Technical Knowledge – Page 2 | Ningbo MOS Chemical Co., Ltd.

Illustrative inspection bench with two matching machined steel coupons, a caliper and a blank trial record beside a CNC cell

Technical Knowledge · 2026-10-14

Soluble Oil vs Synthetic Coolant: A Machining Trial That Can Decide

Select a water-miscible cutting-fluid family for a defined operation. Compare supplier grades under controlled conditions before specifying a replacement.

Illustrative enclosed machining cell applying milky coolant to a secured metal workpiece

Technical Knowledge · 2026-10-12

Metalworking Fluid Water Quality: Diagnose Before Changing Oil

Foam, deposits or corrosion in a water-miscible metalworking fluid do not identify one cause. Replacing the concentrate before separating incoming-water quality from the condition of the working sump can simply repeat the problem. The useful first decision is which sample to coll

Illustrative diesel fleet vehicles in an industrial logistics yard at dawn

Technical Knowledge · 2026-10-11

API CK-4 vs CI-4: Diesel Oil Selection for Fleet Buyers

What CK-4 coverage of CI-4 means—and the separate viscosity, OEM, fuel and exact-product checks a fleet buyer still needs.

Illustrative sealed HFC fluid sample beside a closed industrial hydraulic reservoir

Technical Knowledge · 2026-10-11

HFC Hydraulic Fluid: Water Content Monitoring and RFQ Checks

A maintenance and procurement guide to sampling, supplier-specific water-content assessment and documented HFC fluid decisions.

Representative manual gearbox cutaway and separate differential beside unbranded gear-oil containers

Technical Knowledge · 2026-10-02

GL4 vs GL5 Gear Oil: Gearbox and Axle Selection Checks

The higher GL number is not a universal upgrade. Separate service category, viscosity and OEM compatibility before buying replacement gear oil.

Fleet technician compares sealed brake-fluid samples beside a vehicle brake assembly

Technical Knowledge · 2026-09-24

DOT 3 vs DOT 4 Brake Fluid: Fleet Specification Checks

DOT 3 and DOT 4 are separate FMVSS No. 116 brake fluid designations. The B2B decision is not a higher-number rule; it is an OEM grade and document check using current TDS/COA, service context, and contamination control.

Illustrative grease samples, bearing and grease gun for industrial lubricant selection

Technical Knowledge · 2026-09-23

NLGI 2 vs 3 Grease: Industrial Selection and RFQ Checks

NLGI 3 grease is firmer than NLGI 2. The grade describes worked penetration consistency, not base-oil viscosity, quality, load capacity, or temperature rating. Maintenance and procurement teams should confirm grade-specific evidence before substitution.

Illustration of ISO VG 32 and 46 oil samples beside an industrial hydraulic system

Technical Knowledge · 2026-09-18

Hydraulic Oil 32 vs 46: Purchasing & Changeover Guide

Hydraulic oil 32 vs 46 is a choice between viscosity grades: ISO VG 46 has higher kinematic viscosity at the 40°C reference temperature. That does not make it a better lubricant for every machine. Procurement needs the pump or equipment manufacturer's permitted fluid specification and viscosity range at startup and in service before accepting either grade.

Lubricant Technical Knowledge