RAJNA compound range · toughened injection moulding material
RAJNA-i2122 toughened, crystallisable PLA compound
A medium-viscosity compound developed for injection-moulded household and technical products, with modified mechanical behaviour and the option of promoting crystallisation during processing.
Key characteristics of RAJNA-i2122
RAJNA-i2122 is a medium-viscosity, toughened, PLA-based compound for injection moulding. Its heat deflection behaviour depends on the crystallinity generated during processing: rapid cooling produces a more amorphous structure, while an elevated mould temperature can promote partial crystallisation.
Important: the stated values are processing guidance and product-description figures. Actual mechanical and thermal performance depends on drying, machine configuration, mould design, part geometry, cycle time and crystallinity. Production trials and measurement-based validation are required before serial manufacture.
What does “toughened compound” mean?
Toughening is intended to reduce the brittle fracture tendency of a PLA-based material and make the finished product less sensitive to mechanical loading. Exact impact, tensile or elongation values must always be evaluated using the current technical data sheet and tests performed on relevant specimens or finished parts.
Reduced brittle behaviour
Suitable for evaluation where the brittleness of an unmodified PLA grade would limit the intended application.
Household applications
The product description refers to partially crystallised household products designed for heat resistance above 90 °C, subject to validation on the actual product.
Custom moulded products
Components where medium viscosity, modified toughness and controllable crystallisation provide a useful combination.
The role of crystallisation in heat performance
Mould temperature and cycle time have a major influence on the structure generated during processing. Rapid cooling produces a more amorphous material, while an elevated mould temperature can produce a partially crystallised and more opaque article.
Processing relationships
- Rapid cooling: more amorphous structure and lower heat resistance.
- Amorphous condition: stated heat resistance of approximately 58 °C.
- 100–120 °C mould: increased opportunity for crystallisation.
- Partial crystallisation: more opaque appearance and potentially higher heat deflection performance.
- Typical target: household products with heat resistance above 90 °C.
Processing and drying guidance
RAJNA-i2122 can be processed on many conventional injection moulding machines. As with other PLA-based materials, moisture control and melt residence time require particular attention.
| Processing technology | Injection moulding on conventional equipment. |
|---|---|
| Machine-selection principle | The machine should support the shortest practical residence time in the barrel. |
| Mould temperature | The current product description states an elevated mould temperature of 100–120 °C for promoting partial crystallisation. |
| Recommended moisture content | Below 0.008%, equivalent to 80 ppm, to reduce the risk of viscosity degradation during processing. |
| Condition at delivery | The product description states delivery in a foil-lined box or bag at a moisture content below 400 ppm. |
| Drying | Inline drying is recommended. Material in an amorphous condition should be dried below 50 °C. |
| Material handling | After drying, the material should be protected from renewed exposure to ambient humidity. |
Barrel-zone temperatures, injection pressure, holding pressure, speed, cycle time and cooling must be established for the specific machine, mould and part geometry. Production trials and measurement validation are required before serial manufacture.
Application and validation approach
The description “toughened” does not replace technical verification of the finished article. Required testing should be selected according to the actual load case, service temperature and product geometry.
Mechanical testing
Tensile, flexural, impact or finished-product functional testing should be selected according to the expected type of loading.
Heat-performance testing
Heat deflection performance should be checked on the actual processed material at the relevant crystallinity level.
Process validation
Mould filling, shrinkage, warpage, cycle time and crystallinity uniformity should be assessed during the production trial.
Frequently asked questions about RAJNA-i2122
How does RAJNA-i2122 differ from conventional PLA?
It is a toughened injection moulding compound developed to reduce brittle behaviour and support applications where partial crystallisation is required.
Is heat resistance above 90 °C guaranteed?
Not automatically. The product description refers to partially crystallised household products above 90 °C, but the actual value must be verified on the specific product using the relevant test method.
Why is the recommended moisture level so low?
The current technical guidance recommends less than 80 ppm to reduce hydrolytic degradation and loss of melt viscosity during processing.
Can it be processed on a conventional injection moulding machine?
According to the current product description, yes, provided that the material is dried correctly and melt residence time is kept as short as practicable.
Which products should be evaluated first?
Household or technical products where conventional PLA brittleness is limiting and higher heat deflection performance is required through controlled crystallisation.
Do you need RAJNA-i2122 trial material or technical support?
Send Tibor Sipos the intended part geometry, wall thickness, mechanical load, service temperature and estimated annual volume. Based on this information, Friend Plastic can assess suitability and define the required production-trial and validation programme.