PROVISIONAL DATA SHEET GRIVORY HT
GRIVORY XE 3876 BLACK 9697
Product description
Grivory XE 3876 black 9697 is a 30% glass-fibre reinforced flame retardant (UL 94 V-0) engineering thermoplastic material based on a semi-crystalline, partially aromatic copoly-amide.
Grivory XE 3876 black 9697 is halogen free and free of red phosphorous.
RoHS: Grivory XE 3876 black 9697 is in compliance with RoHS (2002/95/EC, Restric-tion of Hazardous Substances)
WEEE: Parts produced from Grivory XE 3876 black 9697 are not subject to \"selective treatment\" according the Directive 2002/96/EC on Waste Electrical and Elec-tronic Equipment.
ISO-Polymer designation: PA 6T/66
ASTM-Designation: PPA, Polyphthalamid
The main distinguishing feature of Grivory HT, when compared to other polyamides, is its good performance at high temperatures providing parts which are stiffer, stronger and have better heat distortion stability and chemical resistance.
Grivory XE 3876 black 9697 is especially suitable for injection moulded parts in elec-tro,- and electronic applications with high requirements and a material flame class acc. UL 94 V-0.
PROPERTIES
Mechanical Properties
Tensile E-Modulus Tensile strength at break Elongation at break Impact strength Impact strength Notched impact strength Notched impact strength Ball indentation hardness
1 mm/min 5 mm/min 5 mm/min
Standard ISO 527 ISO 527 ISO 527
Unit MPa MPa %
State dry cond. dry cond. dry cond. dry cond. dry cond. dry cond. dry cond. dry cond.
Charpy, 23°C ISO 179/2-1eU kJ/m2 Charpy, -30°C ISO 179/2-1eU kJ/m2 Charpy, 23°C ISO 179/2-1eA kJ/m2 Charpy, -30°C ISO 179/2-1eA kJ/m2
ISO 2039-1
MPa
Grivory XE 3876
black 9697
11’000 11’000 135 130 2 2 30 30 30 30 8 8 7 7 240 230
Thermal Properties Melting point
Heat deflection temperature HDT/A Heat deflection temperature HDT/C Thermal expansion coefficient long. Maximum usage temperature Maximum usage temperature
DSC 1.80 MPa 8.00 MPa 23-55°C long term short term
ISO 11357 ISO 75 ISO 75 ISO 11359 ISO 11359 ISO 2578 ISO 2578
°C °C °C 10-4/K 10/K °C °C
-4
dry dry dry dry dry dry dry
310 280 200 0.25 0.45 120-140
240
Thermal expansion coefficient trans. 23-55°C
Electrical Properties Dielectric strength
Comparative tracking index Specific volume resistivity Specific surface resistivity
CTI
IEC 60243-1 IEC 60112 IEC 60093 IEC 60093
kV/mm - Ω · m Ω
dry cond. cond. dry cond. cond. 34 34 600 1010 1010 1011
General Properties Density
Flammability (UL94)
Glow wire temperature (1mm, 2mm) Water absorption Moisture absorption Linear mould shrinkage Linear mould shrinkage
Product-nomenclature acc. ISO 1874: PA 6T/66, MHF, 11-120, GF30
0.4 - 3.2 mm IEC GWFI IEC GWIT 23°C/sat. long. trans.
ISO 1183 ISO 1210
g/cm
3
dry - - - - dry dry
1.43 V0 960 775 3.5 1.3 0.1 0.9
rating
IEC 60695-2-12 °C IEC 60695-2-13 °C ISO 62 ISO 294 ISO 294
% % % %
23°C/50% r.h. ISO 62
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Processing information for the injection moulding of Grivory XE 3876 black 9697
This technical data sheet for Grivory XE 3876 black 9697 provides you with useful information on mate-rial preparation, machine requirements, tooling and processing.
Drying temperature
Temperatures above 80°C for desiccant dryers and temperatures above 100°C for vacuum ovens should be avoided.
At longer residence times (over 1 hour) hopper heating or a hopper dryer (80°C) is useful.
MATERIAL PREPARATION
Grivory XE 3876 black 9697 is delivered dry and ready for processing in sealed, air tight packaging. Pre-drying is not necessary.
Use of regrind
Grivory XE 3876 black 9697 is a thermoplastic ma-terial. Hence, incomplete mouldings as well as sprues and runners can be reprocessed. The fol-lowing points should be observed:
Storage
Sealed, undamaged bags can be kept over a long period of time in storage facilities which are dry, protected from the influence of weather and where the bags can be protected from damage.
• • • • • •
Handling and safety
Detailed information can be obtained from the “Ma-terial Safety Data Sheet” (MSDS) which can be requested with every material order.
Moisture absorption
Grinding: Dust particles and particle size distri-bution
Contamination through foreign material, dust, oil, etc.
Quantity addition to original material Colour variation
Reduction of mechanical properties
Drying
During its manufacturing process Grivory XE 3876 black 9697 is dried and packed with a moisture content of ≤ 0.10 %. Should the packaging become damaged or the material is left open too long, then the material must be dried. A too high moisture content can be shown by a foaming melt and silver streaks on the moulded part.
The drying can be done as follows: Desiccant dryer
Temperature: max. 80°C Time: 4 - 12 hours Dew point of the dryer: -40°C
Vacuum oven
Temperature: max. 100 °C Time: 4 - 12 hours
When adding regrind, special care has to be taken by the moulder. For the production of parts of Grivory XE 3876 the proportion of regrind should not exceed 25 weight percent.
MACHINE REQUIREMENTS
Grivory XE 3876 black 9697 can be processed economically and problem-free on all machines suitable for polyamides.
Screw
Wear protected, universal screws with shut-off nozzles are recommended (3 zones).
Screw
Length: 18 D - 22 D Compression ratio: 2 - 2.5
Shot volume
The metering stroke must be longer than the length of the back flow valve (without decompression distance).
Selecting the injection unit
Shot volume = 0.5 - 0.8 x (max. shot volume)
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Drying time
If there is only little evidence of foaming of the melt or just slight silver streaks on the part, then the above mentioned minimal drying time will be suffi-cient. Material, which is stored open over days shows strong foaming, unusually easy flowing, streaks and rough surface on the moulded part. Then the maximal drying time is required.
! Silver streaks can also be caused by overheating of the material (over 350°C) or by too long melt residence time in the barrel.
Heating
At least three separately controllable heating zones, able of reaching cylinder temperatures up to 350°C are required. A separate nozzle heating is necessary. The cylinder flange temperature must be controllable (cooling).
Gate and runner
To achieve an optimal mould-fill and to avoid sink marks, a central gate at the thickest section of the moulding is recommended. Pin point gate (direct) or tunnel gates are more economical and more com-mon with technical moulding.
To avoid premature solidification of the melt and difficult mould filing, the following points should be considered: Gate diameter
0.8 x thickest wall section of the injection
moulding part
Runner diameter
1.4 x thickest wall section of the injection moulding part (but minimum 4 mm)
Nozzle
Open nozzles are simple, allow an easy melt flow and are long lasting. There is however the danger that during retraction of the screw after injection, air maybe drawn into the barrel (decompression). For this reason, needle shut-off nozzles are often used.
Clamping force
As a rule of thumb the clamping force can be esti-mated using the following formula:
Clamping force 1) 7.5 kN x projected area (cm2) 1) in cavity pressure of 750 bar
VENTING
In order to prevent burning marks and improve weldline strength, proper venting of the mould cav-ity should be provided (venting channels on the parting surface dimensions: Depth 0.02 mm, width 2 - 5 mm).
TOOLING
The design of the mould tool should follow the general rules for glass fibre reinforced thermoplas-tics.
For the mould cavities common mould tool steel quality (e.g. hardened steel) which has been hard-ened to level of 56 - 65 HRC is necessary. We recommend additional wear protection in areas of high flow rates in the tool (e.g. pin point gates, hot runner nozzles).
PROCESSING
Mould filling, post pressure and dosing
The best surface finish and a high weld line strength is achieved with a high injection speed and when a sufficiently long post pressure is employed.
Demoulding / Draft angle
Parts moulded from Grivory HT solidifies very quickly showing excellent dimensional stability. Asymmetric demoulding and undercuts are to be avoided. It is favourable to foresee high numbers of large ejector pins or a stripper plate. Demoulding draft angles between 1 to 5° are acceptable. Fol-lowing values can be considered:
(VDI 3400) 12 Depth of roughness (µm) 0.4 Demoulding angle (%) 1
15
0.6 1 33 4.5 2
18 0.8 1.1 36 6.3 2.5
21 1.1 1.2 39 9 3
24 1.6 1.3 42 13 4
27 2.2 1.5 45 18 5
The injection speed should be regulated so as to reduce towards the end of the filling cycle in order to avoid burning. For dosing at low screw revolu-tions and pressure the cooling time should be fully utilised.
Basic machine settings
In order to start up the machines for processing Grivory XE 3876 black 9697, following basic set-tings can be recommended: Temperatures
Flange 80 - 100°C Zone 1 300 - 320°C Zone 2 300 - 325°C Zone 3 300 - 325°C Nozzle 300 - 320°C Tool 60 - 140°C Melt 310°C
Pressures / Speeds
Injection speed medium - high Hold-on pressure (spec.) 500 - 750 bar Dynamic pressure (hydr.) 5 - 15 bar
-1
Screw speed 50 - 100 min
(VDI 3400) 30
Depth of roughness (µm) 3.2 Demoulding angle (%) 1.8
4
Start up and purging
Foreign materials in the cylinder should be removed with suitable purging materials. Hot-runner systems should be purged likewise. Glass fibre reinforced polyamide 66 is a suitable “bridging material”.
Cylinder heating should start with a clean, product-free screw, starting from the temperature level of the “bridging material” of 300°C up to the required temperature level of 310-320°C (see processing data).
After at least three full dosings (free-shot) the start up procedure can be implemented.
After completion of production with Grivory HT the screw, cylinder and melt distribution system should be cleaned out thoroughly.
CUSTOMER SERVICES
EMS-GRIVORY is a specialist for polyamide syn-thesis and polyamide-processing. Our customer services are not only concerned with the manufac-turing and supply of engineering thermoplastics but also provide a full of technical support program:
• Rheological design calculation / FEA • Prototype tooling • Material selection • Processing support
• Mould and component design
We are happy to advice you. Simply call one of our sales offices.
Conditioning
The dimensions and the mechanical properties of Grivory HT products are only marginally influenced by moisture absorption. For testing purposes, parts can be stored in a climatic chamber until an in-crease in weight of 1 % has been achieved. In order to avoid stress through swelling, conditioning in hot water is to be avoided.
The recommendations and data given are based on our experience to date, however, no liability can be assumed in connection with their usage and processing.
Generated / updated: HAR / 03.2004
This version replaces all previous product specific data sheets
www.emsgrivory.com
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