A listing that combines “Optical IV,” “Dexel,” and “filtrate” may describe a microscope, a contamination-analysis accessory, or several separate products rather than one complete field system. By the end, you will know how to verify the exact equipment, specify the replication consumables, test a supplier’s claims in New Delhi, and avoid buying a microscope without the tools needed for defensible metallographic evidence.
Key takeaways
- Request the manufacturer, model number, datasheet, and function for every catalogue item.
- Buy the complete field kit, including preparation, illumination, imaging, and documentation tools.
- Record location, orientation, etchant, exposure time, and images during every replication.
- Confirm alloy compatibility and demand demonstration results before placing a purchase order.
Decode the listing before you request a quotation
A search for “in situ metallography kit with dexel filtrate optical iv in new delhi” may combine unrelated catalogue terms. Treat “Dexel,” “Filtrate,” and “Optical IV” as unverified labels until the seller provides the exact manufacturer, model number, datasheet, and function for each item. “Optical IV” is not a generic metallography category.
A complete field-replication system should account for the entire examination, not only magnification:
- Check for a portable grinder or milling tool, abrasive papers, diamond paste, polishing cloths, etchant, swabs, cleaning materials, replica film, adhesive, release medium, illumination, camera, and carrying case.
- Ask whether the microscope and camera are included or quoted separately. Require optical magnification, sensor resolution, working distance, lighting method, and measurement calibration using a stage micrometer or certified scale.
- Reject a “filtrate” accessory unless its membrane material, pore size, filtration area, solvent compatibility, blank controls, and evaluation method—gravimetric, visual, or image-based—are stated. It is not automatically part of metallographic replication.
- Cite ASTM E1351 and request a sample field-replica report showing scaled images, not an unscaled camera view that cannot support crack-width or feature-size measurements.
- For “optical iv in new delhi,” request current stock confirmation tied to the exact model, included accessories, delivery point, warranty location, calibration status, and lead time. A stock label alone does not prove immediate supply.
Specify the complete kit, not just the microscope
A complete in situ metallography kit equipment package must let you prepare the surface, make a replica, and examine the transferred image.
Ask for a line-item bill of materials, not a label: a portable optical microscope, surface grinder or milling tool, abrasive papers, diamond paste, polishing cloths, etchant, swabs, replica film, adhesive, release medium, cleaning materials, illumination, camera, and carrying case. Confirm whether the microscope is included or sold separately.
ASTM E1351 is the relevant reference for field metallographic replicas.
- Surface preparation: grinder or milling tool, abrasive papers or films, diamond paste, polishing cloths, cleaning solvent, lint-free swabs, and etchant or electrolytic-polishing equipment.
- Replication: replica film, adhesive, release medium, applicators, curing protection, labels, and storage sleeves.
- Examination: microscope, interchangeable objectives, controllable illumination, camera, calibration scale, power supply, and protective case.
For optical IV in New Delhi, require the exact manufacturer, model number, detector specification, and datasheet. “Optical IV” alone does not define a metallography instrument.
| Specification | What matters on replicas | Why it matters |
|---|---|---|
| Microscope | Objectives, magnification range, numerical aperture, working distance, focus control, and oblique or coaxial illumination | Reveals scratches, pull-outs, weld structure, and confined surfaces without losing focus |
| Camera | Sensor size, pixel count, exposure control, white balance, image format, and live-view connection | Preserves contrast and detail instead of producing an unrepeatable screen image |
| Documentation | Calibrated scale, objective used, illumination mode, replica ID, and image file | Lets a later reviewer separate material features from preparation or imaging artifacts |
Follow a field-replication workflow that preserves evidence
A replica records the prepared surface, not the material beneath it. Treat the in situ metallography kit equipment list as a field evidence system: it needs a portable surface grinder or milling tool, abrasive papers, diamond paste, polishing cloths, etchant, swabs, replica film, adhesive, release medium, cleaning materials, illumination, camera, and carrying case.
Confirm whether the microscope is included or supplied separately.
1. Identify the component, weld, and exact examination location. Photograph the unprepared area, mark its orientation, remove coating without gouging the metal, and clean away oil and loose debris.
2. Grind progressively with fresh abrasive papers, changing direction between grades so earlier scratches become easy to remove. Keep the surface cool. Scratches that remain parallel to the final grinding direction, metal pull-outs, and smeared metal are preparation artifacts, not microstructure.
3. Polish with diamond paste and a clean cloth until the surface is reflective and free of drag marks. Inspect under oblique light; repeat polishing if pits, embedded abrasive, or directional scratches remain. Etch with the specified reagent or electrolytic method, then stop, rinse, and dry promptly.
Darkened, widened boundaries and a uniformly stained field indicate over-etching.
4. Apply the replica film with the specified adhesive or release medium, remove trapped air, allow it to cure, then peel and label it with component, location, date, preparation stages, and etchant.
5. Mount and examine the replica using the objective, illumination mode, magnification, calibrated scale, and image file recorded in the report. Repeat preparation or replication when a feature disappears, follows a scratch, or changes with lighting; cite ASTM E1351 for replica production and evaluation.
Match the etchant and weld inspection method to the alloy
Use an alloy-specific etchant, not a generic bottle supplied with in situ metallography kit equipment. Confirm the procedure, concentration, contact time, temperature, and disposal route before applying it to a field component.
| Alloy or area | Suitable starting etchant or method | Essential controls |
|---|---|---|
| Carbon steel | 2–5% nital for ferrite, pearlite, martensite, and weld heat-affected zones | Use a fume hood or local extraction, chemical-resistant gloves, eye protection, and fresh swabs; keep nitric acid away from incompatible materials. |
| Stainless steel | Glyceregia or electrolytic oxalic-acid etching, selected for the grade and target phase | Use a written procedure, ventilation, face protection, and stainless-specific electrolyte; control voltage, current, electrode spacing, interlocks, and spills. |
| Aluminium | Keller’s reagent or an approved alternative selected for the alloy | Treat hydrofluoric-acid-containing formulations as high-hazard chemicals; require HF controls, calcium gluconate availability, suitable gloves, extraction, and waste segregation. |
| Copper alloys | Ammonium persulfate or ferric-chloride solution | Prevent skin and eye contact, control staining and corrosion, label the solution, and collect metal-bearing waste. |
| Weld metal | Match the parent alloy and consumable; use nital for carbon-steel welds and an approved electrolytic method for suitable stainless grades | Record weld procedure, consumable, etchant, exposure time, and surface orientation. |
Across a field weld, replicate and compare:
- Weld cap, toes, root, fusion lines, and both sides of the heat-affected zone.
- Parent metal away from the weld for baseline grain structure.
- Cracks, porosity openings, inclusions, lack of fusion at the exposed surface, sensitisation, overheating, and grinding damage.
Follow ASTM E1351 for field replicas. Replication examines only the prepared surface; use ultrasonic, radiographic, magnetic-particle, or dye-penetrant testing for evidence beyond it.
Verify availability, demonstration results, and supplier accountability
A quoted model is not proof of stock. For Dexel Filtrate Optical IV availability, ask for a dated confirmation naming the manufacturer, exact model number, serial or batch status, delivery point in New Delhi, included accessories, calibration status, warranty location, and lead time for imported or back-ordered items.
If you are requesting an in situ metallography kit with Dexel Filtrate Optical IV in New Delhi, resolve the terminology before comparing prices. Ask whether “Dexel,” “Filtrate,” and “Optical IV” are exact product names, model names, or separate instruments.
Require a datasheet and line-item bill of materials showing the microscope, camera, illumination, preparation tools, replica materials, and carrying case.
Require a demonstration on your representative alloy, surface geometry, and target feature. A flat coupon does not prove performance on a weld toe, pipe interior, turbine component, or confined location.
Ask the supplier to provide:
- A live image from your sample, with magnification, objective, camera model, lighting, and file metadata recorded.
- Evidence that the kit supports field replication under ASTM E1351, not merely portable viewing.
- Calibration certificates, serial-number records, warranty terms, service location, spare-parts lead time, and operator training scope.
- A written statement identifying what is immediately available and what will be ordered after purchase.
For an Optical IV in New Delhi, Conation Technologies Pvt. Ltd. should be assessed against the same documentation and demonstration checklist as any supplier. A polished quotation without these records leaves compatibility and delivery unproven.
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Frequently asked questions
What should you verify before requesting a quotation for an in situ metallography kit?
Ask the seller to identify the exact manufacturer, model number, datasheet, and function for labels such as “Dexel,” “Filtrate,” and “Optical IV.” Treat those terms as unverified until the seller explains them.
What should a complete in situ metallography kit include?
Specify more than the microscope. Confirm the surface-preparation equipment, lighting, imaging system, replication materials, cleaning supplies, measurement accessories, power requirements, software, documentation, and carrying case included in the quotation.
How do you preserve evidence during field metallography?
Document the component identity, inspection location, surface orientation, preparation steps, etchant, exposure time, lighting, magnification, and image file details. Keep the replication record with the resulting images.
How do you choose an etchant and weld inspection method?
Match the etchant and inspection method to the alloy and weld condition. Confirm compatibility with the base metal, weld metal, and heat-affected zone before applying it to the component.
How can you check supplier accountability and availability in New Delhi?
Request written stock or lead-time confirmation, a live demonstration or representative inspection results, an itemised quotation, warranty terms, calibration or verification records, training scope, service contacts, and a clear list of exclusions.
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