Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Polymer Name
- Composite Materials Functions
- Technologies
- Product Families
Features & Benefits
- Labeling Claims
- Materials Features
- Features and Benefits
Crystic® Polyester Resin 491 have a low level of residual styrene which enables the production of non-toxic, non-tainting laminated. This makes then especially suitable for the manufacture of vessels to contain food and potable liquids including drinking water, milk wines and spirits.
Applications & Uses
- Applications
- Composites End Use
- Composites Processing Methods
- Formulation Guidelines
- Satisfactory laminates for many applications can be made from Crystic 491 and 491PA by curing at workshop temperature (20°C). For optimum properties and long term performance, however, laminates should be post cured before being put into service. The laminate should be allowed to cure for 24 hours at 20°C, and then be oven cured for 3 hours at 80°C, or 16 hours at 40°C.
- Moldings which are to be used with foodstuffs should be allowed to cure for 24 hours at 20°C and then be over cured for a minimum of 3 hours at 85°C. They should be thoroughly wet – steam cleaned for at least one hour prior to use.
- If wet steam cleaning is not practical, suitably shaped moldings can be filled with hot water (60°C - 80°C) containing non-perfumed detergent. After 2 hours, they should be emptied and thoroughly rinsed with several batches of clean, hot water. These precautions are essential to avoid the tainting of foodstuffs.
- Post Curing
- Satisfactory laminates for many applications can be made from Crystic 491 and 491PA by curing at workshop temperature (20°C). For optimum properties and long term performance, however, laminates should be post cured before being put into service. The laminate should be allowed to cure for 24 hours at 20°C, and then be oven cured for 3 hours at 80°C, or 16 hours at 40°C.
- Mouldings which are to be used with foodstuffs should be allowed to cure for 24 hours at 20°C and then be over cured for a minimum of 3 hours at 85°C. They should be thoroughly wet – steam cleaned for at least one hour prior to use.
- If wet steam cleaning is not practical, suitably shaped mouldings can be filled with hot water (60°C - 80°C) containing non-perfumed detergent. After 2 hours, they should be emptied and thoroughly rinsed with several batches of clean, hot water. These precautions are essential to avoid the tainting of foodstuffs.
Properties
- Appearance
- Cloudy
- Typical Liquid Resin Properties
- Laminate properties
- Resin Properties - Unfilled Casting (Cured)
- Note
* Curing schedule - 24hrs at 20°C, 3 hrs at 80°C
† Curing schedule - 24hrs at 20°C, 5hrs at 80°C, 3hrs at 120°C** Made with 4 layers 450g/m² PB CSM; Curing schedule - 24hrs at 20°C, 16hrs at 40°C
| Value | Units | Test Method / Conditions | |
| Viscosity (at 25°C, 37.35 sec⁻¹) | 5 | poise | — |
| Viscosity (at 25°C, 4500 sec⁻¹) | 4 | poise | — |
| Specific Gravity (at 25°C) | 1.11 | — | — |
| Volatile Content | 40 | % | — |
| Acid Value | 18 | mg KOH/g | — |
| Gel Time (at 25°C, using 2% Catalyst M and 4% Accelerator E) | 9 | min | — |
| Value | Units | Test Method / Conditions | |
| Glass Content** | 32 | % | — |
| Tensile Strength** | 121 | MPa | — |
| Tensile Modulus** | 7600 | MPa | — |
| Elongation at Break** | 2.1 | % | — |
| Flexural Strength** | 214 | MPa | — |
| Flexural Modulus** | 7300 | MPa | — |
| Value | Units | Test Method / Conditions | |
| Barcol Hardness (Model GYZJ 934-1)* | 45 | — | — |
| Deflection Temperature under Load (1.80 MPa) † | 75 | ºC | — |
| Water Absorption (24 h, at 23°C)* | 19 | mg | — |
| Tensile Strength* | 75 | MPa | — |
| Tensile Modulus* | 3500 | MPa | — |
| Elongation at Break* | 3.8 | % | — |
| Specific Gravity (at 25°C)* | 1.2 | — | — |
Regulatory & Compliance
- Quality Standards
- Approvals
- Crystic 491PA is approved by Lloyd's Register of Shipping for use in the construction of craft under their survey.
- In conjunction with Crystic Gelcoat 65PA, Crystic 491PA is approved under the Water Regulations Advisory Scheme (WRAS) for use in contact with potable water.
Packaging & Availability
- Packaging Type
- Packaging Information
Crystic 491are supplied in 25kg and 200kg containers.
Storage & Handling
- Storage Conditions
Crystic 491 should be stored in the dark in suitable containers. It is recommended that the storage temperature should be less that 20°C where practical, but should not exceed 30. Ideally, containers should be opened only immediately prior to use.