFTER MOULDS: Poly 74 Part C Softener can be added to the above products to soften the cured rubber and lower the viscosity of the mix. There will be a loss of strength, slower cure and increased tendency to shrink after repeated castings when Part C is used. To soften Poly 74-4- to Shore A-30 hardness, add 50 parts Part C to 150 parts total mix of A and B by weight. to soften Poly 74-40 Shore A-20, add 150 parts Part C to 150 parts of mixed A and B by wieight. Amounts required to soften different products will vary and should be determined by conducting your own tests.

USING THE MOULD: Usually no release agent is necessary when casting plaster or molten wax in Poly moulds. Sponging, dipping or spraying the mould with 1% detergent solution in water and pouring plaster on the wet mould reduces air bubbles in the plaster and aids release. Pol-Ease 2300 (Ambersil Polyurethane Release Agent) is an excellent release agent for most resins. Water-based form releases are preferred for concrete. Mineral oil based release agents should not be used. Exposure to solvent type form releases should be kept to a minimum. Poly 74 Series moulds will last many years if stored undistorted on a flat surface in a cool, dry location out of direct sunlight.

WARNING: Uncured Poly compounds may cause skin or respiratory irritation or sensitization if improperly handled. Avoid skin and eye contact with the uncured material. If skin contact occurs, remove with waterless hand cleaner or alcohol then soap and water. In case of eye contamination, flood with water and call physician. Use only with adequate ventilation. If there is any doubt about adequacy of ventilation, a mask with air purifying cartridge for organic vapours should be worn when using Part A. Poly elatomers are not to be used where food or prolonged body contact may occur. Read MSDS and container labels prior to use.

DISCLAIMER: The information contained in this bulletin is considered accurate. However, no warranty is expressed or implied regarding the accuracy of the data, the results to be obtained by the use thereof, or that any such use will not infringe any patent. Before using, user shall determine the suitability of the product for the intended use and user assumes all risk and liability whatsoever in connection therewith.

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Polytek POLY 50-50 - RTV LIQUID RUBBERS
DESCRIPTION: Poly 50-50 rubber consists of liquid Part A and Part B which, after mixing, cures at room temperature to a flexible, high strength RTV mould rubber. Poly 50-50 rubber make durable, easy releasing moulds for casting gypsum plasters and waxes without release agents, but is also excellent for casting cement, epoxy, polyester and polyurethane with proper release agents.

Poly 50-50 is safe to use if directions are followed. Part A is a clear liquid with a viscosity of 5,000 cps. and specific gravity of 1.05 g/cc. Part B has a specific gravity of 0.98 g/cc. Poly 50-50 Part B is green to brown. Part B often darkens with age, but rubber properties do not change. Part A and B for Poly 50-50 require no stirring before use.

PHYSICAL PROPERTIES

	Poly 50-50

Mix ratio, by weight	1A to 1B
Hardness, Shore A	50
Pour Time	20 min
Colour	Green
Viscosity, mixed	1,550 cps
Cu. inches/pound	27.5
Shrinkage during cure	Nil

MODEL PREPARATION: Porous models such as plaster or wood should be sealed, preferably with wax or several coats of nitrocellulose lacquer, but petroleum jelly, paint, PVA (soap or plaster) and other coatings work well. If shellac is used as the sealer, it must be thoroughly coated with release agent as Poly rubbers bond tenaciously to shellac. The sealed or non-porous model should then be coated with Ambersil Polyurethane Release Agent or wax which should be allowed to dry. In every case where there is any question about the compatibility between the rubber and the prepared model surface, a test cure should be made on an identical surface to determine the complete curing and good release is obtained. Porous models must be vented from beneath to prevent trapped air from forming bubbles in the rubber.

MIXING AND CURING: Unopened containers are usable at least one year from date of shipment. Both parts A and B tend to absorb atmospheric moisture, thus should be used up as soon as possible after the container is opened. Part A should be weighed into a clean metal. glass or plastic container, then the appropriate amount of Part B can be weighed into the same container. While mixing, avoid whipping air into the mix. A baker's rubber bowl scraper (a Poly Paddle) makes an excellent mixing paddle. While mixing, scrape down the sides and bottom of the mixing container several times to insure thorough mixing of both components. Cab-O-Sil or similar can be added to the mixed liquids to thicken the rubber to a gel for application by brush or trowel.

Vacuum degassing will help to provide bubble-free moulds, but is usually not necessary. Allow to cure at room temperature 77°F (25°C). Ultimate properties are reached in about seven days, but moulds may be used with care after 48 hours curing. Curing in a warm location, up to 140°F (60°C) will greatly accelerate the curing speed while low temperatures slow the cure. Avoid curing in areas where the temperature is below 60°F (15°C).

USING THE MOULD: No release agent is necessary when casting gypsum or molten wax in Poly moulds. Sponging, dipping or spraying the mould with 1% detergent solution prior to pouring plaster reduces surface air bubbles in the plaster and aids release. After the first few castings, plaster release becomes even easier. Ambersil Polyurethane Release Agent is an excellent release agent for most resins. Poly moulds will last many years if stored undistorted on a flat surface in a cool, dry location out of direct sunlight.

WARNING: Uncured Poly compounds may cause skin or respiratory irritation or sensitization if improperly handled. Avoid skin and eye contact with the uncured material. If skin contact occurs, remove with waterless hand cleaner or alcohol then soap and water. In case of eye contamination, flood with water and call a doctor. Use only with adequate ventilation. If there is any doubt about adequacy of ventilation, a mask with air purifying cartridges for organic vapours should be worn when using Part A. Poly elastomers are not to be used where food or prolonged body contact may occur. Read MSDS and container labels prior to use.

DISCLAIMER: The information contained in this bulletin is considered accurate. However, no warranty is expressed or implied regarding the accuracy for the data, the results to be obtained by the use thereof, or that any such use will not infringe any patent. Before using, the user shall determine the suitability of the product for the intended use and the user assumes all risk and liability whatsoever in connection therewith.

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Polytek POLY 75 Series - RTV LIQUID RUBBERS

DESCRIPTION: Poly 75 Series rubbers consist of liquid Part A and Part B which after mixing, cure at room temperature to economical flexible mould rubbers. These products may be considered for casting plasters, cement and waxes. Resins may also be cast with proper release agents. The Poly 75 Series has been formulated for good economy with high performance.

PHYSICAL PROPERTIES	POLY 75-45	POLY 75-59	POLY 75-60	POLY 75-75	POLY 75-80
Mix ratio by weight	1A to 2B	1A to 1B	1A to 1B	2A to 1B	2A to 1B
Shore A hardness	45	60	60	75	80
Pot Life (Pour Time)	30 minutes	10 minutes	10 minutes	20 minutes	45 minutes
Colour	Amber	Amber	Amber	Amber	Yellow/Amber
Viscosity mixed	925 cps	2,500 cps.	1,200 cps	4,000 cps	5,000 cps
Cubic inches/pounds	26	27	27	26	26

MODEL PREPARATION: Porous models such as wood or plaster must be sealed (Ambersil DP100 Wax Release Agent can be used for this) then coated with a release like Pol-Ease 2300 (or Ambersil Polyurethane Release Agent). Lacquer, paint, PVA, and potters soap on damp plaster work well as sealers. If shellac is used as the sealer, it must be thoroughly coated with release agent as Poly 75 Series rubbers bond tenaciously to Shellac. The sealed or non-porous model should then be coated with Pol-Ease 2300 release agent which should be allowed to dry. In every case where there is any question about the compatibility between the rubber and the prepared model surface, a test cure should be made on an identical surface. Porous models must be vented from beneath to prevent trapped air from forming bubbles in the rubber.

MIXING AND CURING: Both Parts A and B tend to absorb atmospheric moisture which spoils the material, so containers should be used up as soon as possible after opening. Part A should be weighed into a clean metal or plastic container, then the appropriate amount of Part B may be weighed into the same container. Mix thoroughly. We recommend hand mixing with a Poly Paddle to avoid mixing air into the rubber. While mixing, scrape the sides and bottom several times to ensure thorough mixing of both components. Pour the rubber as soon as it is thoroughly mixed to obtain best flow and air bubble release. Ultimate properties are reached in about seven days but moulds may be used with care after 48 hours curing. Curing in a warm location accelerates the cure while low temperatures retard the cure. Avoid curing in areas where the temperature is below 60 degrees F. Tools may be cleaned with denatured alcohol before the rubber cures.

USING THE MOULD: Usually no release agent is necessary when casting plaster or molten wax in Poly moulds. Sponging, dipping or spraying the mould with 1% detergent solution in water and pouring plaster on the wet mould reduces air bubbles in the plaster and aids release. Pol-Ease 2300 (Ambersil Polyurethane Release Agent) is an excellent release agent for most resins. Water-based form releases are preferred for concrete. Mineral oil based release agents should not be used. Exposure to solvent type form releases should be kept to a minimum. Poly 75 Series moulds will last many years if stored undistorted on a flat surface in a cool, dry location out of direct sunlight.

Supplied By: W.P. Notcutt Limited, 25 Church Road, Teddington, Middlesex, TW11 8PF, England Tel: 0181 977 2252

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Polytek POLY - FAST 72 - 40 - RTV LIQUID RUBBERS

POLY-FAST 72-40 RTV LIQUID RUBBER
ADD POLY-FAST 72X TO DEMOULD IN 10 MINUTES

FEATURES:

Low viscosity	Pour or brush-on	Non-staining	Odour free
Colour mix indicator	Economical	Low toxicity	Long work time
Variable hardness	Good flow and bubble release		Rapid cure

DESCRIPTION: Poly-Fast 72-40 rubber consists of liquid Part A and Part B which, after mixing in correct ratio, cures at room temperature to a versatile mould rubber. It may be poured or thickened and applied by trowel or brush, to make high quality, flexible moulds. These moulds are especially useful for making was or plaster casts and with release agents are good for casting resins and concrete as well.

PHYSICAL PROPERTIES	Poly-Fast 72-40
Mix ratio, by weight	1A to 10B
Hardness, Shore A	40
Pour time	30 min
Colour	Ivory (Brown A, White B)
Viscosity, mixed	4,000 cps
Cubic inches/pound	20
Shrinkage during cure	Nil

MODEL PREPARATION: Poly-Fast 72-40 rubber may be subject to cure inhibition by certain surface contaminants and may stick to some surfaces. In every case where there is any question about the compatibility between the rubber and the prepared surface, a test cure should be made on an identical surface to see that satisfactory results are obtained. Porous models such as wood, plaster, stone, pottery or masonry must be scaled then coated with a release agent like Pol-Ease 2300. Multiple coats of paste wax dried and buffed will seal most surfaces. Potters soap is an excellent sealer for plaster. Fresh shellac is a good sealer because other sealers such as lacquer and paints may be softened by Pol-Fast 72-40 rubber. Shellac coated surfaces must always be coated with a release agent over the shellac as Poly-Fast 72-40 bonds tenaciously to shellac. Uncoated shellac may be used as a primer to cause Poly-Fast 72-40 to bond to certain surfaces, such as plaster. Porous models must be vented from beneath to prevent trapped air from forming bubbles in the rubber. Non-porous surfaces and models sealed as above should be coated with a release agent such as Pol-Ease 230-0. this includes surfaces such as metals, Plasticine (except Roma Plastalina), wax, ceramics, fibreglass and cured Poly rubbers. Some plastics such as styrene and coatings such as lacquer may be softened by Poly-Fast 72-40 and must be coated with a barrier such as Poly PVA Solution.

MIXING AND CURING: Both Parts A and B tend to absorb atmospheric moisture, thus should be used as soon as possible after opening the container. All materials should be at room temperature. Stir individual components before use. The mixing ratio of ten parts of A to one hundred parts of B by weight is important. An error of 5% in the weight of either components can effect the physical properties of the cured rubber and an error of 15% can result in a soft, poorly cured compound. Part B should be weighed into a clean metal, glass or plastic, container, then the appropriate amount of Part A can be weighed on top of the B. Units are preweighed and the Part A can simply be emptied into the Part B container, if the whole unit is to be used at once. While mixing, scrape down the sides oft eh mixing container several times to insure thorough mixing of both components. Vacuum degassing or pressure curing will help to provide bubble free moulds but is usually not necessary. Allow to cure 8 hours at room temperature, 77⁰F (25⁰C), before demoulding. Ultimate properties are reached in 3 days. Curing in a warm location, up to 150⁰F (65⁰C), will greatly accelerate the curing speed while low temperature slow down the cure. Avoid curing in areas where the temperature is below 60⁰F (15⁰C).

FASTER CURE: Poly-Fast Part X Accelerator can be added to make the rubber cure in 10 minutes or less. Part X should be stirred into the Part B before adding Part A. Use 0.8 parts X per 100 parts B for a 10 minute cure. 0.5 parts of X for a one hour cure.

FLOW CONTROL: Cab-O-Sil M-5 can be added to produce varying viscosities in the mixed uncured rubber. Consistencies can range from that of a thin latex paint to a grease-like putty which can be buttered onto a vertical surface. Up to 4 parts Cab-O-Sil can be added to 100 parts mixed Poly-Fast 72-40. No extra A is required when Cab-O-Sil is used as the thickener. A liquid thickener Part D is also available for use with Poly-Fast 72-40. If using Part D one part D added to 100 parts B results in light cream consistency and two parts D results in a grease-like consistency. Part D must be stirred into Part B thoroughly before Part A is added. One extra part of A must be added for each part of D that is used. Use a Part D required careful weighing and care, as it is corrosive.

MOULD RELEASE: Mould release agents are usually not necessary for wax or gypsum casts in Poly-Fast 72-40 moulds. When casting epoxy, urethane and polyester resins, a release agent must be used and with some resins a barrier coat, like Poly PVA Solution (top coated with a release agent), may be necessary. Portland cement castings will erode the rubber slightly with each casting, sometimes leaving a white haze on the cement. Some mould releases or barrier coats may reduce mould erosion and whitening of cement castings. repeated contact of the rubber with solvents and oils should be kept to a minimum as these materials will cause mould swelling or shrinkage. Spray application of release is best as it reduces contact with solvents.

COLOURS: Poly-Fast 72-40 can be tinted to pastel shades by adding small amounts of colours as recommended in our Manual & Catalogue.

SOFTER MOULDS: A liquid softener, Poly-Fast Part C, can be added to create rubbers as soft as Shore A-6. Part C should be weighed and thoroughly mixed with the proper amount of Poly-Fast 72-40 Part B prior to combining with Part A. Each 20 parts of Part C added to 100 parts total A and B will lower the hardness approximately 10 to 15 Shore A points.

STORAGE: Poly-Fast 72-4- will remain usable for at least six months from the date of shipment in unopened containers, stored in a cool, dry location. Cured moulds will slowly soften with age. Adequate mixing of components in the proper mix ratio contributes to long mould life as will storage of moulds in a dark, cool, dry area. With proper care, Poly-Fast 72-40 moulds should not soften appreciably for 2-4 years. moulds should be discarded before they become too soft to handle. Do not store moulds outdoors, as exposure to sunlight and standing water or ground moisture will cause rapid deterioration of the rubber.

WARNING: Uncured Poly compounds may cause skin or respiratory irritation or sensitization if improperly handled. Avoid skin and eye contact with the uncured material. If skin contact occurs, remove with waterless hand cleaner or alcohol then soap and water. In case of eye contamination, flood with water and call physician. Use only with adequate ventilation. F there is any doubt about adequacy of ventilation, a mask with air purifying cartridges for organic vapours should be worn when using Part A. Poly elastomers are not to be used where food or prolonged body contact may occur. read MSDS and container labels prior to use.

DISCLAIMER: The information contained in this bulletin is considered accurate. however, no warranty is expressed or implied regarding the accuracy of the data, the results to be obtained by the use thereof, or that any such use will not infringe any patent. Before using, user shall determine the suitability of the product for the intended use and user assumers all risk and liability whatsoever in connection therewith.

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