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65

耐水ペーパー 800

Worth a look

Shows low returns (0.3%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 67Growth 63Conversion 93Competition 55Returns 99Price range 0Avg price 0Brand share 65Review moat 79Quality gap 75

Returns

Incredible0.3%

return rate — above 5% kills the launch gate

Conversion

Great11.6%

search→purchase rate — share of searches ending in a sale

Review moat

Great421.19

avg incumbent reviews — the moat a new listing must climb

Quality gap

Great4.3★

avg incumbent rating — lower means beatable quality

Market size

Good¥661K

¥661K/yr · 11K searches

Brand share

Good66%

top-5 brand share — brands hold most of the demand

Growth

Good+40.6%

90-day search growth — must beat 0% to launch

Competition

Good52%

top-5 click share — leaders hold, buyers still browse

Avg price

Bad¥535.50

avg listing price — sweet spot $15–$100

Price range

Bad¥122.36–¥832.06

cheapest to priciest tracked listing — scored on the share inside $15–$100

According to Flapen's Amazon Japan niche tracking, 耐水ペーパー 800 is a ¥661K/yr Amazon Japan market (11K searches/yr). The top 5 brands hold 66% of demand. Verdict: Worth a look — 65/100.

Data updated Jul 30, 2026 · scored weekly · How we score niches

耐水ペーパー 800 market data

Units sold / yr
1K–1K
avg 0–100/product
Revenue / yr
¥536K–¥669K
units × avg price
Conversion rate
11.6%
Avg BSR
#72
Page quality
0%
Prime
90%
Sponsored
57%
Out of stock
8.0%
Avg brand age
79 months
Avg seller age
195 days

Competition & brand share

The top 5 products take 52% of clicks — established leaders, but buyers still shop beyond them.

Brands

14 flat

Sellers

37

Top-5 brand share

66%

Top 20: 100%

Top-5 click share

52%

Top 20: 99%

Open market

28%

  • MORLARCO23%
  • BODHTAT19%
  • トラスコ中山(TRUSCO)9%
  • IROKCAKPT8%
  • Hbitsae7%
  • GSI クレオス(GSI Creos)7%

Demand

Weekly Amazon search volume, last 19 weeks — +40.6% search growth over the last 90 days.
350250Spike '26Prime Day '26Mar '26Apr '26May '26May '26Jun '26Jul '26

Top 耐水ペーパー 800 search terms

  • 耐水ペーパー 800番5K/yr
  • 800番 ペーパー2K/yr
  • 耐水ペーパー 8003K/yr
All search terms

Top 耐水ペーパー 800 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%¥66K20%¥132K30%¥198K40%¥264K1101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted

All 21 tracked products in this niche — three views at once, no toggling.

What buyers say about 耐水ペーパー 800

What buyers praise and complain about, mined from review topics.

What buyers love

コストパフォーマンス24%

“コスパイイです。”

使用の容易さ18%

“便利”

総合品質15%

“使い勝手は不満ないですが”

水に強い5%

“万能耐水ペーパー”

地元製造5%

“三共理化学は日本製で、信頼の会社です。”

耐久性4%

“耐久性も十分。”

ペイントの品質4%

“塗装後の研磨に最適でした。”

サイズ全体3%

“ベストサイズ”

正しい内容3%

“数も入っているのでとても良いです”

機能全体3%

“今までホームセンターなどで購入していたものとDIYレベルなら遜色なく普通に使えました。”

What buyers complain about

コストパフォーマンス21%

“安いので不安でしたが”

水に強い13%

“耐水ではない”

サイズ全体13%

“一枚が結構大きくて枚数も番手もたくさんあって”

総合品質8%

“安い”

耐久性4%

“耐久性が低い”

生锈/腐食する4%

“磨いたり錆を取ったりしてます”

ジャミング/詰まり4%

“目詰まりしているわけでもなく削れなくなります。”

使用の容易さ3%

“出しにくい”

組み立て/インストール2%

“種類を揃えるのも面倒だけれど”

Top return reasons

サイズ全体50%
総合品質25%
水に強い25%

Common questions

Is 耐水ペーパー 800 profitable to sell on Amazon Japan?
The niche generates ¥661K/yr across 21 tracked products. 3 of 5 products launched in the last 360 days are still selling. 90-day search growth is +40.6%. Flapen's verdict: Worth a look (65/100).
How competitive is the 耐水ペーパー 800 niche?
14 brands and 37 sellers compete. The top 5 products take 52% of clicks and top 5 brands hold 66% of demand.
What do buyers complain about in 耐水ペーパー 800?
Top complaints mined from reviews: コストパフォーマンス, 水に強い, サイズ全体. The return rate is 0.3%.
What does it cost to enter the 耐水ペーパー 800 niche?
Listings span ¥122.36–¥832.06; the average listing price is ¥535.50 (sweet spot $15–$100). The average incumbent carries 421 reviews — the moat a new listing must climb.