Synthetic machining coolants

Identity and related fluid classes

TRIM C270 lists pH 9.0–9.3 for the concentrate. Crystal Cut 465 reports pH 9.1–9.4 at a 10% analytical dilution, without specifying the percentage basis. The reports give no common method or test temperature and cannot establish a working-fluid pH ranking. C270 TDS Crystal Cut brochure NIOSH distinguishes water-miscible synthetic fluid without petroleum oil from synthetic neat oil. NIOSH Publication 98-116, section 2, printed page 3

Buffers, corrosion inhibitors and microbial-control agents can be ingredients or separately supplied additives. A complete coolant has its own formulation. NIOSH Publication 98-116, printed page 1 NIOSH metalworking-fluids overview

Synthesis. In this classification, absence of petroleum oil describes a formulation class. It does not establish that every molecule has a non-petroleum feedstock, or that every product is boron-free, amine-free, chlorine-free, or formaldehyde-free. Such claims need their own exact-product evidence.

Product identity and applicability

These examples identify supplied products, not substitutes or a performance ranking.

Synthesis. A process name or alloy family does not establish compatibility with every workpiece condition, tool coating, seal, paint, or downstream finish. Primary and secondary application labels also do not establish a customer's approved process.

Reported quantities and sample bases

The following are document properties and analytical sample conditions, not working-fluid settings or preparation instructions.

Sources for the complete columns are C270, page 2, physical-property table and Brix chart and Crystal Cut 465, page 2, product-characteristics table.

Crystal Cut 465's SDS repeats the pH interval without a dilution basis. Matching numbers do not establish that the SDS reports concentrate pH. It also repeats the specific gravity and viscosity entries. SDS, section 9, page 3.

Synthesis. pH is dimensionless and belongs to the tested sample. A diluted-sample pH cannot be assigned to concentrate or used fluid. Specific gravity is a dimensionless relative density, not a density in kg/L. A density conversion needs its reference basis. 1 cSt = 1 mm²/s. SUS denotes a viscosity-related efflux time in Saybolt Universal seconds. The two listed viscosity ranges use different temperatures and are not an exact same-temperature conversion.

The C270 chart defines its factor as a multiplier of the refractive reading. The factor is not the fluid's optical refractive index. C270, page 2. Synthesis. A product factor does not establish that a reading independently measures active lubricant, microbial condition, or dissolved workpiece metal. The two products' factors cannot be interchanged.

Composition claims and unresolved disclosure

Synergy 735's free-of list includes bactericide, boron, chlorine, formaldehyde, and sulfur. Its asterisk says "Without active addition of chlorinated EP additives." No detection limits or lot assay establish analytical zero. Blaser brochure, page 2 and footnote.

Crystal Cut 465's brochure states "No Free Amines," while its SDS identifies triethanolamine, CAS 102-71-6. The SDS's section 3 table reports 1.5 weight-%, and its section 15 table reports 15 weight-% for the same substance. The document does not reconcile these entries or define free amines. Neither percentage is adopted here as established composition. Brochure, page 1; SDS, pages 1 and 6.

An SDS is not necessarily a complete formula. OSHA's Appendix D requires mixture disclosure of ingredients classified as health hazards under specified conditions and includes trade-secret provisions. Omission from section 3 does not by itself prove absence. This is a limit of disclosure, not evidence that a particular omitted ingredient exists. OSHA Appendix D, table D.1, section 3.

Synthesis. A manufacturer's free-of statement, an SDS entry, an analytical result below a detection limit, and a batch assay answer different questions. Unreported chemistry remains unknown. These documents do not establish a manufacturing recipe or explain every ingredient's chemical state.

Performance claims and their limits

C270's sheet claims corrosion inhibition on common ferrous alloys, low foam, oil rejection, and a soft residual film that redissolves in working solution. It supplies no comparative corrosion endpoint, foam-test protocol, or quantified cleanability result. C270, page 1.

Synergy 735's brochure links neutral pH to aluminum surface appearance and claims low foam and easy rinsing. It supplies no numerical pH, foam height, pressure, exposure duration, or cleanliness acceptance criterion. Its photographs do not establish those missing test conditions. Blaser brochure, both pages.

Synthesis. Rust protection, lubricity, foam behavior, cleanability, and biostability are separate properties. The reviewed documents provide no common conditioned test that supports a cross-product ranking or guarantees corrosion-free parts, tool life, or a residue-free finish. Missing alloy, water chemistry, specimen preparation, endpoint, and variability prevent such deductions.

Used fluid is a different sample from the supplied concentrate or a fresh analytical dilution. NIOSH describes contamination by ancillary lubricants, workpiece particles, cleaning chemicals, and microorganisms. A fresh-product composition or biostability claim therefore does not characterize a used sump or fluid residue on a part. NIOSH Publication 98-116, printed pages 4 to 5; NIOSH overview.

Source versions and coverage limits

Reviewed October 30, 2026, PDT. The North American US-English C270 sheet has footer date 2026-10-30, without a separate formula-revision number. Its login-only SDS was not reviewed. C270, pages 2 to 3.

The Crystal Cut 465 brochure states June 24, 2008, revised July 12, 2023. Its English SDS identifies US OSHA and Canadian WHMIS frameworks, revision number 2, and revision date May 18, 2023. These dates do not prove the current formulation in every market. Brochure, page 2; SDS, pages 1 and 7.

The Synergy 735 brochure has a (0221) code, without an explicit revision date or formulation article number. No matching regional SDS or quantitative TDS is adopted here. NIOSH Publication 98-116 is the March 1998 educational reference, used only for classification, fluid roles, and contamination distinctions. Blaser brochure; NIOSH title and publication pages.

The evidence does not establish complete proprietary formulas, lot conformity, universal metal compatibility, current customer approvals, or actual shop performance. This reference provides no manufacturing mix, production dilution, replenishment, maintenance, or disposal procedure.

Related references

Water-based machining coolants is the broader formulation topic. Semi-synthetic machining coolants covers the neighboring class. Surface grinding and resin-bonded grinding wheels concern separate process and abrasive identities. These related pages are unpublished drafts at review.