---
title: "Kester Solder — $298K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/kester-solder"
last_updated: "2026-08-09T07:52:33.202Z"
locale: en
meta:
description: "Niche score 46/100 · $298K/yr market · 124K searches/yr · $24.23 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 46/100 · $298K/yr market · 124K searches/yr · $24.23 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Kester Solder — $298K/yr Amazon US Niche (2026) - Flapen"
---
# **kester solder**
**Skip it**
Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Market size 51Growth 24Conversion 87Competition 30Returns 97Price range 77Avg price 95Brand share 0Review moat 25Quality gap 18
**Returns**
**Incredible****0.7%**
return rate — above 5% kills the launch gate
**Avg price**
**Incredible****$24.23**
avg listing price — sweet spot $15–$100
**Conversion**
**Great****9.9%**
search→purchase rate — share of searches ending in a sale
**Price range**
**Great****$5.05–$49.05**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Good****$298K**
$298K/yr · 124K searches
**Competition**
**Okay****67%**
top-5 click share — leaders hold, buyers still browse
**Review moat**
**Bad****4,878.18**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Bad****-2.6%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, kester solder is a $298K/yr Amazon United States market (124K searches/yr). The top 5 brands hold 100% of demand. Verdict: Skip it — 46/100.
Data updated Jul 30, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **kester solder market data**
- **Units sold / yr**
- **10K–13K**
- avg 500–750/product
- **Revenue / yr**
- **$242K–$303K**
- units × avg price
- **Conversion rate**
- **9.9%**
- **Avg BSR**
- **#78**
- **Page quality**
- **0%**
- **Prime**
- **94%**
- **Sponsored**
- **41%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **50 months**
- **Avg seller age**
- **175 days**
## **Competition & brand share**
The top 5 products take 67% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**5 **▼falling
**Sellers**
**24**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**67%**
Top 20: 100%
**Open market**
**0%**
- Kester65% - MAIYUM19% - TOWOT8% - HengTianMei6% - twocorn2% - Open — no brand owns it (0%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -2.6% search growth over the last 90 days.
4K3KSpike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.7×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/kester-solder/trend)
## **Top kester solder search terms**
- **kester solder**34K/yr-10.7%6.0% conv. - **63/37 rosin core solder**13K/yr+11.1%10.3% conv. - **kester solder 63/37**15K/yr+3.6%10.1% conv. - **63/37 solder**13K/yr+4.4%8.8% conv. - **kester 44**13K/yr-9.4%8.7% conv. - **kester**6K/yr-5.7%2.7% conv. - **kester 44 rosin core solder**5K/yr+5.3%13.5% conv. - **kester 63/37**4K/yr+5.7%10.1% conv. - **63/37 leaded solder**3K/yr+61.1%15.0% conv. - **solder 63/37**4K/yr+0.5%10.8% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/kester-solder/search-terms)
## **Top kester solder products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%10%$30K20%$60K30%$89K40%$119K1101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 17 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Kester 44 Solder Wire 63/37 0.031 RMA Rosin 1-ounce Tube**Kester**$13.34**4.8★738 rev](https://www.amazon.com/dp/B00AVLM4SO) [2**MAIYUM 63-37 Tin Lead Rosin Core Solder Wire for Electrical Soldering (0.8mm 50g)**MAIYUM**$8.53**4.6★22,279 rev](https://www.amazon.com/dp/B075WB98FJ) [3**KESTER SOLDER 24-6040-0027 Wire Solder 0.031Dia. Pack of (1) 32117**Kester**$44.47**4.9★2,698 rev](https://www.amazon.com/dp/B00068IJPO) [4**KESTER SOLDER 24-6337-0027 Solder Wire 63/37 SN/PB 183C 1LB (1) (1)**Kester**$45.20**4.9★247 rev](https://www.amazon.com/dp/B00DE2QVIG) [5**TOWOT 63-37 High Purity Tin Lead Rosin Core Solder Wire for Electrical Soldering Content 1.8% Solder Flux (1.0mm 50g)**TOWOT**$6.68**4.7★5,396 rev](https://www.amazon.com/dp/B09KM2LW4G)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Kester 44 Solder Wire 60/40 0.025 RMA Rosin 3/4-ounce Tube**Kester**$13.21**8 rev5mo ago](https://www.amazon.com/dp/B0FMYRPD79) [**Twocorn 63/37 Solder Wire high Purity no-wash tin-Lead Rosin cored Wire with 1.8% Flux for Electric Soldering (0.8mm 50g)**twocorn**$5.05**948 rev2y ago](https://www.amazon.com/dp/B0CP7QHFL6) [**TOWOT 63-37 High Purity Tin Lead Rosin Core Solder Wire for Electrical Soldering Content 1.8% Solder Flux (1.0mm 50g)**TOWOT**$6.68**5,396 rev4y ago](https://www.amazon.com/dp/B09KM2LW4G) [**HengTianMei 63/37 Rosin Core Tin Lead Solder Wire For Electrical Soldering(0.3mm/50g)**HengTianMei**$8.76**1,391 rev5y ago](https://www.amazon.com/dp/B08M5XDKFG) [**HengTianMei Tin Lead 63/37 Rosin Core Low Temp Solder Wire For Electronics Components And DIY repair(0.8mm/50g)**HengTianMei**$8.80**1,391 rev5y ago](https://www.amazon.com/dp/B08M5YP6BN)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Kester 44 Solder Wire 60/40 0.025 RMA Rosin 3/4-ounce Tube**Kester**$13.21**4.2★**▲ 200%**](https://www.amazon.com/dp/B0FMYRPD79) [**MAIYUM 63-37 Tin Lead Rosin Core Solder Wire for Electrical Soldering (0.6mm 50g)**MAIYUM**$8.60**4.6★**▲ 47%**](https://www.amazon.com/dp/B075WBDYZZ) [**KESTER SOLDER 24-6337-0027 Solder Wire 63/37 SN/PB 183C 1LB (1) (1)**Kester**$45.20**4.9★**▲ 46%**](https://www.amazon.com/dp/B00DE2QVIG) [**MAIYUM 63-37 Tin Lead Rosin Core Solder Wire for Electrical Soldering (0.8mm 50g)**MAIYUM**$8.53**4.6★**▲ 30%**](https://www.amazon.com/dp/B075WB98FJ) [**Kester 24-6337-0027 Solder Roll Core Size 66 63/37 Alloy 0.031 Diameter**Kester**$44.77**4.9★**▲ 22%**](https://www.amazon.com/dp/B0149K4JTY)
**~~View all trending →~~**
## **What buyers say about kester solder**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**30%
*“Excellent quality”*
**Advertised Vs Actual Product**15%
*“It is as described”*
**Value For Money**13%
*“Worth it”*
**Ease Of Use**8%
*“Easy to use”*
**Spray/Flow**4%
*“Flows good”*
**Heating**3%
*“Happy with how it melted quickly”*
**Size-Overall**3%
*“Right stuff, right size”*
**Functionality-Overall**3%
*“Works very well for electronics soldering”*
**Durability**3%
*“the long term use has always given me great results”*
**Connectivity-Overall**3%
*“Connections are solid”*
### **What buyers complain about **
**Quality-Overall**27%
*“Poor quality control”*
**Functionality-Overall**13%
*“It doesn't work well either”*
**Ease Of Use**8%
*“extremely difficult to operate”*
**Spray/Flow**8%
*“Doesnt flow well”*
**Heating**7%
*“The melting temperature fluctuates wildly”*
**Value For Money**5%
*“Too expensive now”*
**Thickness**4%
*“needs to be twice as thick”*
**Size-Overall**4%
*“It doesn't conform to my nickel strip”*
**Adhesion/Stickiness**3%
*“does not stick wel”*
**Advertised Vs Actual Product**2%
*“This is false advertising”*
### **Top return reasons **
**Size-Overall**28%
**Value For Money**13%
**Advertised Vs Actual Product**12%
**Thin**9%
**Functionality-Overall**8%
**Defective Material/Parts**5%
**Adhesion/Stickiness**3%
**Thickness**3%
**Heating**3%
**Quality-Overall**2%
## **Common questions**
- **Is kester solder profitable to sell on Amazon United States?**
- The niche generates $298K/yr across 17 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -2.6%. Flapen's verdict: Skip it (46/100).
- **How competitive is the kester solder niche?**
- 5 brands and 24 sellers compete. The top 5 products take 67% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in kester solder?**
- Top complaints mined from reviews: Quality-Overall, Functionality-Overall, Ease Of Use. The return rate is 0.7%.
- **When does demand for kester solder peak?**
- Demand is steady year-round — the busiest month runs 1.7× the quietest.
- **What does it cost to enter the kester solder niche?**
- Listings span $5.05–$49.05; the average listing price is $24.23 (sweet spot $15–$100). The average incumbent carries 4,878 reviews — the moat a new listing must climb.
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