Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Polymer Name
- Composite Materials Functions
- Technologies
Features & Benefits
- Materials Features
Applications & Uses
- Markets
- Composites Processing Methods
- Recommended Applications
Crystic® 491PAT was developed for use in a wide range of critical applications which require toughness combined with water and chemical resistance. Crystic® 491PAT is thixotropic and can be applied by either brush or spray equipment and may also be used in the pultrusion process for the production of profile sections. Crystic® 491PAT is suitable for the fabrication of high performance boat hulls destined for use in warm and tropical waters.
- Formulation Guidelines
Crystic® 491PAT should be allowed to attain workshop temperature (18ºC - 20ºC) before use. Stir well by hand, or with a low shear mixer to avoid aeration, and then allow to stand to regain thixotropy. Crystic® 491PAT requires only the addition of a catalyst to start the curing reaction. The recommended catalyst is Norox® KP9, which should be added at 2% into the resin. Norox® KP-925 H will increase the pot life. The catalyst should be thoroughly incorporated into the resin, with a low shear mechanical stirrer where possible. Crystic® 491PAT is formulated for room temperature curing applications. It requires only addition of the correct amount of catalyst to start the curing reaction. The recommended formulations are given in Table 1:
Table 1
Component Parts by weight Crystic® 491PAT 100 Catalyst Norox® KP9 or Norox® KP-925 H 1.0-3.0 N.B. Peroxide catalysts are highly reactive and may decompose with explosive violence, or cause fires, if they come into contact with flammable materials, metals or accelerators. For this reason they must never be stored in metal containers or be mixed directly with accelerators
The catalyst must be stirred thoroughly into the resin shortly before use. Curing should not be carried out at temperatures below 15ºC. Scott Bader (Pty) Ltd. will not be liable for problems caused by use at lower temperatures than recommended. The resin must be allowed to attain workshop temperature (15-30ºC) before being formulated for use.
Properties
- Color
- Typical Liquid Resin Properties
- Resin Properties - Unfilled Casting (Cured)
- Note
*Curing schedule - 24hrs @ 20ºC, 3hrs @ 80ºC
†Curing schedule - 24hrs @ 20ºC, 5hrs @ 80ºC, 3hrs @120ºC
| Value | Units | Test Method / Conditions | |
| Viscosity (at 25°C, Brookfield RVT, 100 rpm) | 485 | Centipoise | BS 2782 |
| Thixotropic Index | 2 | Ratio | BS 2782 |
| Specific Gravity (at 25°C) | 1.06 | — | BS 2782 |
| Acid Value | 17.5 | mg KOH/g | BS 2782 |
| Volatile Content | 43 | % | BS 2782 |
| Stability (in dark at 20°C) | 3 | Months | BS 2782 |
| Gel Time (at 25°C, using 1% Andonox® KP9 catalyst) | 25 | Minutes | BS 2782 |
| Value | Units | Test Method / Conditions | |
| Barcol Hardness (GYZJ 934-1)* | 45 | — | BS 2782 |
| Deflection Temperature (under load 1.80 MPa) †* | 79 | ºC | BS 2782 |
| Water Absorption (24h, at 23°C)* | 21 | mg | BS 2782 |
| Volumetric Shrinkage* | 7.5 | % | BS 2782 |
| Tensile Strength* | 77 | MPa | BS 2782 |
| Tensile Modulus* | 3400 | MPa | BS 2782 |
| Elongation (at break)* | 4.5 | % | BS 2782 |
Technical Details & Test Data
- Post Curing
Satisfactory laminates for many applications can be made from Crystic® 491PAT by curing at workshop temperature (20°C). However, in order to develop optimum strength and chemical resistance, laminates made with this resins should be post cured. After release from the mold, laminates should be allowed to mature for 24 hours at workshop temperature (20°C). They should then be post cured for a minimum of three hours at 80°C, or 15 hours at 50°C. When laminates are required to withstand temperatures between 50 and 80°C in service, the post curing temperature should always be at least as high as that at which the laminate is required to operate. The post cure is most effective if it is carried out immediately after the 24 hour maturing period.
- Additives
Crystic® 491PAT can be pigmented with up to 5% Crystic® Pigment Paste. Since the addition of certain pigments may affect the food taint, toxicity and chemical resistant properties of laminates; users should seek advice from our Technical Service Department before making any additions.
Packaging & Availability
- Packaging Type
- Packaging
- Crystic® 491PAT is supplied in 25kg, 225kg drums, and 1000kg flowbins. Bulk supplies can be delivered by road tanker.
Storage & Handling
- Storage
- Crystic® 491PAT should be stored in the dark in suitable, closed containers. It is recommended that the storage temperature should be less than 20°C where practical, but should not exceed 30°C. Ideally, containers should be opened only immediately prior to use. Where they have to be stored outside, it is recommended that drums be kept in a horizontal position to avoid the possible ingress of water. Wherever possible, containers should be stored under cover.
- Pot Life
The temperature and the amount of Norox® KP9 catalyst or Norox® KP-925 H catalyst control the gel time of the resin formulation and can be approximately determined from Table 2.
Table 2: Effects of varying temperature on the pot life of Crystic® 491PAT
Norox® KP9 Catalyst Addition Rate Temperature ºC Gel time in minutes 2% 15°C 29 2% 20°C 20 2% 25°C 14 The resin, mold and workshop should all be at, or above, 15ºC before curing is carried out. Scott Bader (Pty) Ltd. will not be liable for problems caused by use at lower temperatures than recommended.