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改性尼龙行情波动时怎么采购？买多买少，做错代价更大

应用领域 发布时间: 2026-09-12 4596 阅读

How to purchase 200 modified nylon during market fluctuations

Talk about an incident that wasn't too costly but was very representative.

There was a buyer of motorcycle parts who couldn't sit still during the third week of a rapid price surge. The situation at the time was: the upstream prices had risen for four consecutive weeks, rumors were circulating in the market that a certain device would be shut down for maintenance, and everyone in his social circle was saying that prices would continue to rise.

His actions were very decisive: he locked in six months' usage at once, with the price 18% higher than a month ago.

Looking back two months later, the market did rise for a few more days, then turned down, and by the fourth month it had basically returned to the starting point.

Over the past six months, the extra price he paid added up to quite a bit more than usual for normal purchases. What's worse is that the stock he hoarded took up two warehouse spaces, and part of it got damp during the rainy season, so re-drying it was another expense.

He later summed it up very frankly:

"I didn't judge the wrong direction; I placed a bet on a piece of information I couldn't verify at all during the most expensive week."

This article talks about which actions follow a pattern when the market comes, and which ones are just gambling.

When purchasing during market fluctuations, first distinguish between two prices: the processing fee for modified nylon is relatively stable, while the base material price follows caprolactam and bulk commodities—by separating and monitoring these two layers, price changes will no longer be a confusing mess.

1. How does the market trend get transmitted to nylon?

First clarify the chain, then the judgment will have a basis.

A chain from top to bottom

link; segment; partExplanationConduction time
Crude Oil and EnergyThe starting point of the entire chemical industry chainOne to three months
Basic chemical raw materialsUpstream of synthetic fiber monomers, such as benzene compoundsOne to two months
Intermediates such as caprolactam and adiponitrileDirectly determines the cost floor of PA6 and PA66Two to six weeks
Resin sliceDirectly determine the base material price of the modified materialOne to four weeks
Modified materialSuperimposed fiberglass, flame retardant, additives, and processing feesConduction relatively delayed

The most useful part of this table is the last row: the modified material is at the end of the chain, and the transmission is lagging.

This means two very important things:

When upstream prices rise, the quotes from modified material manufacturers are often passively following; they are also bearing the costs themselves.

When the upstream prices fall, the prices of modified materials also adjust downward more slowly—in this delay, there is both the inertia of the inventory cycle and some rigidity in processing fees.

Why are the fluctuations in glass fiber reinforced materials relatively small?

For the same type, the fluctuation amplitude of the glass fiber reinforced system is usually smaller than that of the pure resin.

The reason is that its cost structure includes a considerable proportion of glass fiber, additives, and processing fees, whose fluctuations are much smaller than those of upstream resin. So don't use the increase in resin prices to infer the increase in modified product prices—this is a common misunderstanding during price negotiations.

2. The Three Most Common Mistakes in the Market

The common characteristic of these mistakes is that at the time, it felt like 'actively coping,' but in hindsight, it was taking unnecessary risks.

Mistake 1: One-time stockpiling driven by messages

Like the one at the beginning. The triggering action was an unverified piece of news (a certain device stopping, a certain factory needing maintenance), rather than one's own usage rhythm.

The problem with this kind of news is not whether it's true or false, but that you don't have a way to verify it, nor the ability to estimate how many tons of supply it affects.

Placing a heavy bet on information that one cannot falsify is essentially not a procurement decision, but speculation.

Mistake 2: Panic Switching of Suppliers

As soon as the market rises, immediately look for a cheaper supplier to replace it. This is an action that simultaneously amplifies price risk and supply risk.

The previous article about changing materials covered the same logic: new supply means re-verification, batch uncertainty, and certification changes. And when the market is tight, that's precisely when you have the least time to do these verifications.

Mistake Three: Continuously bottom-fishing in a downtrend channel

When the market keeps going down, many people's action is: adding a bit of position every week based on the feeling that it 'seems to have bottomed out'.

The result is usually: after patching for three weeks, it’s still falling.

The bottom can only be seen in hindsight. The prices at which you buy in multiple times in a downward channel often aren't as cost-effective as 'waiting for the right-side signal to appear and then buying all at once.'

3. How to determine which stage you are currently in

It's also not okay to completely ignore the market. It is recommended to use a few observable objective signals, rather than feelings.

Four observable signals

Signal one, the dynamics of upstream facilities. Planned maintenance of large facilities, unexpected shutdowns, and new capacity startups — this information can usually be found in industry media and is verifiable.

Signal two: the price difference between intermediates and resin. If resin rises while intermediates remain unchanged, it is mostly a short-term supply disruption, not a trend.

Signal three, industry inventory days. When inventory is low and continuously being reduced, price elasticity is greater; when inventory is high, the price increase is usually limited.

Signal four: the validity period of the supplier's quotation. This is a very practical observation point: if the quotation validity period is shortened from one month to one week or even three days, it usually indicates that the upstream is undergoing drastic changes.

Things not recommended as a basis

Messages in the group, statements on Moments

Oral judgment by a single supplier (he has a vested interest)

The kind of intuition that goes 'it has risen for a long time so it must fall, it has fallen for a long time so it must rise'

A practical remark

The purpose of the judgment phase is not to scout spots, but to decide whether this month's actions should be more conservative or more aggressive.

Use it as a basis for adjusting the rhythm, not as a basis for placing orders. The difference between the two is very important.

A price curve that you can make by yourself

Rather than looking at the market analysis given by others, it's better to build your own line.

The specific method is very simple: on a fixed day each month, ask two to three suppliers for the spot price and thirty-day credit price of the same brand, and record it on a single sheet.

After saving this sheet for twelve months, you will notice three things:

First, seasonality has emerged. When things are tight and when things are loose, your own data is more accurate than any analysis.

Secondly, the differences in each company's quotes became apparent. Who is always one dollar higher each year, who gives a fair price every time—it's all clear at a glance. This is also the best thing to use when negotiating—no need to guess, just directly ask, 'Why are you one dollar fifty higher than the others?'

Thirdly, there is now a scale for abnormal fluctuations. Should we be worried if it rises by 5%? Has it bottomed out if it drops by 8%? With a twelve-month benchmark, these questions now have a reference.

The only cost of this table is ten minutes each month.

Four situations, four actions

Turn the stages into actions; the table below can be used directly.

Market phaseRecommended actionDon't do anything
StableProcure at a normal pace and focus on the accuracy of usage forecastsDo not make directional judgments
Early stage of上涨 and low inventoryModerately lock in quantities one to two months in advance, prioritizing supply securitySingle-use lock for more than six months
Rising rapidly, with a large increaseMaintain the regular amount; it's better to pay more than to stop the supply.Panic buying and temporarily switching suppliers
Downlink channelProcure on demand, shorten the ordering cycle, and let prices automatically updateRepeatedly guessing the bottom and continuously adding to positions

The core logic behind this table

Actually, there's only one sentence: buy supply security when costs are high, and buy price advantage when costs are low.

During an uptrend, what you are buying is continuous supply, and this value is usually higher than the extra money paid; during a downtrend, what you are buying is the time difference, using short-term orders to let the price automatically move down, which is easier and safer than cutting the price all at once.

The point that is most easily misunderstood

Some people might ask: So are you saying we should stock up or not?

The answer is: Stockpile according to usage, not according to market trends.

Increasing inventory is only reasonable when both of the following conditions are met: 'my usage for the next three months is very certain' and 'there is a risk of supply disruption.' Note that the market situation is not a variable here.

5. Four more practical tactics

First, build positions in batches rather than making a one-time decision

Divide the usage for the next three months into three to four batches, and place orders weekly or every ten days.

The benefits of doing this: you automatically obtain the average cost, won't regret investing at the highest point, and won't be anxious about missing out.

For most people, this move can reduce cost fluctuations more than any market judgment.

Secondly, use 'quantity' to exchange for 'security', rather than using 'price' to bet on 'timing'

It's difficult to talk about the expected price, so switch to discussing something else: supply guarantee priority, capacity reservation for peak season, and short-term price adjustment mechanisms.

These things are worth much more than a few hundred yuan when the market is tight.

Third, change the pricing terms to a linkage mechanism

Include the previous set of linkage clauses in the annual agreement. With the mechanism in place, you don't need to judge the market; the market will transmit itself through the clauses.

This is turning 'human judgment' into 'rule-based judgment,' which is the most worry-free approach in the long run.

Fourth, keep Article 11: Information Channels

Spend some time establishing two or three reliable sources of information: weekly reports from industry news agencies, public announcements from upstream companies, and quotes from reliable spot market channels.

With regular information, you don't need to scramble for news when the market moves. Most poor decisions are the result of information anxiety.

Six monthly reviews

Turning market response from 'temporary decision-making' into 'routine procedure' relies on this table. It is recommended to set aside a half day each month for procurement, finance, and planning to go through it together.

First, how much does the actual delivery volume this month differ from last month's forecast, and where is the difference?

Secondly, the positional relationship between this month's average purchase price and the self-recorded curve

Third, whether the inventory turnover days have exceeded the target

Fourth, are there any high-value part numbers that need to be re-quoted?

Fifth, are there any known large fluctuations in next month's volume (project introduction, model discontinuation)?

Sixth, are there any new change notices or price increase letters from the supplier side?

Once these six items are completed, next month's purchasing actions will basically be clear.

Interestingly, after doing this review, most people will find that the time they spend 'guessing the market' is significantly reduced. This is because most decisions become data-driven, eliminating the need to watch the market in real time to make judgments.

Six, Three Red Lines

Finally, here’s a set of things you should never do, no matter what the market is like:

Red Line 1: Do not change key component materials temporarily because of the price

This point has been repeatedly emphasized earlier. Especially, do not switch when the market is tight — at that time, the choice of suppliers may also be more rushed, and the verification time is also compressed.

Red Line 2: Do not let inventory exceed your own capacity to handle it

The safety margin of inventory is not about funds, but whether it can be used up within a reasonable time.

Inventory that has not found a use for more than three months has essentially become a burden rather than an asset.

Red Line Three: Do not engage in trades you do not understand

Forwards, warehouse receipts, cross-variety arbitrage... these things also occasionally appear in the plastics industry.

The principle is very simple: if you can't explain this valuable mechanism to finance within three minutes, then don't participate.

Don't forget the cash flow side

When the market fluctuates violently, it is often not judgment that is easily overwhelmed, but cash flow.

During periods of rising prices, you have to pay more for the same quantity; during periods of falling prices, the inventory you hold can devalue overnight. Both directions are draining your funds.

It is recommended to schedule two things with the finance department in advance:

First, an emergency budget for market movements. For example, in addition to the usual monthly purchase amount, set aside an extra 10% temporary purchase budget, specifically for locking in quantities in advance when the market fluctuates drastically. Having this budget gives you the confidence to 'purchase in advance' moderately, without having to wait for approval every time.

Secondly, the rules for switching between promissory notes and cash. During a rising period, suppliers prefer to receive cash (they also want it quickly), while during a falling period, promissory notes are easier to negotiate. This point can be discussed together with the price linkage clause, making it a very good bundling item.

About the mindset of 'waiting a moment'

The most uncomfortable part of a market upswing isn't spending more money, it's that sense of urgency of 'if I don't buy now, I won't be able to get it.'

At times like this, remind yourself of one thing: your end customers are giving you long-term orders, not futures contracts.

Having orders in hand, being three days late won't lose business; buying too expensive or buying the wrong thing is what really loses money. The most common regrets I've seen in the past two years aren't about spending too much, but about messing up supplier relationships and verification processes in a panic.

When the market is declining, don't just focus on lowering prices. During the low-price period of modified nylon, locking in long-term orders and stocking up is often more cost-effective than buying rush goods during an uptrend.

A gathering phrase

Finally, to conclude: the quality of material selection communication depends on how realistically the requirements are written—if the working conditions are described realistically, the modified nylon solution will be more than half correct.

Conclusion

Regarding market trends, I am increasingly inclined towards a simple view: in the profession of procurement, the benefits of accurate judgment are usually smaller than the certainty brought by taking the correct actions.

If you make the right judgment, you might save a few percent in a year; if you make the wrong judgment, you might lose half of the profits at once and also compromise supply security.

So what is actually more worth investing in are the fundamentals that are not affected by market conditions: the accuracy of usage forecasts, the completeness of contract terms, the preparation of alternative sources, and the diversification of usage structure.

I have organized this set of four-stage action lists, the phased position-building rhythm chart, and those three red lines into a decision table:

Before pouring the material into the machine, all the things that could be decided have actually already been covered in this series: which material to choose, how to inspect it, and how to handle problems.

What has really left an impression on me over the years are the few clients who were the quietest on the phone during the year when the market was at its peak—they didn’t gamble, nor did they panic, they just kept the pace steady.

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