Technical Information Leaflet

Transcription

1 IMAGECURE XV501T-4 Hole Plug PRODUCT REFERENCE Resist Clear CAWN2020 Hardener Green CAWN2021 CONTENTS 1. Description 2. Mixing 3. Thinning 4. Pre-clean 5. Application 6. Washing Up 7. Curtain Coating 8. Post bake 9. Storage and Shipping 10. Health and Safety 11. Packaging 12. Film Performance / Technical Specification 13. Disclaimer 14. Support ISO9001 SM840C Class H ISO14001 Bellcore RoHS & WEEE Directive Compliant UK and Corporate Headquarters Norton Hill, Midsomer Norton Bath, BA3 4RT, England Telephone: (44) Fax: (44)

2 1) DESCRIPTION is a screen-printed resist used to fill via holes during printed circuit board manufacture. It is printed into the holes then topcoat is applied immediately onto the wet ink. This Technical Information Leaflet (TIL) and the appropriate Material Safety Data Sheet (MSDS) should be read carefully before using the product. 2) MIXING The resist and hardener components must be mixed together in the correct mixing ratio of 1:1 w/w before use. The hardener component must be added to the resist component. It is recommended that attention be paid to ensuring that any resist at the sides of the container and on the bottom is completely mixed into the main body of the resist. After the mixing operation is completed it is recommended to allow the mixed and thinned pack to debubble for ~ 30 min. before use. Mixed pot life at 23º± 2ºC (70-77ºF) will be approximately 72 hours. Always ensure the lid is replaced on the container to avoid any contamination and excessive solvent evaporation. 3) THINNING Once mixed, the resist is ready for use and should be printed un-thinned where possible to ensure good hole plugging (fill). However, should thinning be required to obtain a more suitable printing viscosity, a maximum of 2% Imagecure Slow Thinner XZ107 should be used. Note that over-thinning can lead to some of the via-holes being unplugged, partially plugged, or smeared around the hole edge. N.B. The mixed resist should be stirred well before use. T217/3 Page 2 of 7 May 2006

3 4) PRE-CLEAN Ensure that all copper surfaces are completely clean, tarnish free and dry prior to applying Imagecure. Mechanical pre-cleaning is recommended as follows: - Brushing grit silicon carbide brushes are recommended having a footprint on the copper of 8-15mm. ( in). The water rinse and heater sections should be capable of thoroughly rinsing and drying the panels such that no water is left in the holes or between closely spaced conductors and that moisture or tarnish is not present on the freshly brushed panels. It is important that each brush is regularly checked and dressed as necessary to ensure optimum efficiency during use. Please note that Nylon brushes of grit can also be used. Pumice Pumice or Aluminium oxide slurry of between 12-18% is recommended with an optimum of 15%. The water rinse and heater sections must be capable of rinsing and drying the panels such that residual pumice particles are completely removed and that no water is left in the holes or between closely spaced conductors and that moisture or tarnish is not present on the freshly cleaned panels. For panels that are badly oxidised and tarnished then a micro-etch prior to mechanical pre-cleaning is recommended. The micro-etch should be capable of removing any oxide or tarnish staining and of thoroughly rinsing and drying the panel before being mechanically cleaned. Panels which have close track/gap configurations (<100µm./4mil.), may not be suitable for mechanical precleaning and will need to be micro-etched. The use of either a standard micro-etch or the deep etching micro etch chemistries can be effective in this process. It is recommended that each user ensures that the Imagecure product is compatible with the particular micro-etch used and all subsequent metal finishing processes. Surface roughness figures of :- Ra µm. R delta q 4-9º would be considered to be optimum values for copper surfaces pre-cleaned as above. A minimum Ra of 0.2µm. with an R delta q value of >4º is recommended (optimum R delta q values 7-9º). Please refer to separate technical document on surface roughness for a fuller explanation of the above roughness values. Inspect to ensure no moisture is left in the holes after pre-cleaning, as this will have a detrimental affect on holeplugging success. If moisture is present, pre-dry panels at C for 30 mins. NOTE. It is recommended that all freshly cleaned panels are coated with Imagecure XV501T-4 within a maximum time of 2-4 hours. The actual maximum time will vary depending upon ambient temperature and humidity. Panels left longer than 4 hours before coating should be pre-cleaned again. T217/3 Page 3 of 7 May 2006

4 5) APPLICATION The resist is normally applied before the application of solder mask by means of a horizontal screen unit. It is essential to ensure good registration, otherwise smearing and poor hole-fill will occur. Printing conditions will be dependant on size of holes, typically mm, and the thickness of boards being plugged. The hole diameter in the screen or stencil should be larger than the diameter of the hole to be plugged, the amount of oversize depending on the registration capability of the printer. The following conditions are guidelines: - General: Squeegee hardness Shore Squeegee angle for good hole fill Hole diameter oversize ~ mm. Metal stencil: Stencil thickness μm. Snap off 0-7mm. Polyester screen: Mesh T/cm. Emulsion thickness 10-30μm. Snap Off 2-7mm. The ink is usually printed on the component side of the board. A support should be placed under the board separate from the holes so that ink can penetrate to the reverse side without smudging. A single flood and print stroke should be sufficient to plug the holes. A dome of ink should be visible on the print and the reverse side and the amount of fill should be constant across the board. Underfill may give solder balls and overfill may give excessive ink height. Once plugged, the boards should be curtain coated immediately, in-line, wet-on-wet, without drying/curing of the hole-plug. All screens must be cleaned and thoroughly dried before use and free from residues of screen cleaner and ink. 6) WASHING UP Screen Cleaner XZ46 is recommended for washing up. Alternative cleaners and screenwashes are available to suit customers particular requirements. Your local Sun Chemical Circuits representative will be pleased to advise on product selection. 7) CURTAIN COATING Please see the relevant TIL for the curtain coat product to be used. All processing steps up to final cure should be in accordance with the curtain coat TIL. T217/3 Page 4 of 7 May 2006

5 8) POST BAKE A ramped post-bake is essential to ensure gradual removal of any residual solvent so that voids and blisters do not occur during the final cure cycle. Temperatures/times will be dependant on the type of oven, panel design, and metallisation process used. As a guideline, the following conditions have been used successfully: - 80 C for 30minutes 100 C for 20minutes 120 C for 10minutes 150 C for 60minutes Longer curing cycles may be required depending on the ovens being used and on the types of boards and hole sizes being filled. 9) STORAGE AND SHIPPING When stored in sealed containers, in a cool place (20ºC / 68ºF), away from sources of direct heat and sunlight, Imagecure XV501T-4 resist and hardener components have a shelf life of 18 months. Imagecure XV501T-4 can withstand higher temperatures (40-60ºC / ºF), whilst in transit for up to periods of 1 month without any detrimental effect on its performance. 10) HEALTH AND SAFETY Detailed material safety data sheets will be supplied by your local Sun Chemical Circuits representative. The products detailed hereon have been tested in accordance with, and meet the requirements of, the RoHS Directive 2002/96/EC and the European Directive 2003/11/EC, regarding the presence of the metals - Pb (Lead / Lead compounds), Hexavalent Chromium, Cd (Cadmium), Hg (Mercury), and Poly Brominated Flame Retardants. The materials detailed above are present below the specified maximum limits. 11) PACKAGING Imagecure XV501T-4 Clear Hole Plug Resist 0.50 kg. CAWN2020 Imagecure XV501T-4 Green Hole Plug Hardener 0.50 kg. CAWN2021 Imagecure XZ107 Slow Thinner 5.00 L. CDSN4059 Imagecure XZ46 Screen Cleaner 5.00 L. CDSN4008 T217/3 Page 5 of 7 May 2006

6 12) FILM PERFORMANCE / TECHNICAL SPECIFICATION PHYSICAL PROPERTIES OF IMAGECURE XV501T-4 SCREEN Pack Code Viscosity (PaS)* S.G. Flash point Non volatile content CAWN >70 C (158 F) 75.0% CAWN >70 C (158 F) 80.1% *Viscosity measured at 25 C (77 F). Please note viscosity can vary greatly depending on ink temperature, volume of ink tested, type of viscometer used and the test method. Volatile Organic Content (VOC) 290g./L. (mixed & unthinned) TYPICAL PHYSICAL & CHEMICAL PROPERTIES OF IMAGECURE XV501T-4 CURED FILM Solder Resistance MILP C (550 F) IPC SM840C C (500 F) Resistance to Solder Levelling Electroless Ni/Au Plating > 5 passes Resistance to Fluxes IPC SM840C Hydrolytic Stability IPC SM840C Class H Solvent, Cleaning Agent, & Flux Resistance IPC SM840C Class H Fungal Resistance IPC SM840C Class H Thermal Shock IPC SM840C Class H MIL MIL STD202E BS6096 Tests Chemical Resistance IPA 1,1,1 Trichloroethane MEK Methylene Chloride Alkaline Detergent Fluxes Abrasion Pencil Hardness IPC SM840C Class H 6-7 H Adhesion (Copper) IPC SM840C Class H Ionic Contamination MILP55110D <0.3µg. NaCl/cm² Using Alpha Ionograph 500M Tg DMTA (tan δ) 150 C Coefficient of Thermal Expansion 50ppm / C Thermal Conductivity 0.5W/m K T217/3 Page 6 of 7 May 2006

7 12) FILM PERFORMANCE / TECHNICAL SPECIFICATION (cont.) TYPICAL ELECTRICAL PROPERTIES OF IMAGECURE XV501T-4 CURED FILM Bellcore TR-NWT Insulation Resistance IPC SM840C Classes T and H Moisture & Insulation Resistance IPC SM840C Classes T and H Electromigration IPC SM840C Classes T and H Comparative Tracking Index IEC 112 >400 Siemens E-Corrosion Test SN Dielectric Strength IPC SM840C Class H 150kV/mm. (50 Hz.) DIN ) DISCLAIMER This information has been carefully compiled from experience gained in field conditions and extensive laboratory testing. However the products performance and its suitability for the customers purpose depend on the particular conditions of use and the material being printed. We recommend that customers satisfy themselves that each product meets their requirements in all respects before commencing a production run. Since we cannot anticipate or control the conditions under which our products are used, it is impossible to guarantee their performance. All sales are also subject to our standard terms and conditions. 14) SUPPORT Sun Chemical Circuits are an international company, and as such can offer technical, engineering and sales support to our customers worldwide. If you require more information regarding this product, or any of our extensive range of materials for PCB fabrication, please contact our local sales offices. T217/3 Page 7 of 7 May 2006