- Jai Bhavani Nagar, Wagle Industrial Estate, Thane West, Thane, Maharashtra 400604
The Finetech Engineering Crescent Cutter is a precision die used to prepare crescent-shaped tear test specimens from vulcanised rubber and thermoplastic elastomer sheets. As a dedicated crescent cutter manufacturer India, we supply this crescent die cutter for rubber testing to QC labs, R&D departments, and NABL-accredited testing houses across the country. The crescent shape is specifically designed for tear propagation testing – measuring how a pre-existing tear grows through a rubber material under tensile load.
Unlike the ASTM D624 Type C angle die (which measures tear initiation from a sharp corner), our ASTM D624 crescent specimen cutter (Type A and B) requires a small razor nick at the inner concave edge of the specimen before testing. This nick – precisely 0.50 +/- 0.05 mm deep per ASTM D624 – creates the controlled stress concentration from which the tear propagates. The force required to propagate this tear, divided by the specimen thickness, gives the tear propagation strength in N/mm or kN/m.
As your ISO 34 crescent cutter India manufacturer, Finetech produces both Type A (crescent without gripping tabs – for smaller samples) and Type B (crescent with gripping tabs – preferred for better grip alignment and more consistent results). Both types are available with or without an integral nicking device built into the die.
Feature | Type A (No Tabs) | Type B (With Tabs) |
Specimen Shape | Crescent only – no gripping tabs | Crescent cutter with extended gripping tabs at both ends |
What It Measures | Tear propagation strength | Tear propagation strength (same property) |
Nick Required? | Yes – 0.50 +/- 0.05 mm at inner concave edge | Yes – 0.50 +/- 0.05 mm at inner concave edge |
When to Use | When rubber sheet is too small for Type B | Preferred whenever material size allows |
ISO Equivalent | Not directly specified in ISO 34-1 | ISO 34 crescent cutter India – ISO 34-1 Method C (crescent test piece) |
Grip Alignment | Harder – no tabs to reference against grip faces | Easier – tabs sit squarely in grip faces |
Recommendation | Use only when Type B is not possible | Always preferred – best crescent die cutter for rubber testing choice |
Method | How It Works | Pros | Cons |
Integral nicker (built into die) | Nicking blade is part of the crescent cutter – nicks simultaneously with the cut | Consistent depth every time. No separate step. Fastest. | Slightly higher die cost. Blade needs periodic replacement. |
Separate nicking apparatus | Standalone device holds cut specimen and guides razor at specified depth | Adjustable. Handles multiple specimens. | Extra step. Higher operator variability risk. |
Manual razor nick | Operator nicks by hand with razor and template | Lowest cost | Highly inconsistent. Not recommended for accredited labs. |
ASTM Standard | ISO Equivalent | Specimen Type | Description |
ASTM D624 crescent specimen cutter – Type A | Not directly in ISO 34-1 | Crescent, no tabs, nicked | Tear propagation. For small samples. |
ASTM D624 crescent specimen cutter – Type B | ISO 34 crescent cutter India – ISO 34-1 Method C | Crescent, with tabs, nicked | Tear propagation. Preferred. Modified to conform to ISO 34. |
ASTM D624 Type C | ISO 34-1 Method B | Right angle (90 deg), un-nicked | Tear initiation – NOT crescent. See Tear Specimen Cutter page. |
Parameter | Specification |
Product Name | Crescent Cutter (Crescent Tear Die) – Crescent Cutter Manufacturer India |
Types Available | Type A (crescent, no tabs) and Type B (crescent with gripping tabs) – preferred |
Standards Supported | ASTM D624 Crescent Specimen Cutter Type A & B | ISO 34 Crescent Cutter India – ISO 34-1 Method C | IS 3400 Part 3 | JIS K6252 |
Nicking Device | With integral nicker or without (separate apparatus available) |
Nick Depth | 0.50 +/- 0.05 mm (0.020 +/- 0.002 inch) per ASTM D624 |
Blade Material | Hardened tool steel (EN-31 / equivalent) – every crescent die cutter for rubber testing Finetech product |
Blade Hardness | 50-56 HRC |
Cutting Edge Finish | Precision ground and polished. Inner faces perpendicular, polished min. 5 mm from edge. |
Wall Thickness | Minimum 5 mm |
Operation | Used with Hydraulic / Manual / Pneumatic Press |
Specimen Thickness | Standard: 2.0 +/- 0.2 mm per ASTM D624 |
Test Speed | 500 +/- 50 mm/min (jaw separation rate) |
Certification | NABL-traceable dimensional certification available |
Custom Sizes | Available per customer drawing |
Integral nicker option. Nicking blade built into the crescent cutter die. One press stroke = perfectly nicked crescent. No separate step, no operator variability, no inconsistent nicks.
Both Type A and Type B. As a full-range crescent cutter manufacturer India, we manufacture both variants in-house. Most customers need Type B, but Type A is available for small-sample applications.
NABL certification available. NABL-traceable dimensional certification for die profile and nick depth – essential for accredited labs testing with our ASTM D624 crescent specimen cutter or ISO 34 crescent cutter India products.
Precision nick depth. Integral nicker in our crescent die cutter for rubber testing is engineered for exactly 0.50 +/- 0.05 mm – the single most important variable in crescent tear testing.
Complete tear testing supply. We also manufacture UTMs, grips, hydraulic presses, and flat sheet moulds. One supplier for your entire workflow from crescent cutter to final test result.
Product | Why Related |
Tear Specimen Cutter (Type C Angle & Type T Trouser) | For tear initiation (Type C) and trouser tear (Type T) |
Dumbbell Specimen Cutter | For tensile testing – most labs need both tensile and tear cutters |
Nicking Apparatus (Standalone) | For labs preferring a separate nicking device for crescent cutter specimens |
Universal Testing Machine | Runs the crescent die cutter for rubber testing test at 500 mm/min |
Hydraulic Press (Manual) | Drives the ASTM D624 crescent specimen cutter through rubber sheet |
Flat Sheet Mould (ASTM D3182) | For moulding rubber sheets from which specimens are cut |
Customisation available
