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EPOXY LAMINATING SYSTEMS
FOR THE VARTM PROCESS Vacuum-Assist Resin-Transfer Method (VARTM) is the procedure of infusing a resin matrix into plies of dry fabric, under vacuum, to make composite laminates. In this process, dry plies of fabric are laminated onto a hard mold surface along with release plies, flow media, vacuum lines, and resin distribution lines, with the entire laminate placed under a vacuum bag. Infusion resin/hardeners are batch-mixed and sucked into the laminate, by vacuum, through resin distribution lines. VARTM-type resin systems are identified by very low mixed viscosities and longer working times.
Resin infusion for tooling has a number of advantages over using prepreg tooling materials: much lower material costs; easier ply positioning; less chance of delamination; no autoclave required; room-temperature demold; free-standing post cure; no refrigerated storage and long shelf life.
Resin infusion for production parts offers the same advantages as for tooling. This process in usually reserved for large structures such as boats or composite car bodies and others. To Download PTM&W Material Safety Data Sheets (MSDS), click here | RESIN INFUSION FOR PARTS | | PT2712 is a low viscosity epoxy system designed for the fabrication of parts and structures by the resin infusion method. This system flows extremely well, and produces dense, void-free laminates routinely. The cured properties of this system are very high, so it produces items with good strength and toughness with excellent long-term stability. Four hardeners are available for use with this resin, which provide a range of working times. The hardeners have gel times of approximately 40 minutes,1 hour, 2 hours and 3 hours, so, by proper selection between the four, it is possible to easily infuse any size structure. The four hardeners are identical except for reaction time, so no matter which hardener is chosen, the user can expect the same high performance properties. The mixed viscosity with all four hardeners is just over 300 centipoise, so the material flows very well, even in thin walled areas. It penetrates heavy fabric sections and wets out quickly for further ease of production. | | | PT2712 A / B *1 | Mix Ratio, | By Weight
| j | By Volume
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| 100 : 22 By Weight
( All Four Hardeners) | 4 to 1 By Volume
( All Four Hardeners ) |
| | Pot Life, @ 77oF | Part B - 70 miuntes; Part B1 - 122 minutes
Part B2 - 175 minutes; Part B3 - 40 minutes | | Color | Light Amber | | Mixed Viscosity, centipoise | 320 cps. | | Cured Hardness, Shore D | 86 Shore D | | Tensile Strength, psi Laminate *2 | 41,415 psi | | Elongation, % at Break Laminate *2 | 2.54% | | Tensile modulus, psi Laminate *2 | 2,792,062 psi | | Flexural Strength, psi Laminate *2 | 54,683 psi | | Flexural Modulus, psi Laminate *2 | 2,876,867 psi | | Compressive Strength, psi | 15,930 psi | | Compressive Modulus, psi | 491,503 psi | Izod Impact Strength, ft-lbs / in of Notch,
Method A - Notched | 1.093 | | Glass Transition Temperature, DMA | Tg: Onset ( E' ) | | | Peak |
| | Thermal Coefficient of Expansion,
Range:40oC to 60oC | 5.42 x 10-5 in./in. oF |
*1:The 4 Hardeners for PT2712 are Functionally Identical Except for Reaction Time, so Cured Properties are The Same for All.
*2:Tensile and Flexural Properties were Determined with a 1/8 inch Laminate Style 7500 Boat & Tooling Fiberglass Cloth, Resin Content of 40%.
| RESIN INFUSION FOR TOOLING | | PT5714 is a low viscosity epoxy resin system that has found good acceptance for use in vacuum infusion fabrication and tooling processes. The low mixed viscosity of this system allows it to penetrate the reinforcing materials easily and completely, producing a void-free, dense composite structure.
PT5714 has very good hot strength, so cured parts or tooling fabricated with it can provide good service in elevated temperature operating conditions. | | | PT5714 A / B | | Color | Black *
| | Mixed Viscosity, | @ 77oF | | | @ 90oF |
| 575 centipoise | 400 centipoise |
| | Cured Hardness, Shore D | 84 Shore D | | Specific Gravity, grams / cc | 1.105 | | Tensile Strength, psi** | Laminate - 10 oz. (7500) Fabric | | | Laminate - 8 oz. (181) Fabric |
| | | Elongation at Yield, %** | Laminate - 10 oz. (7500) Fabric | | | Laminate - 8 oz. (181) Fabric |
| | | Tensile Modulus, psi** | Laminate - 10 oz. (7500) Fabric | | | Laminate - 8 oz. (181) Fabric |
| 3,988,675 psi | 3,197,430 psi |
| | Flexural Strength, psi** | Laminate - 10 oz. (7500) Fabric | | | Laminate - 8 oz. (181) Fabric |
| | | Flexural Modulus, psi** | Laminate - 10 oz. (7500)Fabric | | | Laminate - 8 oz. (181) Fabric |
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2,612,766 psi
| 3,345,683 psi |
| | Compressive Strength, psi | 15,007 psi | | Compressive Modulus, psi | 384,653 psi | | Izod Impact Strength, Meth. A - Notched, ft.lbs./in of Notch | 1.7 | | Glass Transition Temperature, Tg, DMA | Tg:
Onset (E' ) | | | Tg Peak |
| | | Thermal Coefficient of Expansion | 3.755 x 10-5 in./in./oF |
* A non-pigmented version of this system is available by special order. The product number is PT5712 A/B
** Note: Tensile and Flexural Properties were Determined with .125" Laminates Made by Resin Infusion Process with Style 7500, 10 oz. Tooling Cloth and Style 181, 8 oz. Industrial Fabric.
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