Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Polymer Name
- Composite Materials Functions
- Technologies
Features & Benefits
- Materials Features
- Features and Benefits
Crystic 491PA has 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.
- Chemical Resistance
Performance figures for fully cured Crystic 491PA laminates, in more than 200 chemical environments, are shown in technical Leaflet No. 145 “Safe Chemical Containment”.
Applications & Uses
- Applications
- Plastics & Elastomers End Uses
- Composites Processing Methods
- Applications
- Crystic 491PA were developed for use in a wide range of critical applications which require toughness combined with water and chemical resistance. They are versatile resins suitable for the fabrication of high performance boat hulls destined for use in warm or tropical areas, and form a matched performance system when used with Crystic Gelcoat 65PA. They are also suitable for the manufacture of chemical plant, tanks, pipes and chemical containers.
- Crystic 491PA can be brush or spray applied, and may also be used in the pultrusion process.
- Formulation Guidelines
Both resins should be allowed to attain workshop temperature (18°C - 20°C) before use. Crystic 491PA needs only the addition of catalyst to start the curing reaction. For general moldings, the recommended catalyst is Catalyst M (or Butanox M50) but for applications involving foodstuffs and potable liquids, the recommended catalyst is Catalyst O (or Interox LA3). The catalyst should be added at 2% into the resin and thoroughly dispersed shortly before use.
Crystic 491 requires the addition of a catalyst and an accelerator to start the curing reaction. For general moldings the recommended catalyst is Catalyst M (or Butanox M50) but for applications involving foodstuffs and potable liquids, the recommended catalyst is Catalyst O (or Interox LA3). The catalyst should be added at 2% into the resin and thoroughly dispersed. Shortly before use the correct amount of Accelerator E should be stirred into the catalyzed resin.
N.B Catalyst and accelerator must not be mixed directly together since they can react with explosive violence.
The gel times of Crystic 492 and 491PA can be approximately determined from the tables below-Pot Life
Crystic 491PA Parts of catalyst to 100 parts resin 2% Catalyst M 2% Catalyst O Pot life in minutes at 15°C 27 56 Pot life in minutes at 20°C 18 28 Pot life in minutes at 25°C 12 18 The resins, mold and workshop should all be at, or above, 15°C before curing is carried out.
Properties
- Color
- 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
** C.S.M** Laminate 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 s⁻¹) | 6.5 | Poise | BS 2782 |
| Viscosity (at 25°C, 4500 s⁻¹) | 3.3 | Poise | BS 2782 |
| Specific Gravity (at 25°C) | 1.11 | — | BS 2782 |
| Volatile Content | 42 | % | BS 2782 |
| Acid Value | 18 | mg KOH/g | BS 2782 |
| Gel Time (at 25°C, using 2% Catalyst M (or Butanox M50)) | 12 | Minutes | BS 2782 |
| Value | Units | Test Method / Conditions | |
| Glass Content | 32 | % | BS 2782 |
| Tensile Strength | 121 | MPa | BS 2782 |
| Tensile Modulus | 7600 | MPa | BS 2782 |
| Elongation (at break) | 2.2 | % | BS 2782 |
| Flexural Strength | 218 | MPa | BS 2782 |
| Flexural Modulus | 7200 | MPa | BS 2782 |
| Value | Units | Test Method / Conditions | |
| Barcol Hardness (Model GYZ 934-1)* | 43 | — | BS 2782 |
| Deflection Temperature (under load 1.80 MPa) †* | 77 | ºC | BS 2782 |
| Water Absorption (24h, at 23°C)* | 17 | mg | BS 2782 |
| Tensile Strength* | 77 | MPa | BS 2782 |
| Tensile Modulus* | 3500 | MPa | BS 2782 |
| Elongation (at break)* | 4 | % | BS 2782 |
| Specific Gravity (at 25°C)* | 1.2 | — | BS 2782 |
Regulatory & Compliance
- 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.
Technical Details & Test Data
- Additives
Crystic 491PA may be pigmented by the addition of up to 5% of Crystic Pigment Paste. The addition of certain pigments, fillers or extra styrene may adversely affect the food taint, toxicity and chemical resistant properties of laminates so, for critical applications, customers should satisfy themselves that any additions made will give the performance required.
- 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.
- 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.
Packaging & Availability
- Country Availability
- Packaging Type
- Regional Availability
- Packaging
- Crystic® 491 and 491PA are supplied in 25kg and 200kg containers.
Storage & Handling
- Storage Conditions
Crystic 491 and 491PA 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.