By the QISHANR Technical & Supply Team · Published 8 October 2026
Account review · BITZER B320SH (complex ester, 310 cSt) · Two CSH compact screw compressors on R22
BITZER B320SH is a complex ester refrigeration oil at 310 cSt at 40 °C, the oil BITZER specifies for its CSH and CSW compact screw compressors on R22. It sits in the KC oil group to DIN 51503-1 rather than the KD group used by the polyol ester grades, which is the point a site has to get right when two refrigerants are in the same building.
| Item | Detail |
|---|---|
| Customer | A cold storage operator (not named) |
| Machines on B320SH | Two BITZER CSH compact screw compressors, both still on R22 |
| Machines on BSE32 | The smaller reciprocating units |
| Account age | Three years, with one engineer handling it throughout |
| Reorder process | A single email, against grades fixed at the start of the account |
| Every shipment | TDS and batch COA, filed against the plant's own records |
| Batch record over three years | Viscosity matched every batch, with no deviations logged |
| Stock position | B320SH on a standing quarterly order, so drums are never short before peak season |
| Three-year outcome | No compressor stopped for an oil-related reason |
We asked them to write down what three years of one account has looked like from their side. This is what they sent.
Three years ago we moved all our Bitzer oil buying to QISHANR — B320SH for the two CSH compact screw compressors in our cold storage (both still on R22), and BSE32 for the smaller reciprocating units. What I value most is that the same engineer has handled our account since day one. He helped us standardize the grades when we started, so there's no second-guessing at reorder time; today a reorder is a single email. Every shipment comes with the TDS and batch COA, and we keep our own records — the viscosity has matched every single batch in three years, no deviations. We've since put the B320SH on a standing quarterly order, so the drums are never short before the peak season. In three years, not one of our compressors has stopped for an oil-related reason. That's the kind of supplier you stop shopping around for.
The work that made the last three years quiet happened at the beginning: two machine groups, two chemistries, one account. A complex ester is a refrigeration oil chemistry specified for HCFC systems such as R22, and it is a different chemistry from the polyol ester grades used with HFC and HFO refrigerants.
The two CSH compact screw compressors run on R22, so the chemistry follows the refrigerant: B320SH, in the KC oil group to DIN 51503-1. Its 310 cSt at 40 °C sits inside the ISO VG 320 band of 288 to 352 cSt per DIN ISO 3448.
The smaller reciprocating units take a polyol ester instead — BSE32 at 32 cSt — because their refrigerant is not R22. Two grades, two groups, and no risk of a storeman reaching for the wrong drum.
That is the part we do for a new site: confirm each grade against the machine and the refrigerant it holds, then write it into the account so a reorder is a code.
The other half of the standardisation is a person: one engineer held this account for three years, which is why the records, grades and pack sizes have stayed aligned.
Fig. 1 — How two machine groups on two refrigerants were standardised onto two grades and one account.
A grade confirmed correctly is a one-off event. A batch record that holds up for three years is a process a buyer can check without trusting anybody.
A batch certificate of analysis is the document that carries the measured properties of one production batch, and it is what links the oil in a machine to a specific manufacturing run.
Every shipment has gone out with a technical data sheet and a batch COA, and the plant files both against its maintenance records. Their conclusion after three years: the viscosity matched every batch, with no deviations logged.
Viscosity is the figure that would show a blending problem first, and it is measured under ASTM D445.
The other two lines an engineer reads on a complex ester COA are water content and total acid number, because these chemistries react with moisture. B320SH is formulated to exceed the DIN 51503-1 requirements for both; water content is determined under ASTM D6304, the Karl Fischer method.
Keeping the sheets is the plant's habit. It is also why their three-year statement carries weight: a claim of no deviations is only as strong as the documents behind it.
A standing order turns supply from an event into a rhythm: four deliveries a year against a known grade, planned ahead of the peak season.
It changes the failure mode too. Without a standing order the plant carries a stock level it has to judge, and that judgement is tested in the weeks before peak season.
On our side a quarterly rhythm is easier to serve than an emergency: the grade is fixed, the pack sizes are known, and documents are issued with each delivery. A machine can be added without renegotiating anything.
B320SH travels in 5 L, 10 L and 20 L packs. The minimum order on the grade is confirmed per order rather than fixed in a contract, which lets a plant tune the standing quantity to its own store.
We sell oils; what keeps an account for three years is everything that travels with them. Send the machine list and the refrigerants, and we will standardise the grades across the site.
On supply, we ship the original BITZER product or the equivalent we manufacture ourselves — Qishanr QSL-320H for this grade, made in Foshan, Guangdong. Either route keeps one document set.
On terms, the pack sizes are 5 L, 10 L and 20 L, and the minimum order is confirmed per order. We quote any Incoterms 2020 rule including EXW, FOB, CFR, CIF and DDP, and payment runs on T/T, L/C or PayPal. Private-label supply is available on quotation.
On continuity, the same technical contact stays with the account, which is the difference between a supplier who knows your machine list and a website that holds your order history.
On documents, the CE certificate, certificate of origin, MSDS and transport identification report are issued as standard rather than on request, and third-party testing can be arranged.
What travels with every shipment on this account
The published figures for the grade this cold store runs on its two screw compressors.
| Parameter | Value | Source |
|---|---|---|
| Product | BITZER B320SH | — |
| Base oil | Complex ester | — |
| Oil group | KC — the R22 group, not the KD group of the POE grades | DIN 51503-1 |
| Viscosity at 40 °C | 310 cSt, inside the ISO VG 320 band (288–352 cSt) | DIN ISO 3448 |
| Kinematic viscosity at 100 °C | 32 cSt | Product data |
| Flash point | 258 °C | Product data |
| Pour point | −42 °C | Product data |
| Density at 15 °C / 100 °C / −30 °C | 1.016 / 0.958 / 1.052 g/ml | Product data |
| Specific heat capacity at 40 °C / 100 °C | 1.68 / 1.85 kJ/kg·K | Product data |
| Thermal conductivity at 40 °C / 100 °C | 0.12 W/m·K | Product data |
| Refrigerant | R22 | — |
| Compressors | BITZER CSH and CSW compact screw compressors | — |
| Our equivalent | Qishanr QSL-320H, same viscosity class, made in Foshan | — |
| Pack sizes | 5 L, 10 L, 20 L — minimum order confirmed per order | — |
| Documents | TDS, SDS, batch COA | — |
A: Because the chemistry follows the refrigerant. R22 is an HCFC, and B320SH is a complex ester in the KC oil group to DIN 51503-1. The polyol ester grades sit in the KD group and serve HFC and HFO refrigerants such as R134a, R404A, R407C or R507A.
A: No. They are different chemistries for different refrigerants, so each machine keeps its own grade — and distinct codes on one account are what stop a top-up from becoming a chemistry problem.
A: A technical data sheet and a batch certificate of analysis with every delivery, plus a safety data sheet. For export orders the CE certificate, certificate of origin, MSDS and transport identification report are issued as standard; third-party testing is arranged on request.
A: The minimum is confirmed per order rather than fixed in a contract, and the grade travels in 5 L, 10 L and 20 L packs. That is deliberate: a standing quarterly quantity is easier to tune when the minimum can move with the season.
A: Send the machine list, the refrigerant in each group and the grades you have been using. We confirm the grade and the oil group for each machine, fix them on the account, and quote the standing quantity against your own store rather than a catalogue.
Running several machine groups on more than one refrigerant? Send the machine list and the refrigerants — we standardise the grades, fix them on your account and quote the standing quantity.
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