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Identification & Functionality
- Chemical Family
- Polymer Name
- Composite Materials Functions
- Technologies
Features & Benefits
- Materials Features
- Chemical resistance
Performance figures for fully cured Crystic® 272 laminates, in more than 200 chemical environments, are shown in Technical Leaflet No. 145 "Safe Chemical Containment".
Applications & Uses
- Applications
- Composites End Use
- Composites Processing Methods
- Formulation Guidelines
Crystic® 272 can be used in hot, heat-assisted and cold curing formulations by using the following recommended catalyst systems.
- Benox® C50 for hot curing
- Benox® C50 and Norox® CHP for heat-assisted curing.
- Andonox® KP9, or
- Norox® MEKP-925H for cold curing.
Properties
- Color
- Physical Form
- Appearance
- Clear, yellowish liquid
- Typical Liquid Resin Properties
- Resin Properties - Unfilled Casting (Cured)
- Note
* Curing Schedule - 24 hrs at 20ºC, 3 hrs at 80ºC
† Curing schedule - 24hrs @ 20ºC, 5hrs @ 80ºC, 3hrs @120ºC
| Value | Units | Test Method / Conditions | |
| Viscosity (at 25°C, 37.35 s⁻¹) | 360 | Centipoise | — |
| Density (at 25°C) | 1.1 | g/cm³ | — |
| Volatile Content | 41 | % | — |
| Acid Value | 18 | mg KOH/g | — |
| Stability (with storage recommendations) | 9 | Months | — |
| Gel Time (at 25°C, using 2% Andonox® KP9 and 2% Crystic® Accelerator E) | 12 | Minutes | — |
| Value | Units | Test Method / Conditions | |
| Barcol Hardness (Model GYZ 934-1)* | 43 | — | — |
| Deflection Temperature (under load 1.80 MPa) †* | 66 | ºC | — |
| Water Absorption (7 days, at 23°C)* | 55 | mg | — |
| Tensile Strength* | 79 | MPa | — |
| Tensile Modulus* | 3400 | MPa | — |
| Elongation (at break)* | min. 3.6 | % | — |
Technical Details & Test Data
- Hot Curing
Benox® C50 should be added at 2% and thoroughly dispersed in the resin. The catalyzed mix will remain usable for approximately 5 days at workshop temperature (18ºC-25ºC). Cure will take place between 80ºC and 140ºC, but for most applications, 120ºC will be satisfactory. Approximate geltimes are shown in the Table 1, which should be used as a guide only, not as a specification.
Table 1: Approximate hot curing geltimes for Crystic® 272.
Temperature Setting Time in Minutes 80ºC 8 100ºC 4 120ºC 2 - Heat-Assisted Curing
Benox® C50 and Norox® CHP should be added at 1% and thoroughly dispersed in the resin. Shortly before use, the correct amount (1% - 4%) of Crystic® Accelerator E should be stirred into the resin. This mix will remain usable at workshop temperature (18ºC - 25ºC) for 6 to 24 hours. Gelation will take place at 60ºC and above, making this formulation particularly suitable for winding and drawing applications, which require a long pot life.
- Cold Curing
Andonox® KP9 should be added at 2% into the resin. For taint free laminates, to be used with foodstuffs, 2% Norox® MEKP-925H should be used. The catalyst must be thoroughly dispersed in the resin, and this mix will remain usable for approximately 8 hours at workshop temperature (18ºC-20ºC). Shortly before use, the correct amount (1%-4%) of Crystic® Accelerator E should be stirred into the catalyzed resin.
- Additives
Crystic® 272 may be pigmented by the addition of up to 5% Crystic® Pigment Paste. The addition of certain pigments, fillers or extra styrene may adversely affect the food taint, toxicity and chemical resistant properties of Crystic® 272. Users should therefore satisfy themselves that any additions made would give the performance required.
- Post Curing
Satisfactory laminates for many applications can be made with Crystic® 272 by curing at workshop temperature (25ºC). However, for optimum chemical, water and heat resistant properties, heat-assisted and cold cured laminates must be post cured before being put into service. Moldings should be allowed to cure for 24 hours at 25ºC and then be oven cured for 3 hours at 80ºC. Post curing is not normally necessary for hot cured laminates provided that the molding cycle is adequate. Moldings that are to be used with foodstuffs should be allowed to cure for 24 hours at 25ºC and then be oven cured for a minimum of 3 hours at 85ºC. 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 (60ºC - 80ºC) 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® 272 is supplied in 25kg, 225kg drums, and 1125kg intermediate bulk containers. Bulk supplies can be delivered by road tanker.
Storage & Handling
- Storage
- Crystic® 272 should be stored between 5°C and 25°C in the original, unopened container in a dry well ventilated place. Protect from freezing and direct sunlight. Avoid contact with oxidizing agents. If stored outside of these recommendations, shelf life will be significantly reduced.